TMS3320C5515 DSP System
User's Guide
Literature Number: SPRUFX5A
October 2010–Revised November 2010
Contents
Preface ....................................................................................................................................... 9
1
System Control ................................................................................................................. 13
1.1
Introduction ................................................................................................................. 13
1.1.1 Block Diagram .................................................................................................... 13
1.1.2 CPU Core .......................................................................................................... 14
1.1.3 FFT Hardware Accelerator ...................................................................................... 14
1.1.4 Power Management .............................................................................................. 15
1.1.5 Peripherals ........................................................................................................ 15
System Memory ........................................................................................................... 16
1.2.1 Program/Data Memory Map ..................................................................................... 16
1.2.2 I/O Memory Map .................................................................................................. 20
Device Clocking ............................................................................................................ 20
1.3.1 Overview ........................................................................................................... 20
1.3.2 Clock Domains .................................................................................................... 23
System Clock Generator ................................................................................................. 23
1.4.1 Overview ........................................................................................................... 23
1.4.2 Functional Description ........................................................................................... 24
1.4.3 Configuration ...................................................................................................... 26
1.4.4 Clock Generator Registers ...................................................................................... 29
Power Management ....................................................................................................... 33
1.5.1 Overview ........................................................................................................... 33
1.5.2 Power Domains ................................................................................................... 33
1.5.3 Clock Management ............................................................................................... 34
1.5.4 Static Power Management ...................................................................................... 46
1.5.5 Power Configurations ............................................................................................ 50
Interrupts .................................................................................................................... 53
1.6.1 IFR and IER Registers ........................................................................................... 54
1.6.2 Interrupt Timing ................................................................................................... 55
1.6.3 Timer Interrupt Aggregation Flag Register (TIAFR) [1C14h] ............................................... 56
1.6.4 GPIO Interrupt Enable and Aggregation Flag Registers .................................................... 56
1.6.5 DMA Interrupt Enable and Aggregation Flag Registers ..................................................... 56
System Configuration and Control ...................................................................................... 57
1.7.1 Overview ........................................................................................................... 57
1.7.2 Device Identification .............................................................................................. 57
1.7.3 Device Configuration ............................................................................................. 61
1.7.4 DMA Controller Configuration ................................................................................... 70
1.7.5 Peripheral Reset .................................................................................................. 73
1.7.6 EMIF and USB Byte Access .................................................................................... 75
1.7.7 EMIF Clock Divider Register (ECDR) [1C26h] ............................................................... 77
1.2
1.3
1.4
1.5
1.6
1.7
3
SPRUFX5A–October 2010–Revised November 2010
Contents
Copyright © 2010, Texas Instruments Incorporated
List of Figures
1-1. Functional Block Diagram ................................................................................................ 13
1-2. DSP Memory Map ........................................................................................................ 17
1-3. DSP Clocking Diagram .................................................................................................. 22
1-4. Clock Generator ........................................................................................................... 24
1-5. CLKOUT Control Source Select Register (CCSSR) [1C24h]........................................................ 25
1-6. Clock Generator Control Register 1 (CGCR1) [1C20h] .............................................................. 30
1-7. Clock Generator Control Register 2 (CGCR2) [1C21h] .............................................................. 30
1-8. Clock Generator Control Register 3 (CGCR3) [1C22h] .............................................................. 31
1-9. Clock Generator Control Register 4 (CGCR4) [1C23h] .............................................................. 31
1-10. Clock Configuration Register 1 (CCR1) [1C1Eh]...................................................................... 32
1-11. Clock Configuration Register 2 (CCR2) [1C1Fh]...................................................................... 32
1-12. Idle Configuration Register (ICR) [0001h].............................................................................. 36
1-13. Idle Status Register (ISTR) [0002h]..................................................................................... 37
1-14. Peripheral Clock Gating Configuration Register 1 (PCGCR1) [1C02h] ............................................ 39
1-15. Peripheral Clock Gating Configuration Register 2 (PCGCR2) [1C03h] ............................................ 41
1-16. Peripheral Clock Stop Request/Acknowledge Register (CLKSTOP) [1C3Ah] .................................... 42
1-17. USB System Control Register (USBSCR) [1C32h] ................................................................... 44
1-18. RTC Power Management Register (RTCPMGT) [1930h]............................................................ 46
1-19. RTC Interrupt Flag Register (RTCINTFL) [1920h] .................................................................... 47
1-20. RAM Sleep Mode Control Register1 [0x1C28] ........................................................................ 48
1-21. RAM Sleep Mode Control Register2 [0x1C2A] ........................................................................ 49
1-22. RAM Sleep Mode Control Register3 [0x1C2B] ........................................................................ 49
1-23. RAM Sleep Mode Control Register4 [0x1C2C]........................................................................ 49
1-24. RAM Sleep Mode Control Register5 [0x1C2D]........................................................................ 49
1-25. IFR0 and IER0 Bit Locations............................................................................................. 54
1-26. IFR1 and IER1 Bit Locations............................................................................................. 55
1-27. Die ID Register 0 (DIEIDR0) [1C40h]................................................................................... 58
1-28. Die ID Register 1 (DIEIDR1) [1C41h]................................................................................... 58
1-29. Die ID Register 2 (DIEIDR2) [1C42h]................................................................................... 58
1-30. Die ID Register 3 (DIEIDR3[15:0]) [1C43h] ............................................................................ 59
1-31. Die ID Register 4 (DIEIDR4) [1C44h]................................................................................... 59
1-32. Die ID Register 5 (DIEIDR5) [1C45h]................................................................................... 59
1-33. Die ID Register 6 (DIEIDR6) [1C46h]................................................................................... 60
1-34. Die ID Register 7 (DIEIDR7) [1C47h]................................................................................... 60
1-35. External Bus Selection Register (EBSR) [1C00h]..................................................................... 61
1-36. RTC Power Management Register (RTCPMGT) [1930h]............................................................ 63
1-37. LDO Control Register (LDOCNTL) [7004h] ............................................................................ 65
1-38. Output Slew Rate Control Register (OSRCR) [1C16h]............................................................... 66
1-39. Pull-Down Inhibit Register 1 (PDINHIBR1) [1C17h] .................................................................. 67
1-40. Pull-Down Inhibit Register 2 (PDINHIBR2) [1C18h] .................................................................. 68
1-41. Pull-Down Inhibit Register 3 (PDINHIBR3) [1C19h] .................................................................. 69
1-42. DMA Interrupt Flag Register (DMAIFR) [1C30h] ...................................................................... 72
1-43. DMA Interrupt Enable Register (DMAIER) [1C31h]................................................................... 72
1-44. DMAn Channel Event Source Register 1 (DMAnCESR1) [1C1Ah, 1C1Ch, 1C36h, and 1C38h] .............. 73
1-45. DMAn Channel Event Source Register 2 (DMAnCESR2) [1C1Bh, 1C1Dh, 1C37h, and 1C39h] .............. 73
1-46. Peripheral Software Reset Counter Register (PSRCR) [1C04h].................................................... 74
1-47. Peripheral Reset Control Register (PRCR) [1C05h] .................................................................. 74
4
List of Figures
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
1-48. EMIF System Control Register (ESCR) [1C33h] ...................................................................... 76
1-49. EMIF Clock Divider Register (ECDR) [1C26h] ........................................................................ 77
5
SPRUFX5A–October 2010–Revised November 2010
List of Figures
Copyright © 2010, Texas Instruments Incorporated
List of Tables
............................................................................................................................... 14
1-1.
1-2. DARAM Blocks ............................................................................................................ 17
1-3. SARAM Blocks............................................................................................................. 18
1-4. SAROM Blocks ............................................................................................................ 19
1-5. PLL Output Frequency Configuration................................................................................... 24
1-6. CLKOUT Control Source Select Register (CCSSR) Field Descriptions............................................ 25
1-7. Clock Generator Control Register Bits Used In BYPASS MODE................................................... 27
1-8. Output Frequency in Bypass Mode ..................................................................................... 27
1-9. Clock Generator Control Register Bits Used In PLL Mode .......................................................... 27
1-10. PLL Clock Frequency Ranges ........................................................................................... 28
1-11. Examples of Selecting a PLL MODE Frequency, When CLK_SEL=L ............................................. 29
1-12. Clock Generator Registers ............................................................................................... 29
1-13. Clock Generator Control Register 1 (CGCR1) Field Descriptions .................................................. 30
1-14. Clock Generator Control Register 2 (CGCR2) Field Descriptions .................................................. 30
1-15. Clock Generator Control Register 3 (CGCR3) Field Descriptions .................................................. 31
1-16. Clock Generator Control Register 4 (CGCR4) Field Descriptions .................................................. 31
1-17. Clock Configuration Register 1 (CCR1) Field Descriptions .......................................................... 32
1-18. Clock Configuration Register 2 (CCR2) Field Descriptions .......................................................... 32
1-19. Power Management Features ........................................................................................... 33
1-20. DSP Power Domains...................................................................................................... 34
1-21. Idle Configuration Register (ICR) Field Descriptions ................................................................. 36
1-22. Idle Status Register (ISTR) Field Descriptions ........................................................................ 37
1-23. CPU Clock Domain Idle Requirements................................................................................. 37
1-24. Peripheral Clock Gating Configuration Register 1 (PCGCR1) Field Descriptions ................................ 39
1-25. Peripheral Clock Gating Configuration Register 2 (PCGCR2) Field Descriptions ................................ 41
1-26. Peripheral Clock Stop Request/Acknowledge Register (CLKSTOP) Field Descriptions......................... 42
1-27. USB System Control Register (USBSCR) Field Descriptions ....................................................... 44
1-28. RTC Power Management Register (RTCPMGT) Field Descriptions ............................................... 46
1-29. RTC Interrupt Flag Register (RTCINTFL) Field Descriptions........................................................ 47
1-30. On-Chip Memory Standby Modes....................................................................................... 48
1-31. Power Configurations ..................................................................................................... 50
1-32. Interrupt Table ............................................................................................................. 53
1-33. IFR0 and IER0 Bit Descriptions ......................................................................................... 54
1-34. IFR1 and IER1 Bit Descriptions ......................................................................................... 55
1-35. Die ID Registers ........................................................................................................... 57
1-36. Die ID Register 0 (DIEIDR0) Field Descriptions....................................................................... 58
1-37. Die ID Register 1 (DIEIDR1) Field Descriptions....................................................................... 58
1-38. Die ID Register 2 (DIEIDR2) Field Descriptions....................................................................... 58
1-39. Die ID Register 3 (DIEIDR3[15:0]) Field Descriptions ................................................................ 59
1-40. Die ID Register 4 (DIEIDR4) Field Descriptions....................................................................... 59
1-41. Die ID Register 5 (DIEIDR5) Field Descriptions....................................................................... 59
1-42. Die ID Register 6 (DIEIDR6) Field Descriptions....................................................................... 60
1-43. Die ID Register 7 (DIEIDR7) Field Descriptions....................................................................... 60
1-44. EBSR Register Bit Descriptions Field Descriptions................................................................... 62
1-45. RTCPMGT Register Bit Descriptions Field Descriptions............................................................. 64
1-46. LDOCNTL Register Bit Descriptions Field Descriptions.............................................................. 65
1-47. LDO Controls Matrix ...................................................................................................... 65
6
List of Tables
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
1-48. Output Slew Rate Control Register (OSRCR) Field Descriptions................................................... 66
1-49. Pull-Down Inhibit Register 1 (PDINHIBR1) Field Descriptions ...................................................... 67
1-50. Pull-Down Inhibit Register 2 (PDINHIBR2) Field Descriptions ...................................................... 68
1-51. Pull-Down Inhibit Register 3 (PDINHIBR3) Field Descriptions ...................................................... 69
1-52. Channel Synchronization Events for DMA Controllers ............................................................... 71
1-53. System Registers Related to the DMA Controllers ................................................................... 71
1-54. DMA Interrupt Flag Register (DMAIFR) Field Descriptions .......................................................... 72
1-55. DMA Interrupt Enable Register (DMAIER) Field Descriptions....................................................... 72
1-56. DMAn Channel Event Source Register 1 (DMAnCESR1) Field Descriptions ..................................... 73
1-57. DMAn Channel Event Source Register 2 (DMAnCESR2) Field Descriptions ..................................... 73
1-58. Peripheral Software Reset Counter Register (PSRCR) Field Descriptions........................................ 74
1-59. Peripheral Reset Control Register (PRCR) Field Descriptions...................................................... 74
1-60. Effect of BYTEMODE Bits on EMIF Accesses ........................................................................ 76
1-61. Effect of USBSCR BYTEMODE Bits on USB Access ................................................................ 76
1-62. EMIF System Control Register (ESCR) Field Descriptions .......................................................... 76
1-63. EMIF Clock Divider Register (ECDR) Field Descriptions ............................................................ 77
7
SPRUFX5A–October 2010–Revised November 2010
List of Tables
Copyright © 2010, Texas Instruments Incorporated
8
List of Tables
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
Preface
SPRUFX5A–October 2010–Revised November 2010
Read This First
About This Manual
This document describes various aspects of the TMS320C5515 digital signal processor (DSP) including:
system memory, device clocking options and operation of the DSP clock generator, power management
features, interrupts, and system control.
Notational Conventions
This document uses the following conventions.
•
Hexadecimal numbers are shown with the suffix h. For example, the following number is 40
hexadecimal (decimal 64): 40h.
•
Registers in this document are shown in figures and described in tables.
–
Each register figure shows a rectangle divided into fields that represent the fields of the register.
Each field is labeled with its bit name, its beginning and ending bit numbers above, and its
read/write properties below. A legend explains the notation used for the properties.
–
Reserved bits in a register figure designate a bit that is used for future device expansion.
Related Documentation From Texas Instruments
The following documents describe the TMS320C5515/14/05/04 Digital Signal Processor (DSP) Digital
Signal Processor (DSP). Copies of these documents are available on the internet at http://www.ti.com.
registers, and operation of the fixed-point TMS320C55x digital signal processor (DSP) CPU.
functional exceptions to the CPU behavior.
SPRUFO1A — TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) Inter-Integrated
Circuit (I2C) Peripheral User's Guide. This document describes the inter-integrated circuit (I2C)
peripheral in the TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) devices. The
I2C peripheral provides an interface between the device and other devices compliant with Phillips
Semiconductors Inter-IC bus (I2C-bus) specification version 2.1 and connected by way of an
I2C-bus. This document assumes the reader is familiar with the I2C-bus specification.
SPRUFO2 — TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) Timer/Watchdog
Timer User's Guide. This document provides an overview of the three 32-bit timers in the
TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) devices. The 32-bit timers of
the device are software programmable timers that can be configured as general-purpose (GP)
timers. Timer 2 can be configured as a GP, a Watchdog (WD), or both simultaneously.
SPRUFO3 — TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) Serial Peripheral
Interface (SPI) User's Guide. This document describes the serial peripheral interface (SPI) in the
TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) devices. The SPI is a
high-speed synchronous serial input/output port that allows a serial bit stream of programmed
length (1 to 32 bits) to be shifted into and out of the device at a programmed bit-transfer rate. The
SPI supports multi-chip operation of up to four SPI slave devices. The SPI can operate as a master
device only.
9
SPRUFX5A–October 2010–Revised November 2010
Read This First
Copyright © 2010, Texas Instruments Incorporated
Related Documentation From Texas Instruments
SPRUFO4 — TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) General-Purpose
Input/Output (GPIO) User's Guide. This document describes the general-purpose input/output
(GPIO) on the TMS320C5515/14/05/04/VC05/VC04 digital signal processor (DSP) devices. The
GPIO peripheral provides dedicated general-purpose pins that can be configured as either inputs or
outputs. When configured as an input, you can detect the state of an internal register. When
configured as an output you can write to an internal register to control the state driven on the output
pin.
SPRUFO5 — TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) Universal
Asynchronous Receiver/Transmitter (UART) User's Guide. This document describes the
universal asynchronous receiver/transmitter (UART) peripheral in the
TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) devices. The UART performs
serial-to-parallel conversions on data received from a peripheral device and parallel-to-serial
conversion on data received from the CPU.
SPRUFP1 — TMS320C5515/05/VC05 Digital Signal Processor (DSP) Successive Approximation
(SAR) Analog to Digital Converter (ADC) User's Guide. This document provides an overview of
the Successive Approximation (SAR) Analog to Digital Converter (ADC) on the
TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) devices. The SAR is a 10-bit
ADC using a switched capacitor architecture which converts an analog input signal to a digital
value.
SPRUFP3 — TMS320C5515/05/VC05 Digital Signal Processor (DSP) Liquid Crystal Display
Controller (LCDC) User's Guide. This document describes the liquid crystal display controller
(LCDC) in the TMS320C5515/14/05/04/VC05/VC04 Digital Signal Processor (DSP) devices. The
LCD controller includes a LCD Interface Display Driver (LIDD) controller.
document describes the features and operation of the DMA controller that is available on the
TMS320C5515/14/05/04 Digital Signal Processor (DSP) devices. The DMA controller is used to
move data among internal memory, external memory, and peripherals without intervention from the
CPU and in the background of CPU operation.
document describes the operation of the external memory interface (EMIF) in the
TMS320C5515/14/05/04 Digital Signal Processor (DSP) devices. The purpose of the EMIF is to
provide a means to connect to a variety of external devices.
SPRUFO6— TMS320C5515/14/05/04/VC05/VC04 DSP Multimedia Card (MMC)/Secure Digital (SD)
Card Controller This document describes the Multimedia Card (MMC)/Secure Digital (SD) Card
Controller on the TMS320C5515/14/05/04 Digital Signal Processor (DSP) devices. The multimedia
card (MMC)/secure digital (SD) card is used in a number of applications to provide removable data
storage. The MMC/SD card controller provides an interface to external MMC and SD cards.
SPRUFX2— TMS320C5515/14/05/04 Digital Signal Processor (DSP) Real-Time Clock (RTC) User's
Guide.This document describes the operation of the Real-Time Clock (RTC) module in the
TMS320C5515/14/05/04 Digital Signal Processor (DSP) devices. The RTC also has the capability
to wake-up the power management and apply power to the rest of the device through an alarm,
periodic interrupt, or external WAKEUP signal.
SPRUFX4— TMS320C5515/14/05/04 Digital Signal Processor (DSP) Inter-IC Sound (I2S) Bus User's
Guide. This document describes the features and operation of Inter-IC Sound (I2S) Bus in the
TMS320C5515/14/05/04 Digital Signal Processor (DSP) devices. This peripheral allows serial
transfer of full duplex streaming data, usually streaming audio, between DSP and an external I2S
peripheral device such as an audio codec.
TMS320C5515 digital signal processor (DSP) including: system memory, device clocking options
and operation of the DSP clock generator, power management features, interrupts, and system
control.
10
Read This First
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
Related Documentation From Texas Instruments
the TMS320C5505 digital signal processor (DSP) including: system memory, device clocking
options and operation of the DSP clock generator, power management features, interrupts, and
system control.
TMS320C5514 digital signal processor (DSP) including: system memory, device clocking options
and operation of the DSP clock generator, power management features, interrupts, and system
control.
TMS320C5504 digital signal processor (DSP) including: system memory, device clocking options
and operation of the DSP clock generator, power management features, interrupts, and system
control.
document describes the universal serial bus 2.0 (USB) in the TMS320C5515 Digital Signal
Processor (DSP) devices. The USB controller supports data throughput rates up to 480 Mbps. It
provides a mechanism for data transfer between USB devices.
SPRABB6— FFT Implementation on the TMS320VC5505, TMS320C5505, and TMS320C5515 DSPs
This document describes FFT computation on the TMS320VC5505 and TMS320C5505/15 DSPs
devices.
11
SPRUFX5A–October 2010–Revised November 2010
Read This First
Copyright © 2010, Texas Instruments Incorporated
12
Read This First
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
Chapter 1
SPRUFX5A–October 2010–Revised November 2010
System Control
1.1 Introduction
The TMS320C5515 digital signal processor (DSP) contains a high-performance, low-power DSP to
efficiently handle tasks required by portable audio, wireless audio devices, industrial controls, software
defined radio, fingerprint biometrics, and medical applications. The C5515 DSP consists of the following
primary components:
•
•
•
•
•
A C55x CPU and associated memory
FFT hardware accelerator
Four DMA controllers and external memory interface
Power management module
A set of I/O peripherals that includes I2S, I2C, SPI, UART, Timers, EMIF, 10-bit SAR ADC, LCD
Controller, USB 2.0
For more information on these components see the following documents:
•
•
1.1.1 Block Diagram
Figure 1-1. Functional Block Diagram
DSP System
C55x™ DSP CPU
JTAG Interface
FFT Hardware
Accelerator
Input
Clock(s)
PLL/Clock
Generator
64 KB DARAM
256 KB SARAM
128 KB ROM
Power
Management
Pin
Multiplexing
Switched Central Resource (SCR)
Peripherals
Interconnect
Program/Data Storage
Serial Interfaces
I2S
(x4)
DMA
(x4)
NAND, NOR,
SRAM, mSDRAM
MMC/SD
(x2)
I2C
SPI
UART
App-Spec
Display
Connectivity
System
USB 2.0
PHY (HS)
[DEVICE]
10-Bit
SAR
ADC
LCD
Bridge
GP Timer
(x2)
GP Timer
or WD
LDOs
RTC
13
SPRUFX5A–October 2010–Revised November 2010
System Control
Copyright © 2010, Texas Instruments Incorporated
Introduction
1.1.2 CPU Core
The C55x CPU is responsible for performing the digital signal processing tasks required by the
application. In addition, the CPU acts as the overall system controller, responsible for handling many
system functions such as system-level initialization, configuration, user interface, user command
execution, connectivity functions, and overall system control.
Tightly coupled to the CPU are the following components:
•
DSP internal memories
–
–
–
Dual-access RAM (DARAM)
Single-access RAM (SARAM)
Read-only memory (ROM)
•
•
FFT hardware accelerator
Ports and buses
The CPU also manages/controls all peripherals on the device. Refer to the device-specific data manual for
the full list of peripherals.
Figure 1-1 shows the functional block diagram of the DSP and how it connects to the rest of the device.
The DSP architecture uses the switched central resource (SCR) to transfer data within the system.
1.1.3 FFT Hardware Accelerator
The C55x CPU includes a tightly-coupled FFT hardware accelerator that communicates with the C55x
CPU through the use coprocessor instructions. For ease of use, the ROM has a set of C-callable routines
that use these coprocessor instructions to perform 8, 16, 32, 64, 128, or 256-point FFTs. The main
features of the FFT hardware accelerator are:
•
•
Support for 8 to 1024-point (in powers of 2) real and complex-valued FFTs and IFFTs.
An internal twiddle factor generator for optimal use of memory bandwidth and more efficient
programming.
•
•
Basic and software-driven auto-scaling feature provides good precision vs cycle count trade-off.
Single-stage and double-stage modes enabling computation of one or two stages in one pass, thus
handling odd power of two FFT widths.
1.1.3.1 Using FFT Accelerator ROM routines
The C5505 includes C-callable routines in ROM to execute FFT and IFFT using the tightly coupled FFT
accelerator. The routines reside in the following address:
Table 1-1.
Address
Name
Description
Calling Convention
0x00ff6cd6
hwafft br
Vector bit-reversal
void hwafft_br( Int32 *data, Int32 *data_br, Uint16
data_len );
0x00ff6cea
0x00ff6dd9
0x00ff6f2f
hwafft 8pts
hwafft 16pts
hwafft 32pts
hwafft 64pts
hwafft 128pts
hwafft 256pts
hwafft 512pts
hwafft 1024pts
8-pt FFT/IFFT
Uint16 hwafft_8pts( Int32 *data,Int32 *scratch, Uint16
fft_flag, Uint16 scale_flag);
16-pt FFT/IFFT
32-pt FFT/IFFT
64-pt FFT/iFFT
128-pt FFT/IFFT
256-pt FFT/IFFT
512-pt FFT/iFFT
1024-pt FFT/IFFT
Uint16 hwafft_16pts( Int32 *data,Int32 *scratch, Uint16
fft_flag, Uint16 scale_flag);
Uint16 hwafft_32pts( Int32 *data,Int32 *scratch, Uint16
fft_flag, Uint16 scale_flag);
0x00ff7238
0x00ff73cd
0x00ff75de
0x00ff77dc
0x00ff7a56
Uint16 hwafft_64pts( Int32 *data,Int32 *scratch, Uint16
fft_flag, Uint16 scale_flag);
Uint16 hwafft_128pts( Int32 *data,Int32 *scratch,
Uint16 fft_flag, Uint16 scale_flag);
Uint16 hwafft_256pts( Int32 *data,Int32 *scratch,
Uint16 fft_flag, Uint16 scale_flag);
Uint16 hwafft_512pts( Int32 *data,Int32 *scratch,
Uint16 fft_flag, Uint16 scale_flag);
Uint16 hwafft_1024pts( Int32 *data,Int32 *scratch,
Uint16 fft_flag, Uint16 scale_flag);
14
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
Introduction
Note that for the FFT routines, output data is dependent on the return value (T0). If return = 0 output data
is in-place, meaning the result will overwrite the input buffer. If return =1, output data is placed in the
scratch buffer. The 32-bit input and output data consist of 16-bit real and 16-bit imaginary data. If only real
data is used, the imaginary part can be zeroed. The Scale flag determines if the butterfly output is divided
by 2 to prevent overflow at the expense of resolution. For further information on how to use these routines,
1.1.4 Power Management
Integrated into the C5515/14 DSP are the following power management features:
•
One low dropout LDO for analog portions of the device, DSP PLL (VDDA_PLL), SAR, and power
management circuits (VDDA_ANA): ANA_LDO
•
•
•
One LDO for DSP core (CVDD): DSP_LDO
One LDO for USB core and PHY (USB_VDDA1P3): USB_LDO
Idle controller with several clock domains:
–
–
–
–
–
CPU domain
Clock generator domain
Peripheral domain
USB domain
Real-time clock (RTC) domain
•
•
•
•
•
•
•
•
•
•
Independent voltage and power domains
LDOI (LDOs and Bandgap Power Supply)
Analog POR, SAR, and PLL (VDDA_ANA and VDDA_PLL
)
Real-time clock core (CVDDRTC
)
Digital core (CVDD)
USB core (USB_ VDD1P3 and USB_VDDA1P3
USB PHY and USB PLL (USB_VDDOSC, USB_VDDA3P3, and USB_VDDPLL
EMIF I/O (DVDDEMIF
RTC I/O (DVDDRTC
Rest of the I/O (DVDDIO
)
)
)
)
)
1.1.5 Peripherals
The DSP includes the following peripherals:
•
•
Four direct memory access (DMA) controllers, each with four independent channels.
One external memory interface (EMIF) with 21-bit address and 16-bit data. The EMIF has support for
mobile SDRAM and non-mobile SDRAM single-level cell (SCL) NAND with 1-bit ECC, and multi-level
cell (MLC) NAND with 4-bit ECC.
NOTE: The C5515 can support non-mobile SDRAM under certain circumstances. The C5515
always uses mobile SDRAM initialization but it is able to support SDRAM memories that
ignore the BA0 and BA1 pins for the 'load mode register' command. During the mobile
SDRAM initialization, the device issues the 'load mode register' initialization command to two
different addresses that differ in only the BA0 and BA1 address bits. These registers are the
Extended Mode register and the Mode register. The Extended mode register exists only in
mSDRAM and not in non-mSDRAM. If a non-mobile SDRAM memory ignores bits BA0 and
BA1, the second loaded register value overwrites the first, leaving the desired value in the
Mode register and the non-mobile SDRAM will work with C5515.
•
•
Two serial busses each configurable to support one Multimedia Card (MMC) / Secure Digital
(SD/SDIO) controller, one inter-IC sound bus (I2S) interface with GPIO, or a full GPIO interface.
One parallel bus configurable to support a 16-bit LCD bridge or a combination of an 8-bit LCD bridge,
a serial peripheral interface (SPI), an I2S, a universal asynchronous receiver/transmitter (UART), and
GPIO.
•
One inter-integrated circuit (I2C) multi-master and slave interface with 7-bit and 10-bit addressing
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System Memory
modes.
•
•
•
Three 32-bit timers with 16-bit prescaler; one timer supports watchdog functionality.
A USB 2.0 slave.
A 10-bit successive approximation (SAR) analog-to-digital converter with touchscreen conversion
capability.
•
One real-time clock (RTC) with associated low power mode.
1.2 System Memory
The DSP supports a unified memory map (program code sections and data sections can be mixed and
interleaved within the entire memory space) composed of both on-chip and external memory. The on-chip
memory consists of 320KB of RAM and 128KB of ROM.
The external memory interface (EMIF) port provides the means for the DSP to access external memory
and devices including: mobile and non-mobile single data rate (SDR) SDRAM, (for limitations, see note in
Section 1.1.5), NOR Flash, NAND Flash and SRAM.
Separate from the program and data space, the DSP also includes a 64K-byte I/O space for peripheral
registers.
1.2.1 Program/Data Memory Map
The device provides 16MB of total address space composed of on-chip RAM, on-chip ROM, and external
memory space supporting a variety of memory types. The on-chip, dual-access RAM allows two accesses
to a given block during the same cycle. The device has 8 blocks of 8K-bytes of dual-access RAM. The
on-chip, single-access RAM allows one access to a given block per cycle. The device has 32 blocks of
8K-bytes of single-access RAM. Attempts to perform two accesses in a cycle to single-access memory will
cause one access to stall until the next cycle. An access is defined as either a read or write operation. For
the most efficient use of DSP processing power (MIPS), it is important to pay attention to the memory
blocks that are being simultaneously accessed by the code and data operations.
The external memory space is divided into five spaces. Each space has a chip select decode signal
(called CS) that indicates an access to the selected space. The external memory interface (EMIF)
supports access to asynchronous memories such as SRAM Flash, mobile SDRAM and SDRAM.
The DSP memory is accessible by different master modules within the DSP, including the device CPU, the
four DMA controllers, and the USB. The DSP memory map as seen by these modules is illustrated in
16
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System Memory
Figure 1-2. DSP Memory Map
CPU BYTE
DMA/USB/LCD
ADDRESS(A) BYTE ADDRESS(A)
MEMORY BLOCKS
MMR (Reserved)(B)
BLOCK SIZE
000000h
0000C0h
0001 0000h
0001 00C0h
DARAM(D)
SARAM
64K Minus 192 Bytes
256K Bytes
010000h
050000h
0009 0000h
0100 0000h
External-CS0 Space(C)(E)
8M Minus 320K Bytes SDRAM/mSDRAM
800000h
C00000h
E00000h
F00000h
0200 0000h
0300 0000h
0400 0000h
0500 0000h
External-CS2 Space(C)
External-CS3 Space(C)
4M Bytes Asynchronous
2M Bytes Asynchronous
External-CS4 Space(C)
External-CS5 Space(C)
1M Bytes Asynchronous
1M Minus 128K Bytes Asynchronous
FE0000h
FFFFFFh
050E 0000h
050F FFFFh
External-CS5 Space(C)
(if MPNMC=1)
128K Bytes Asynchronous (if MPNMC=1)
128K Bytes ROM (if MPNMC=0)
ROM
(if MPNMC=0)
A
B
C
D
E
Address shown represents the first byte address in each block.
The first 192 bytes are reserved for memory-mapped registers (MMRs).
Out of the four DMA controllers, only DMA controller 3 has access to the external memory space.
The USB controller does not have access to DARAM.
The CS0 space can be accessed by CS0 only or by CS0 and CS1.
1.2.1.1 On-Chip Dual-Access RAM (DARAM)
The DARAM is located in the CPU byte address range 00 00C0h - 00 FFFFh and is composed of eight
reads, two writes, or a read and a write). DARAM can be accessed by the internal program, data, and
DMA buses.
CPU memory byte address space.
Table 1-2. DARAM Blocks
Memory Block
DARAM 0(1)
DARAM 1
CPU Byte Address Range
00 00C0h - 00 1FFFh
00 2000h - 00 3FFFh
00 4000h - 00 5FFFh
00 6000h - 00 7FFFh
00 8000h - 00 9FFFh
00 A000h - 00 BFFFh
DMA/USB Controller Byte Address Range
0001 00C0h - 0001 1FFFh
0001 2000h - 0001 3FFFh
DARAM 2
0001 4000h - 0001 5FFFh
DARAM 3
0001 6000h - 0001 7FFFh
DARAM 4
0001 8000h - 0001 9FFFh
DARAM 5
0001 A000h - 0001 BFFFh
(1)
First 192 bytes are reserved for memory-mapped registers (MMRs).
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System Memory
Table 1-2. DARAM Blocks (continued)
Memory Block
DARAM 6
CPU Byte Address Range
00 C000h - 00 DFFFh
00 E000h - 00 FFFFh
DMA/USB Controller Byte Address Range
0001 C000h - 0001 DFFFh
DARAM 7
0001 E000h - 0001 FFFFh
1.2.1.2 On-Chip Single-Access RAM (SARAM)
The SARAM is located at the CPU byte address range 01 0000h - 04FFFFh and is composed of 32 blocks
of 4K words each (see Table 1-3). Each SARAM block can perform one access per cycle (one read or one
write). SARAM can be accessed by the internal program, data, and DMA buses.
CPU memory byte address space.
Table 1-3. SARAM Blocks
DMA/USB Controller Byte Address
Memory Block
SARAM 0
CPU Byte Address Range
01 0000h - 01 1FFFh
01 2000h - 01 3FFFh
01 4000h - 01 5FFFh
01 6000h - 01 7FFFh
01 8000h - 01 9FFFh
01 A000h - 01 BFFFh
01 C000h - 01 DFFFh
01 E000h - 01 FFFFh
02 0000h - 02 1FFFh
02 2000h - 02 3FFFh
02 4000h - 02 5FFFh
02 6000h - 02 7FFFh
02 8000h - 02 9FFFh
02 A000h - 02 BFFFh
02 C000h - 02 DFFFh
02 E000h - 02 FFFFh
03 0000h - 03 1FFFh
03 2000h - 03 3FFFh
03 4000h - 03 5FFFh
03 6000h - 03 7FFFh
03 8000h - 03 9FFFh
03 A000h - 03 BFFFh
03 C000h - 03 DFFFh
03 E000h - 03 FFFFh
04 0000h - 04 1FFFh
04 2000h - 04 3FFFh
04 4000h - 04 5FFFh
04 6000h - 04 7FFFh
04 8000h - 04 9FFFh
04 A000h - 04 BFFFh
04 C000h - 04 DFFFh
04 E000h - 04 FFFFh
Range
0009 0000h - 0009 1FFFh
0009 2000h - 0009 3FFFh
0009 4000h - 0009 5FFFh
0009 6000h - 0009 7FFFh
0009 8000h - 0009 9FFFh
0009 A000h - 0009 BFFFh
0009 C000h - 0009 DFFFh
0009 E000h - 0009 FFFFh
000A 0000h - 000A 1FFFh
000A 2000h - 000A 3FFFh
000A 4000h - 000A 5FFFh
000A 6000h - 000A 7FFFh
000A 8000h - 000A 9FFFh
000A A000h - 000A BFFFh
000A C000h - 000A DFFFh
000A E000h - 000A FFFFh
000B 0000h - 000B 1FFFh
000B 2000h - 000B 3FFFh
000B 4000h - 000B 5FFFh
000B 6000h - 000B 7FFFh
000B 8000h - 000B 9FFFh
000B A000h - 000B BFFFh
000B C000h - 000B DFFFh
000B E000h - 000B FFFFh
000C 0000h - 000C 1FFFh
000C 2000h - 000C 3FFFh
000C 4000h - 000C 5FFFh
000C 6000h - 000C 7FFFh
000C 8000h - 000C 9FFFh
000C A000h - 000C BFFFh
000C C000h - 000C DFFFh
000C E000h - 000C FFFFh
SARAM 1
SARAM 2
SARAM 3
SARAM 4
SARAM 5
SARAM 6
SARAM 7
SARAM 8
SARAM 9
SARAM 10
SARAM 11
SARAM 12
SARAM 13
SARAM 14
SARAM 15
SARAM 16
SARAM 17
SARAM 18
SARAM 19
SARAM 20
SARAM 21
SARAM 22
SARAM 23
SARAM 24
SARAM 25
SARAM 26
SARAM 27
SARAM 28
SARAM 29
SARAM 30
SARAM 31
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System Memory
1.2.1.3 On-Chip Single-Access Read-Only Memory (SAROM)
The zero-wait-state ROM is located at the CPU byte address range FE 0000h - FF FFFFh. The ROM is
composed of four 16K-word blocks, for a total of 128K-bytes of ROM. Each ROM block can perform one
access per cycle (one read or one write). ROM can be accessed by the internal program or data buses,
but not the DMA buses. The ROM address space can be mapped by software to the external memory or
to the internal ROM via the MPNMC bit in the ST3 status register.
The standard device includes a Bootloader program resident in the ROM and the bootloader code is
executed immediately after hardware reset. When the MPNMC bit field of the ST3 status register is set
through software, the on-chip ROM is disabled and not present in the memory map, and byte address
range FE 0000h - FF FFFFh is directed to external memory space (extends CS5 address reach). A
hardware reset always clears the MPNMC bit, so it is not possible to disable the ROM at hardware reset.
However, the software reset instruction does not affect the MPNMC bit. The ROM can be accessed by the
program and data buses. Each SAROM block can perform one word read access per cycle.
Table 1-4. SAROM Blocks
Memory Block
SAROM0
CPU Byte Address Range
FE 0000h - FE 7FFFh
FE 8000h - FE FFFFh
FF 0000h - FF 7FFFh
FF 8000h - FF FFFFh
CPU Word Address Range
7F 0000h - 7F 3FFFh
7F 4000h - 7F 7FFFh
7F 8000h - 7F BFFFh
7F C000h - 7F FFFFh
SAROM1
SAROM2
SAROM3
1.2.1.4 External Memory
The external memory space of the device is located at the byte address range 05 0000h - FF FFFFh. The
external memory space is divided into five chip select spaces. The synchronous space is activated by one
chip select pin (EM_CS0) or by a pair of chip selects pins (EM_CS0 and EM_CS1). Each asynchronous
chip select space has a corresponding chip select pin (called EMIF_CS[2:5]) that is activated during an
access to the chip select space.
The external memory interface (EMIF) provides the means for the DSP to access external memories and
other devices including: NOR Flash, NAND Flash, SRAM, mSDRAM, and SDRAM (see section 1.5 for
limitations). Before accessing external memory, you must configure the EMIF through its registers. For
more detail on the EMIF, see the TMS320C5515/14/05/04 DSP External Memory Interface (EMIF) User’s
As described in Section 1.2.1.3, when the MPNMC bit field of the ST3 status register is cleared (default),
the byte address range FE 0000h - FF FFFFh is reserved for the on-chip ROM, which decreases the
addressable size for EM_CS5.
The EMIF provides a configurable 16-bit (synchronous or asynchronous) or 8-bit (asynchronous only) data
bus, an address bus width of up to 21-bits, and five dedicated chip selects, along with memory control
signals. To maximize power savings, the I/O pins of the EMIF can be operated at lower voltage
independently of other I/O pins on the DSP. Further power savings may be achieved by setting the EMIF
1.2.1.4.1 Asynchronous EMIF Interface
The EMIF provides a configurable 16- or 8-bit data bus with address bus width of up to 21-bits, and six
dedicated chip selects, along with memory control signals. The cycle timings of the asynchronous
interface are fully programmable, allowing for access to a wide range of devices including NAND flash,
NOR flash, and SRAM as well as other asynchronous devices such as a TI DSP HPI interface. In NAND
mode, the asynchronous interface supports 1-bit ECC for 8- and 16-bit NAND flash and 4-bit ECC for 8-bit
NAND flash.
1.2.1.5 Synchronous EMIF Interface
The EMIF provides a 16-bit data bus with one or two dedicated chip selects for mSDRAM. Non-mobile
SDRAM can be supported under certain circumstances. The C5515 always uses a mobile SDRAM
initialization command sequence, but it is able to support SDRAM memories that ignore the BA0 and BA1
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Device Clocking
pins for the load mode register command. During the mobile SDRAM initialization, the device issues the
load mode register initialization command to two different addresses that differ in only the BA0 and BA1
address bits. These registers are the Extended Mode register and the Mode register. The extended mode
register exists only in mSDRAM, and not in non-mSDRAM. If a non-mobile SDRAM memory ignores bits
BA0 and BA1, the second loaded register value overwrites the first, leaving the desired value in the mode
register and the non-mobile SDRAM works with the device.
Some timing parameters are programmable such as the refresh rate and CAS latencies. The EMIF
supports up to 100 MHz SDCLK and has the ability to run the SDCLK at half the system clock to meet the
EMIF I/O timing requirements and/or at lower power if a slower SDCLK can be used. Detailed information
is available in the Clock Control section of the TMS320C5515/14/05/04 DSP External Memory Interface
1.2.2 I/O Memory Map
The C5x DSP has a separate memory map for peripheral and system registers, called I/O space. This
space is 64K-words in length and is accessed via word read and write instructions dedicated for I/O
space.
Separate documentation for I/O space registers related to each peripheral exists and is listed in the
preface of this guide. System registers, which provide system-level control and status, are described in
detail in other sections throughout this guide. Unused addresses in I/O space should be treated as
reserved and should not be accessed. Accessing unused I/O space addresses may stall or hang the DSP.
Each of the four DMA controllers has access to a different set of peripherals and their I/O space registers.
NOTE: Writting to I/O space registers incurs in at least 2 CPU cycle latency. Thus, when
configuring peripheral devices, wait at least two cycles before accessing data from the
peripheral. When more than one peripheral register is updated in a sequence, the CPU only
needs to wait following the final register write. For example, if the EMIF is being
reconfigured, the CPU must wait until the very last EMIF register update takes effect before
trying to access the external memory. The users should consult the respective peripheral
user's guide to determine if a peripheral requires additional initialization time.
Before accessing any peripheral register, make sure the peripheral is not held in reset and its internal
clock is enabled. The peripheral reset control register (Section 1.7.5.2) and the peripheral clock gating
control registers (Section 1.5.3.2.1) control these functions. Accessing a peripheral whose clocks are
gated will either return the value of the last address read from the peripheral (when the clocks were last
ON) or it may possibly hang the DSP -- depending on the peripheral.
1.3 Device Clocking
1.3.1 Overview
The DSP requires two primary reference clocks: a system reference clock and a USB reference clock. The
system clock, which is used by the CPU and most of the DSP peripherals, is controlled by the system
clock generator. The system clock generator features a software-programmable PLL multiplier and several
dividers. The system clock generator accepts an input reference clock from the CLKIN pin or the output
clock of the 32.768-KHz real-time clock (RTC) oscillator. The selection of the input reference clock is
based on the state of the CLK_SEL pin. The CLK_SEL pin is required to be statically tied high or low and
cannot change dynamically after reset. The system clock generator can be used to modify the system
reference clock signal according to software-programmable multiplier and dividers. The resulting clock
output, the DSP system clock, is passed to the CPU, peripherals, and other modules inside the DSP.
Alternatively, the system clock generator can be fully bypassed and the input reference clock can be
passed directly to the DSP system clock. The USB reference clock is generated using a dedicated on-chip
oscillator with a 12 MHz external crystal connected to the USB_MXI and USB_MXO pins. This crystal is
not required if the USB peripheral is not being used. The USB oscillator cannot be used to provide the
system reference clock.
The RTC oscillator generates a clock when a 32.768-KHz crystal is connected to the RTC_XI and
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Device Clocking
RTC_XO pins. RTC core (CVDDRTC) must be powered all the time but the 32.768-KHz crystal can be
disabled if CLKIN is used as the clock source for the DSP. However, when the RTC oscillator is disabled,
the RTC peripheral will not operate and the RTC registers (I/O address range 1900h - 197Fh) will not be
accessible. This includes the RTC power management register (RTCPMGT) which controls the
RTCLKOUT and WAKEUP pins. To disable the RTC oscillator, connect the RTC_XI pin to CVDDRTC and
the RTC_XO pin to ground.
The USB oscillator is powered down at hardware reset. It must be enabled (by the NNN register) and
must be allowed to settle for an amount of time specified by USB Oscillator Startup Time parameter in the
device specific manual before using the USB peripheral.
Figure 1-3 shows the overall DSP clock structure. For detailed specifications on clock frequency, voltage
requirements, and oscillator/crystal requirements, see the device-specific data manual.
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Device Clocking
Figure 1-3. DSP Clocking Diagram
CLKSEL
CLKIN
1
0
CLKREF
ST3_55[CLKOFF]
CLKOUT
System Clock
Generator
1
0
LS
LS
SYSCLK
(2)
(1)
(1)
ICR[HWAI]
FFT Hardware
PCGCR1
[SYSCLKDIS]
CCR2
[SYSCLKSEL]
Accelerator
RTC Clock
ICR[MPORTI]
MPORT Clock
(1)
LS
RTC_CLKOUT
RTC_XI
32.768
ICR[XPORTI]
XPORT Clock
RTC
OSC
RTC
PCGCR1[DMA0CG]
KHz
RTC_XO
DMA0
PCGCR2[DMA1CG]
ICR[IPORTI]
IPORT Clock
DMA1
PCGCR2[DMA2CG]
ICR[DPORTI]
DPORT Clock
DMA2
PCGCR2[DMA3CG]
ICR[CPUI]
CPU Clock
DMA3
USB
PHY
ECDR[EDIV]
PCGCR1[EMIFCG]
PCGCR2[USBCG]
60 MHz
0
1
÷2
LS
USB
Digital
EMIF
(1)
USB_MXI
12 MHz
12 MHz
USB
PLL
OFF
USB
OSC
PCGCR1[SPICG]
PCGCR1[I2CCG]
UDB_MXO
SPI
PCGCR1[I2S0CG]
LS
I2C
PCGCR1[UARTCG]
(1)
I2S0
PCGCR1[I2S1CG]
USBSCR
[USBOSCDIS]
UART
PCGCR1[TMR2CG]
I2S1
PCGCR1[I2S2CG]
Timer2
PCGCR1[TMR1CG]
I2S2
PCGCR1[I2S3CG]
Timer1
PCGCR1[TMR0CG]
Timer0
I2S3
PCGCR2[SARCG]
SAR
PCGCR2[LCDCG]
LCD Controller
PCGCR1[MMCSD0CG]
MMC/SD0
PCGCR2[ANAREGCG]
PCGCR1[MMCSD1CG]
MMC/SD1
Analog
Registers
(1) LS = Level Shifter
(2) The CLKOUT pin's output driver is enabled/disabled through the CLKOFF bit of the CPU ST3_55 register. At
the beginning of the boot sequence, the on-chip Bootloader sets CLKOFF = 1 and CLKOUT pin is disabled
(high-impedance). For more information on the ST3_55 register, see the TMS320C55x 3.0 CPU Reference
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System Clock Generator
1.3.2 Clock Domains
The device has many clock domains defined by individually disabled portions of the clock tree structure.
Understanding the clock domains and their clock enable/disable control registers is very important for
managing power and for ensuring clocks are enabled for domains that are needed. By disabling the clocks
and thus the switching current in portions of the chip that are not used, lower dynamic power consumption
can be achieved and prolonging battery life.
Figure 1-3 shows the clock tree structure with the clock gating represented by the AND gates. Each AND
gate shows the controlling register that allows the downstream clock signal to be enabled/disabled. Once
disabled most clock domains can be re-enabled, when the associated clock domain logic is needed, via
software running on the CPU. But some domains actually stop the clocks to the CPU and therefore
software running on the CPU cannot be responsible for re-enabling those clock domains. Other
mechanism must exist for restarting those clocks, and the specific cases are listed below:
•
The System Clock Generator (PLL) can be powered-down by writing a 1 to PLL_PWRDN bit in the
clock generator control register CGCR1. This stops the PLL from oscillating and shuts down its analog
circuits. It is important to bypass the System Clock Generator by writing 0 to SYSCLKSEL bit in CCR2
(clock confguration register 2) prior to powering it down, else the CPU will loose its clock and not be
able to recover without hardware reset.
NOTE: Failsafe logic exists to prevent selecting the PLL clock if it has been powered down but this
logic does not protect against powering down the PLL while it is selected as the system clock
source. Therefore, software should always maintain responsibility for bypassing the PLL prior
to and whenever it is powered down.
•
•
The SYSCLKDIS bit in PCGCR1 [clock gating control register 1) is the master clock gater. Asserting
this bit causes the main system clock, SYSCLK, to stop and, therefore, the CPU and all peripherals no
longer receive clocks. The WAKEUP pin, INT0 & INT1 pin, or RTC interrupt can be used to re-enable
the clock from this condition.
The ICR bit in CPUI(clock gating control register) gates clocks to the CPU and uses the CPU’s idle
instruction to initiate the clock off mode. Any non-masked interrupt can be used to re-enable the CPU
clocks.
1.4 System Clock Generator
1.4.1 Overview
dividers. The clock generator accepts an input clock from the CLKIN pin or the output clock of the
real-time clock (RTC) oscillator. The clock generator offers flexibility and convenience by way of
software-configurable multiplier and divider to modify the clock rate internally. The resulting clock output,
SYSCLK, is passed to the CPU, peripherals, and other modules inside the DSP.
A set of registers are provided for controlling and monitoring the activity of the clock generator. You can
write to the SYSCLKSEL bit in CCR2 register to toggle between the two main modes of operation:
•
of SYSCLK is determined by CLKIN or the RTC oscillator output. Once the PLL is bypassed, the PLL
can be powered down to save power.
•
produce the desired SYSCLK frequency, and the SYSCLK signal is phase-locked to the input clock
signal (CLKREF).
The clock generator bypass mux (controlled by SYSCLKSEL bit in CCR2 register) is a glitchfree mux,
which means that clocks will be switched cleanly and not short cycle pulses when switching among the
BYPASS MODE and PLL MODE.
For debug purposes, the CLKOUT pin can be used to see different clocks within the clock generator. For
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System Clock Generator
Figure 1-4. Clock Generator
0
1
CLKSEL
CLKIN
LS
1
0
SYSCLK
1
Output
Divider
1
PLL
PLLIN
Reference
Divider
PLLOUT
LS
0
CGCR4.
[OUTDIVEN]
CLKREF
0
CCR2.
[SYSCLKSEL]
RTC Clock
CGCR2[RDBYPASS]
LS
RTC_CLKOUT
RTC_XI
32.768
KHz
RTC
OSC
RTC
RTC_XO
1.4.2 Functional Description
The following sections describe the multiplier and dividers of the clock generator.
1.4.2.1 Multiplier and Dividers
The clock generator has a one multiplier and a two programmable dividers: one before the PLL input and
one on the PLL output. The PLL can be programmed to multiply the PLL input clock, PLLIN, using a x4 to
x4099 multiplier value. The reference clock divider can be programmed to divide the clock generator input
clock from a /4 to /4099 divider ratio and may be bypassed. The Reference Divider and RDBYPASS mux
must be programmed such that the PLLIN frequency range is 32.786 KHz to 170 KHz. At the output of the
PLL, the output divider can be used to divide the PLL output clock, PLLOUT, from a /1 to a /128 divider
ratio and may also be bypassed. The PLL output, PLLOUT, frequency must be programmed within the
range of at least 60 MHz and no more than the maximum operating frequency defined by the datasheet,
mind that programming the output divider with an odd divisor value other than 1 will result in a non-50%
duty cycle SYSCLK. This is not a problem for any of the on-chip logic, but the non-50% duty cycle will be
values of PLLIN, PLLOUT, and SYSCLK.
The multiplier and divider ratios are controlled through the PLL control registers. The M bits define the
multiplier rate. The RDRATIO and ODRATIO bits define the divide ratio of the reference divider and
programmable output divider, respectively. The RDBYPASS and OUTDIVEN bits are used to enable or
bypass the dividers. Table 1-5 lists the formulas for the output frequency based on the setting of these
bits.
The clock generator must be placed in BYPASS MODE when any PLL dividers or multipliers are changed.
Then, it must remain in BYPASS MODE for at least 4 mS before switching to PLL MODE.
Table 1-5. PLL Output Frequency Configuration
RDBYPASS
OUTDIVEN
SYSCLK Frequency
0
0
M + 4
(
RDRATIO + 4
)
CLKREF´
0
1
M + 4
(
RDRATIO + 4 ODRATIO + 1
)
1
CLKREF´
´
1
1
0
1
CLKREF´ M + 4
é
ù
û
ë
1
CLKREF´ M + 4 ´
é
ù
ë
û
ODRATIO + 1
1.4.2.2 Powering Down and Powering Up the System PLL
To save power, you can put the PLL in its power down mode. You can power down the PLL by setting the
PLL_PWRDN = 1 in the clock generator control register CGCR1. However, before powering down the
PLL, you must first place the clock generator in bypass mode.
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System Clock Generator
When the PLL is powered up (PLL_PWRDN = 0), the PLL will start its phase-locking sequence. You must
keep the clock generator in BYPASS MODE for at least 4 mS while the phase-locking sequence is
1.4.2.3 CLKOUT Pin
For debug purposes, the DSP includes a CLKOUT pin which can be used to tap different clocks within the
clock generator. The SRC bits of the CLKOUT control source register (CCSSR) can be used to specify the
NOTE: There is no internal logic to prevent glitches while changing the CLKOUT source. Also there
is no provision for internally dividing down the CLKOUT frequency other than the options
inherently available for selecting the CLKOUT source.
The CLKOUT pin's output driver is enabled/disabled through the CLKOFF bit of the CPU ST3_55 register.
At hardware reset, CLKOFF is cleared to 0 so that the clock is visible for debug purposes. But within the
bootloader romcode, CLKOFF is set to 1 to conserve power. After the bootloader finishes, the customer
application code is free to re-enable CLKOUT. For more information on the ST3_55 register, see the
The slew rate (i.e., dV/dt) of the CLKOUT pin can be controlled by the CLKOUTSR bits in the output slew
rate control register (OSRCR). This feature allows for additional power savings when the CLKOUT pin
does not need to drive large loads.
Figure 1-5. CLKOUT Control Source Select Register (CCSSR) [1C24h]
15
4
3
0
Reserved
R-0
SRC
R/W-Bh
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-6. CLKOUT Control Source Select Register (CCSSR) Field Descriptions
Bit
15-4
3-0
Field
Value Description
Reserved
SRC
0
Reserved.
CLKOUT source bits. These bits specify the source clock for the CLKOUT pin.
CLKOUT pin outputs System PLL output clock, PLLOUT.
CLKOUT pin is set high.
0
1h
2h
3h
4h
5h
6h
7h
8h
9h
Ah
Bh
Ch
Dh
Eh
Fh
CLKOUT pin outputs System PLL output clock, PLLOUT.
CLKOUT pin is set low.
CLKOUT pin outputs System PLL output clock, PLLOUT.
CLKOUT pin is set low.
CLKOUT pin outputs System PLL output clock, PLLOUT.
CLKOUT pin outputs USB PLL output clock.
CLKOUT pin outputs System PLL output clock, PLLOUT.
CLKOUT pin outputs SAR clock.
CLKOUT pin outputs System PLL output clock, PLLOUT.
CLKOUT pin outputs system clock, SYSCLK (default mode).
CLKOUT pin outputs System PLL output clock, PLLOUT.
Reserved, do not use.
CLKOUT pin outputs System PLL output clock, PLLOUT.
CLKOUT pin outputs USB PLL output clock.
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System Clock Generator
1.4.2.4 DSP Reset Conditions of the System Clock Generator
The following sections describe the operation of the system clock generator when the DSP is held in reset
state and the DSP is removed from its reset state.
1.4.2.4.1 Clock Generator During Reset
During reset, the PLL_PWRDN bit of the clock generator control register 1 (CGCR1) is set to 1, and the
PLL does not generate an output clock. Furthermore, the SYSCLKSEL bit of the clock configuration
register 2 (CCR2) defaults to 0 (BYPASS MODE), and the system clock (SYSCLK) is driven by either the
CLKIN pin or the real-time clock (RTC). See Section 1.4.3.1 for more information on the bypass mode of
the clock generator.
1.4.2.4.2 Clock Generator After Reset
After reset, the on-chip bootloader programs the system clock generator based on the input clock selected
via the CLK_SEL pin. If CLK_SEL = 0, the bootloader programs the system clock generator and sets the
system clock to 12.288 MHz (multiply the 32.768-kHz RTC oscillator clock by 375). If CLK_SEL = 1, the
bootloader bypasses the system clock generator altogether and the system clock is driven by the CLKIN
pin. In this case, the CLKIN frequency is expected to be 11.2896 MHz, 12.0 MHz, or 12.288 MHz. While
the bootloader tries to boot from the USB , the clock generator is programmed to output approximately 36
MHz.
1.4.3 Configuration
1.4.3.1 BYPASS MODE
When the system clock generator is in the BYPASS MODE, the clock generator is not used and the
system clock (SYSCLK) is driven by either the CLKIN pin or the real-time clock (RTC).
NOTE: In bypass mode, the PLL is not automatically powered down and will still consume power.
For maximum power savings, the PLL should be placed in its power-down mode. See
Section 1.4.2.2 for more details.
1.4.3.1.1 Entering and Exiting the BYPASS MODE
To enter the bypass mode, write a 0 to the SYSCLKSEL bit in the clock configuration register 2 (CCR2). In
bypass mode, the frequency of the system clock (SYSCLK) is determined by the CLK_SEL pin. If
CLK_SEL = 0, SYSCLK is driven by the output of the RTC. Otherwise, SYSCLK will be driven by the
CLKIN pin.
To exit the BYPASS MODE, ensure the PLL has completed its phase-locking sequence by waiting at least
4 ms and then write a 1 to the SYSCLKSEL bit. The frequency of SYSCLK will then be determined by the
multiplier and divider ratios of the PLL System Clock Generator.
If the clock generator is in the PLL MODE and you want to reprogram the PLL or any of the dividers, you
must set the clock generator to BYPASS MODE before changing the PLL and divider settings.
Logic within the clock generator ensures that there are no clock glitches during the transition from PLL
MODE to BYPASS MODE and vice versa.
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System Clock Generator
1.4.3.1.2 Register Bits Used in the BYPASS MODE
Table 1-7 describes the bits of the clock generator control registers that are used in the BYPASS MODE.
Table 1-7. Clock Generator Control Register Bits Used In BYPASS MODE
Register Bit
SYSCLKSEL
PLL_PWRDN
Role in BYPASS MODE
Allows you to switch to the PLL or BYPASS MODES.
Allows you to power down the PLL.
1.4.3.1.3 Setting the System Clock Frequency In the BYPASS MODE
In the BYPASS MODE, the frequency of SYSCLK is determined by the CLK_SEL pin. If CLK_SEL = 0,
SYSCLK is driven by the output of the RTC. Otherwise, SYSCLK will be driven by the CLKIN pin.
NOTE: The CLK_SEL pin must be statically tied high or low; it cannot be changed after the device
has been powered up.
Table 1-8. Output Frequency in Bypass Mode
CLK_SEL
SYSCLK Source / Frequency
1
CLKIN, expected to be one of the following values by the bootloader: 11.2896
MHz, 12.0MHz, or 12.288 MHz
0
RTC clock = 32.768 kHz
The state of the CLK_SEL pin is read via the CLKSELSTAT bit in the CCR2 register.
1.4.3.2 PLL MODE
In PLL MODE, the frequency of the input clock signal (CLKREF) can be both multiplied and divided to
produce the desired output frequency, and the output clock signal is phase-locked to the input clock
signal.
1.4.3.2.1 Entering and Exiting the PLL MODE
To enter the PLL_MODE from BYPASS_MODE, first program the PLL to the desired frequency. You must
always ensure the PLL has completed its phase-locking sequence before switching to PLL MODE. This
PLL has no lock indicator as such indicators are notoriously unreliable. Instead, a fixed amount of time
must be allowed to expire while in BYPASS_MODE to allow the PLL to lock. After 4 msec, write a 1 to the
SYSCLKSEL bit in the clock configuration register 2 (CCR2) to set the system clock to the output of the
PLL.
Whenever PLL needs to be reprogrammed, first the clock generator must be in bypass mode, and then
changed to PLL configuration. After waiting 4 msec, write a 1 to the SYSCLKSEL bit to get into the PLL
MODE.
Logic within the clock generator ensures that there are no clock glitches during the transition from
BYPASS MODE to PLL MODE and vice versa.
1.4.3.2.2 Register Bits Used in the PLL Mode
Table 1-9 describes the bits of the clock generator control registers that are used in the PLL MODE. For
Table 1-9. Clock Generator Control Register Bits Used In PLL Mode
Register Bit
SYSCLKSEL
RDBYPASS
Role in Bypass Mode
Allows you to switch to the PLL or bypass modes.
Determines whether reference divider should be bypassed or used.
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System Clock Generator
Table 1-9. Clock Generator Control Register Bits Used In PLL Mode (continued)
Register Bit
RDRATIO
M
Role in Bypass Mode
Specifies the divider ratio of the reference divider.
Specify the multiplier value for the PLL.
Determines whether the output divider is bypassed.
Specifies the divider ratio of the output divider.
OUTDIVEN
ODRATIO
1.4.3.2.3 Frequency Ranges for Internal Clocks
There are specific minimum and maximum frequencies for all the internal clocks. Table 1-10 lists the
minimum and maximum frequencies for the internal clocks for the DSP.
NOTE: For actual maximum operating frequencies, see the device-specific data sheet.
Table 1-10. PLL Clock Frequency Ranges
CVDD = 1.05 V
CVDD = 1.3 V
NOM
Clock Signal Name
MIN
NOM
MAX
MIN
MAX
UNIT
CLKIN(1)
11.289
6
11.28
96
MHz
12
12
12.28
8
12.288
32.76
8
RTC Clock
32.768
KHz
PLLIN
32.0
60
0
170
120
32.0
60
170
120
KHz
MHz
PLLOUT
100 or
120
SYSCLK
60 or 75
0
4
MHz
ms
PLL_LOCKTIME
4
(1)
These CLKIN values are used when the CLK_SEL pin = 1. Bootloader assumes one of these CLKIN
frequencies.
1.4.3.2.4 Setting the Output Frequency for the PLL MODE
The clock generator output frequency configured based on the settings programmed in the clock generator
control registers. The output frequency depends on primarily on three factors: the reference divider value,
the PLL multiplier value, and the output divider value (see Figure 1-4). Based on the register settings
controlling these divider and multiplier values, you can calculate the frequency of the output clock using
Follow these steps to determine the values for the different dividers and multipliers of the system clock
generator:
1. With the desired clock frequency in mind, choose a PLLOUT frequency that falls within the range listed
frequency of the PLL.
2. Determine the divider ratio for the reference divider that will generate the PLLIN frequency that meets
the requirements listed in Table 1-10. When possible, choose a high value for PLLIN to optimize PLL
performance. If the DSP is being clocked by the RTC oscillator output, the reference divider must
bypassed (set RDBYPASS = 1); PLLIN will be 32.768 kHz.
3. Determine a multiplier value that generates the desired PLLOUT frequency given the equation:
multiplier = round( PLLOUT/PLLIN ).
4. Using the multiplier, figure out the values for M (PLL multiplier = M + 4).
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System Clock Generator
Table 1-11 shows programming examples for different PLL MODE frequencies.
Table 1-11. Examples of Selecting a PLL MODE Frequency, When CLK_SEL=L
RDBYPASS
OUTDIVEN
M
RDRATIO
ODRATIO
PLL Output Frequency
1
1
1
1
1
1
0
1
0
0
0
0
173h
E4Ah
723h
8EDh
BE8h
E4Ah
X
X
X
X
X
X
X
2
32.768KHz x (173h+4) = 12.288 MHz
32.768KHz x (E4Ah + 4)/3 = 40.00 MHz
32.768KHz x (723h + 4) = 60.00 MHz
32.768KHz x (8EDh + 4) = 75.01 MHz
32.768KHz x (BE7h + 4) = 100.01 MHz
32.768KHz x (E4Ah + 4) = 120.00 MHz
X
X
X
X
1.4.3.2.5 Lock Time
As previously discussed, you must place the clock generator in bypass mode before changing the PLL
settings. The time it takes the PLL to complete its phase-locking sequence is referred to as the lock time.
The PLL has a lock time of 4 ms. Software is responsible for ensuring the PLL remains in
BYPASS_MODE for at least 4 ms before switching to PLL_MODE.
1.4.3.2.6 Software Steps To Modify Multiplier and Divider Ratios
You can follow the steps below to program the PLL of the DSP clock generator. The recommendation is to
stop all peripheral operation before changing the PLL frequency, with the exception of the device CPU and
USB. The device CPU must be operational to program the PLL controller. Software is responsible for
ensuring the PLL remains in BYPASS_MODE for at least 4 ms before switching to PLL_MODE.
1. Make sure the clock generator is in BYPASS MODE by setting SYSCLKSEL = 0.
2. Set CLR_CNTL = 0 in CGCR1.
3. Program RDRATIO, M, and RDBYPASS in CGCR2 according to your required settings.
4. Program ODRATIO and OUTDIVEN in CGCR4 according to your required settings.
5. Write 0806h to the INIT field of CGCR3.
6. Set PLL_PWRDN = 0, CLR_CNTL = 1.
7. Wait 4 ms for the PLL to complete its phase-locking sequence.
8. Place the clock generator in its PLL MODE by setting SYSCLKSEL = 1.
1.4.4 Clock Generator Registers
Table 1-12 lists the registers associated with the clock generator of the DSP. The clock generator
registers can be accessed by the CPU at the 16-bit addresses specified in Table 1-12. Note that the CPU
accesses all peripheral registers through its I/O space. All other register addresses not listed in Table 1-12
should be considered as reserved locations and the register contents should not be modified.
Table 1-12. Clock Generator Registers
CPU Word
Address
Acronym
Register Description
Section
1C20h
1C21h
1C22h
1C23h
1C1Eh
1C1Fh
CGCR1
CGCR2
CGCR3
CGCR4
CCR1
Clock Generator Control Register 1
Clock Generator Control Register 2
Clock Generator Control Register 3
Clock Generator Control Register 4
Clock Configuration Register 1
CCR2
Clock Configuration Register 2
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System Clock Generator
1.4.4.1 Clock Generator Control Register 1 (CGCR1) [1C20h]
Figure 1-6. Clock Generator Control Register 1 (CGCR1) [1C20h]
15
14
6
13
12
11
8
0
Reserved
R/W-0
Reserved
R/W-0
PLL_PWRDN
R/W-1
M
R/W-0
7
5
4
3
2
1
M
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-13. Clock Generator Control Register 1 (CGCR1) Field Descriptions
Bit
Field
Value Description
15
Reserved
0
0
This bit must be set to 1 for normal operation.
Reserved. This bit must be always written to be zero.
PLL power down bit. This bit is used to power down the PLL when it is not being used.
PLL is powered up.
14-13 Reserved
12
PLL_PWRDN
0
1
PLL is powered down.
11-0
M
0-FFFh PLL multiplier value bits. These bits define the PLL multiplier value. Multiplier value = M + 4.
1.4.4.2 Clock Generator Control Register 2 (CGCR2) [1C21h]
Figure 1-7. Clock Generator Control Register 2 (CGCR2) [1C21h]
15
14
12
11
0
RDBYPASS
R/W-0
Reserved
R-0
RDRATIO
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-14. Clock Generator Control Register 2 (CGCR2) Field Descriptions
Bit
Field
Value Description
15
RDBYPASS
Reference divider bypass control. When this bit is set to 1 the PLL reference divider is bypassed
(i.e., FPLLIN = FCLKREF). When this bit is set to 0, the reference clock to the PLL is divided by the
reference divider (i.e., FPLLIN = FCLKIN / (RDRATIO+4)). The RDRATIO bits specify the divider value.
0
1
0
Use the reference divider.
Bypass the reference divider.
Reserved.
14-12 Reserved
11-0
RDRATIO
0-FFFh Divider ratio bits for the reference divider. Divider value = RDRATIO + 4. For example, setting
RDRATIO = 0 means divide the input clock rate by 4.
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System Clock Generator
1.4.4.3 Clock Generator Control Register 3 (CGCR3) [1C22h]
Figure 1-8. Clock Generator Control Register 3 (CGCR3) [1C22h]
15
0
INIT
R/W-0806h
LEGEND: R/W = Read/Write; -n = value after reset
Table 1-15. Clock Generator Control Register 3 (CGCR3) Field Descriptions
Bit
Field
Value
Description
15-0
INIT
0x0806h
Initialization bits for the DSP clock generator. These bits are used for testing purposes and
must be initialized with 0x806 during PLL configuration for proper operation of the PLL.
1.4.4.4 Clock Generator Control Register 4 (CGCR4) [1C23h]
Figure 1-9. Clock Generator Control Register 4 (CGCR4) [1C23h]
15
10
9
8
7
0
Reserved
R-0
OUTDIVEN
R/W-0
Reserved
R-0
ODRATIO
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-16. Clock Generator Control Register 4 (CGCR4) Field Descriptions
Bit
Field
Value Description
15-10 Reserved
0
Reserved.
9
OUTDIVEN
Output divider enable bit. This bit determines whether the output divider of the PLL is are
enabled or bypassed.
0
1
0
The output divider is bypassed.
The output divider is enabled.
Reserved.
8
Reserved
ODRATIO
7-0
0-FFh Divider ratio bits for the output divider of the PLL.
Divider value = ODRATIO + 1.
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System Clock Generator
1.4.4.5 Clock Configuration Register 1 (CCR1) [1C1Eh]
Figure 1-10. Clock Configuration Register 1 (CCR1) [1C1Eh]
15
1
0
Reserved
R-0
SDCLK_EN
R/W-0
LEGEND: R = Read only; -n = value after reset
Table 1-17. Clock Configuration Register 1 (CCR1) Field Descriptions
Bit
15-1
0
Field
Value Description
Reserved
SDCLK_EN
0
Reserved. This bit must be kept as 0 during writes to this register.
SDRAM clock enable control. When ON, the EM_SDCLK pin will drive the clock signal at the
SYSCLK frequency if in full_rate mode or at SYSCLK frequency divided by 2 if in half_rate mode.
When OFF, the EM_SDCLK pin will drive low. Transitions from ON to OFF and OFF to ON are not
guaranteed to be glitchless. Therefore, the EMIF should be reset after any change.
0
1
EM_SDCLK off (default)
EM_SDCLK on. This bit must be set to 1 before using SDRAM or mSDRAM.
1.4.4.6 Clock Configuration Register 2 (CCR2) [1C1Fh]
Figure 1-11. Clock Configuration Register 2 (CCR2) [1C1Fh]
15
6
5
4
3
2
1
0
Reserved
R-0
SYSCLKSRC
R-0
Reserved
R/W-0
CLKSELSTAT
R-0
Reserved
R-0
SYSCLKSEL
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-18. Clock Configuration Register 2 (CCR2) Field Descriptions
Bit
15-6
5-4
Field
Value Description
Reserved
SYSCLKSRC
0
Reserved.
System clock source status bits. These read-only bits reflect the source for the system clock. This
status register exists to indicate that switching from the PLL BYPASS_MODE to the PLL_MODE
was successful or not. Logic exists on the chip to prevent switching to PLL_MODE if the PLL has its
PWRDN bit already asserted. However, this circuit does not protect against asserting the PWRDN
bit after already in PLL_MODE. Therefore, software must ultimately make sure not to do something
that would cause the system clock to be lost.
0
The system clock generator is in bypass mode; SYSCLK is driven by the RTC oscillator output.
The system clock generator is in PLL mode; the RTC oscillator output provides the input clock.
The system clock generator is in bypass mode; SYSCLK is driven by CLKIN.
The system clock generator is in PLL mode; the CLKIN pin provides the input clock.
Reserved. This bit must be written to be 0.
1h
2h
3h
0
3
2
Reserved
CLKSELSTAT
CLK_SEL pin status bit. This reflects the state of the CLK_SEL pin.
CLK_SEL pin is low (RTC input clock selected).
0
1
0
CLK_SEL pin is high (CLKIN input clock selected).
1
0
Reserved
Reserved. This bit must be written to be 0.
SYSCLKSEL
System clock source select bit. This bit is used to select between the two main clocking modes for
the DSP: bypass and PLL mode. In bypass mode, the DSP clock generator is bypassed and the
system clock is set to either CLKIN or the RTC output (as determined by the CLKSEL pin). In PLL
mode, the system clock is set to the output of the DSP clock generator. Logic in the system clock
generator prevents switching from bypass mode to PLL mode if the PLL is powered down.
0
1
Bypass mode is selected.
PLL mode is selected.
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Power Management
1.5 Power Management
1.5.1 Overview
In many applications there may be specific requirements to minimize power consumption for both power
supply (and battery) and thermal considerations. There are two components to power consumption: active
power and leakage power. Active power is the power consumed to perform work and, for digital CMOS
circuits, scales roughly with clock frequency and the amount of computations being performed. Active
power can be reduced by controlling the clocks in such a way as to either operate at a clock frequency
just high enough to complete the required operation in the required time-line or to run at a high enough
clock frequency until the work is complete and then drastically cut the clocks (that is, to bypass mode or
clock gate) until additional work must be performed.
Leakage power is due to static current leakage and occurs regardless of the clock rate. Leakage, or
standby power, is unavoidable while power is applied and scales roughly with the operating junction
temperatures. Leakage power can only be avoided by removing power completely.
The DSP has several means of managing the power consumption, as detailed in the following sections.
There is extensive use of automatic clock gating in the design as well as software-controlled module clock
gating to not only reduce the clock tree power, but to also reduce module power by freezing its state while
not operating. Clock management enables you to slow the clocks down on the chip in order to reduce
switching power. Independent power domains allow you to shut down parts of the DSP to reduce static
power consumption. When not being used, the internal memory of the DSP can also be placed in a low
leakage power mode while preserving the memory contents. The operating voltage and drive strength of
the I/O pins can also be reduced to decrease I/O power consumption.
Table 1-19 summarizes all of the power management features included in the DSP.
Table 1-19. Power Management Features
Power Management Features
Description
Clock Management
PLL power-down
The system PLL can be powered-down when not in use to
reduce switching and bias power.
Peripheral clock idle
Core Voltage Scaling
Peripheral clocks can be idled to reduce switching power.
Dynamic Power Management
The DSP LDO and DSP logic support two voltage ranges to
allow voltage adjustments on-the-fly, increasing voltage during
peak processing power demand and decreasing during low
demand.
Static Power Management
DARAM/SARAM low power modes
Independent power domains
The internal memory of the DSP can be placed in a low leakage
power mode while preserving memory contents.
DSP Core (CVDD) and USB Core (USB_VDD1P3, USB_VDDA1P3
)
can be shut off while other supplies remain powered.
I/O Management
I/O voltage selection
USB power-down
The operating voltage and/or slew rate of the I/O pins can be
reduced (at the expense of performance) to decrease I/O power
consumption.
The USB peripheral can be powered-down when not being
used.
1.5.2 Power Domains
The DSP has separate power domains which provide power to different portions of the device. The
separate power domains allow the user to select the optimal voltage to achieve the lowest power
consumption at the best possible performance. Note that several power domains have similar voltage
requirements and, therefore, could be grouped under a single voltage domain.
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Power Management
Table 1-20. DSP Power Domains
Power Domains
Description
Real-Time Clock Power Domain
(CVDDRTC
This domain powers the real-time clock digital circuits and oscillator pins ( RTC_XI,
RTC_XO).
)
Nominal supply voltage can be 1.05 V through 1.3 V. Note: This domain must be always
powered for proper operation.
This domain cannot be regulated internally, external regulation must be provided.
Core Power Domain
(CVDD
This domain powers the digital circuits that include the C55x CPU, on-chip memory, and
peripherals.
)
Nominal supply voltage is either 1.05 V or 1.3 V. This domain can be powered from the
on-chip DSP_LDO.
Digital I/O Power Domain 1
(DVDDEMIF
This domain powers all I/Os, except the EMIF I/O, USB I/O, USB oscillator I/O, some of
the analog related digital pins, and the real-time clock power domain I/O.
)
Nominal supply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
This domain powers all EMIF I/O only.
Digital I/O Power Domain 2
(DVDDIO
)
Nominal supply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
This domain powers the WAKEUP and RTC_CLKOUT pins.
Nominal supply voltage can be 1.8, 2.5, 2.75, or 3.3 V.
RTC I/O Power Domain
(DVDDRTC
)
This domain cannot be powered by internal LDOs, external regulation must be provided.
This domain powers the system clock generator PLL.
PLL Power Domain
(VDDA_PLL
)
Nominal supply voltage is 1.3 V.
This domain can be powered from the on-chip analog LDO output pin (ANA_LDOO).
This domain powers the power management analog circuits and the 10-bit SAR.
Nominal supply voltage is 1.3 V.
Analog Power Domain
(VDDA_ANA
)
This domain can be powered from the on-chip analog LDO output pin (ANA_LDOO).
Note: When externally powered, this domain must be always powered for proper
operation.
USB Analog Power Domain
(USB_VDDA1P3
This domain powers the USB analog PHY.
)
Nominal supply voltage is 1.3 V. This domain can be powered from on-chip USB_LDO
output pin (USB_LDOO).
USB Digital Power Domain
(USB_VDD1P3
This domain powers the USB digital module.
)
Nominal supply voltage is 1.3 V. This domain can be powered from on-chip USB_LDO
output pin (USB_LDOO).
USB Oscillator Power Domain
(USB_VDDOSC
This domain powers the USB oscillator.
)
Nominal supply voltage is 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
This domain powers the USB transceiver.
USB Transceiver & Analog Power
Domain
Nominal supply voltage is 3.3 V.
(USB_VDDA3P3
)
This domain cannot be powered by internal LDOs, external regulation must be provided.
This domain powers the USB PLL.
USB PLL Power Domain
( USB_VDDPLL
)
Nominal supply voltage is 3.3 V.
This domain cannot be powered by internal LDOs, external regulation must be provided.
This domain powers LDOs, POR comparator, and I/O supply for some pins.
LDOI Power Domain (LDOI)
Nominal supply voltage is 1.8 V through 3.6 V. Note: This domain must be always
powered for proper operation.
1.5.3 Clock Management
As mentioned in Section 1.3.2, there are several clock domains within the DSP. The device supports clock
gating features that allows software to disable clocks to entire clock domains or modules within a domain
in order to reduce the domain's active power consumption to very-near zero (a very small amount of logic
will still see a clock).
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Power Management
There are two distinct methods of clock gating. The first uses the ICR CPU register and the CPU's IDLE
instruction. This method is used for the following domains: CPU, IPORT, DPORT, MPORT, XPORT &
indicating the desired clock gating configuration and then (possibly much later) the IDLE instruction is
executed. The contents of the ICR do not become effective until the IDLE instruction is executed. The
second method uses system registers, PCGCR1 & PCGCR2. These registers control most of the
peripheral clock domains and writes to this register take effect immediately.
The SYSCLKDIS bit in PCGCR register has global effect and, therefore, is a superset of the two methods.
When this bit as asserted the whole device is clock gated with the exceptions of the PLL, the USB PLL,
the RTC, and the oscillators.
NOTE: Stopping clocks to a domain or a module within that domain only affects active power
consumption; it does not affect leakage power consumption.
NOTE: The on-chip Bootloader idles all peripherals and CPU ports at startup, but it enables some
peripherals as it uses them. Application code should not assume all peripherals and CPU
ports are disabled. To get the minimum power consumption, make sure to disable all
peripherals and CPU ports first and then enable only necessary peripherals and CPU ports
before using them.
1.5.3.1 CPU Domain Clock Gating
Two registers are provided to individually configure and monitor the clock gating modes of the CPU
domain: the idle configuration register (ICR) and the idle status register (ISTR).
ICR lets you configure how the CPU domain will respond the next time the idle instruction is executed.
When you execute the idle instruction, the content of ICR is copied to ISTR. Then the ISTR values are
propagated to the different portions of the CPU domain.
In the CPU domain, there are five CPU ports.
•
•
•
•
IPORT: this port is used by the CPU for fetching instructions from external memory.
DPORT: this port is used by the CPU when reading and writing data from/to external memory.
XPORT: this port is used by the CPU when reading and writing from/to IO-space (peripheral) registers.
MPORT: this port is used by the four DMAs, the USB's CDMA, and the LCD controller's DMA when
accessing SARAM or DARAM.
•
•
MPORT: this port is used by the four DMAs and the USB's CDMA when accessing SARAM or
DARAM.
HWA: this port is the hardware accelerator (FFT coprocessor). It shares all CPU buses.
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Power Management
1.5.3.1.1 Idle Configuration Register (ICR) [0001h] and IDLE Status Register (ISTR) [0002h]
Table 1-21 describes the read/write bits of ICR, and Table 1-22 describes the read-only bits of ISTR.
NOTE: To prevent an emulation lock up, idle requests to these domains may be overridden or
ignored when an emulator is connected to the JTAG port of the DSP.
Figure 1-12. Idle Configuration Register (ICR) [0001h]
15
10
9
8
Reserved
R/W-0
HWAI
R/W-0
IPORTI
R/W-0
7
6
5
4
1
0
MPORTI
R/W-0
XPORTI
R/W-0
DPORTI
R/W-0
IDLECFG
R/W-0
CPUI
R/W-0
LEGEND: R/W = Read/Write; -n = value after reset
Table 1-21. Idle Configuration Register (ICR) Field Descriptions
Bit
Field
Value Description
15-10 Reserved
0
Reserved.
9
8
7
HWAI
FFT hardware accelerator idle control bit.
0
1
Hardware accelerator remains active after execution of an IDLE instruction.
Hardware accelerator is disabled after execution of an IDLE instruction.
IPORTI
MPORTI
Instruction port idle control bit. The IPORT is used for all external memory instruction accesses.
IPORT remains active after execution of an IDLE instruction.
0
1
IPORT is disabled after execution of an IDLE instruction.
Memory port idle control bit. The memory port is used for all DMA, LCD DMA, and USB CDMA
transactions into on-chip memory.
0
1
MPORT remains active after execution of an IDLE instruction.
MPORT is disabled after execution of an IDLE instruction.
6
5
XPORTI
DPORTI
I/O port idle control bit. The XPORT is used for all CPU I/O memory transactions.
XPORT remains active after execution of an IDLE instruction.
XPORT is disabled after execution of an IDLE instruction.
0
1
Data port idle control bit. The data port is used for all CPU external memory data accesses.
DPORT remains active after execution of an IDLE instruction.
DPORT is disabled after execution of an IDLE instruction.
0
1
4-1
0
IDLECFG
CPUI
0111b Idle configuration bits. You must always set bit 1, 2 and 3 to 1 and bit 4 to 0 before executing the
idle instruction.
CPU idle control bit.
0
1
CPU remains active after execution of an IDLE instruction.
CPU is disabled after execution of an IDLE instruction.
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15
Power Management
Figure 1-13. Idle Status Register (ISTR) [0002h]
10
9
8
Reserved
R-0
HWAIS
R-0
IPORTIS
R-0
7
6
5
4
1
0
MPORTIS
R-0
XPORTIS
R-0
DPORTIS
R-0
Reserved
R-0
CPUIS
R-0
LEGEND: R = Read only; -n = value after reset
Table 1-22. Idle Status Register (ISTR) Field Descriptions
Bit
Field
Value Description
15-10 Reserved
0
Reserved.
9
8
7
HWAIS
FFT hardware accelerator idle status bit.
Hardware accelerator is active.
Hardware accelerator is disabled.
0
1
IPORTIS
MPORTIS
Instruction port idle status bit. The IPORT is used for all external memory instruction accesses.
0
1
IPORT is active.
IPORT is disabled.
Memory port idle status bit. The memory port is used for all DMA, LCD DMA, and USB CDMA
transactions into on-chip memory.
0
1
MPORT is active.
MPORT is disabled.
6
5
XPORTIS
DPORTIS
I/O port idle status bit. The XPORT is used for all CPU I/O memory transactions.
0
1
XPORT is active.
XPORT is disabled.
Data port idle status bit. The data port is used for all CPU external memory data accesses.
0
1
0
DPORT is active.
DPORT is disabled.
Reserved.
4-1
0
Reserved
CPUIS
CPU idle status bit.
CPU is active.
0
1
CPU is disabled.
1.5.3.1.2 Valid Idle Configurations
Not all of the values that you can write to the idle configuration register (ICR) provide valid idle
configurations. The valid configurations are limited by dependencies within the system. For example, the
IDLECFG bits 1, 2 and 3 of ICR must always be set to 1, and bit 4 must always be cleared to 0. As
another example, the XPORT cannot be idled unless the CPU is also idled. Before any part of the CPU
A bus error will be generated (BERR = 1 in IFR1) if you execute the idle instruction under any of the
following conditions and the idle command will not take effect:
1. If you fail to set IDLECFG = 0111 while setting any of these bits: DPORTI, XPORTI, IPORTI or
MPORTI.
2. If you set DPORTI, XPORTI, or IPORTI without also setting CPUI.
Table 1-23. CPU Clock Domain Idle Requirements
To Idle the Following Module/Port
Requirements Before Going to Idle
CPU
FFT Hardware Accelerator
MPORT
No requirements.
No requirements.
DMA controllers, LCD, and USB CDMA must not be accessing DARAM or SARAM.
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Power Management
Table 1-23. CPU Clock Domain Idle Requirements (continued)
To Idle the Following Module/Port
Requirements Before Going to Idle
XPORT
DPORT
CPU CPUI must also be set.
1.5.3.1.3 Clock Configuration Process
The clock configuration indicates which portions of the CPU clock domain will be idle, and which will be
active. The basic steps to the clock configuration process are:
1. To idle MPORT, DMA controller, LCD DMA, and USB CDMA must not be accessing SARMA or
DARAM. If any DMA is in active, wait for completion of the DMA transfer.
2. Write the desired configuration to the idle configuration register (ICR). Make sure that you use a valid
3. Apply the new idle configuration by executing the IDLE instruction. The content of ICR is copied to the
idle status register (ISTR). The bits of ISTR are then propagated through the CPU domain system to
enable or disable the specified clocks. If the CPU domain was idled, then program execution will stop
immediately after the idle instruction. If the CPU domain was not idled, then program execution will
continue past the idle instruction but the appropriate domains will be idle.
The IDLE instruction cannot be executed in parallel with another instruction.
The CPU, DPORT, XPORT, and IPORT domains are enabled automatically by any unmasked interrupts.
There is a logic in the DSP core that enables CPU, DPORT, XPORT, and IPORT (clears the bits 0, 5, 6,
and 8 of the ISTR register) asynchronously upon detecting an interrupt signal. Therefore, when an
unmasked interrupt signal reaches the DSP core, these domains are un-idled automatically. Once the
CPU is enabled, it takes 3 CPU cycles to detect the interrupt in the IFR. Note that HWA and MPORT have
to be manually enabled after being disabled.
1.5.3.2 Peripheral Domain Clock Gating
The peripheral clock gating allows software to disable clocks to the DSP peripherals, in order to reduce
the peripheral's active power consumption to zero. Aside from the analog logic, the DSP is designed in
static CMOS; thus, when a peripheral clock stops, the peripheral's state is preserved, and no active
current is consumed. When the clock is restarted the peripheral resumes operating from the stopping
point.
NOTE: Stopping clocks to a peripheral only affects active power consumption; it does not affect
leakage power consumption.
If a peripheral's clock is stopped while being accessed, the access may not occur completely, and could
potentially lock-up the device. To avoid this issue, some peripherals have a clock stop request and
acknowledge protocol that allows software to ask the peripheral when it is safe to stop the clocks. This is
described further in Section 1.5.3.2.2. For the peripherals that do not have the request/acknowledge
protocol, the user must ensure that all of the transactions to the peripheral are finished prior to stopping
the clocks.
Some peripherals provide additional power saving features by clock gating components within its
peripheral boundary. See the peripheral-specific user's guide for more details on these additional power
saving features.
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Power Management
1.5.3.2.1 Peripheral Clock Gating Configuration Registers (PCGCR1 and PCGCR2) [1C02 - 1C03h]
The peripheral clock gating configuration registers (PCGRC1 and PCGCR2) are used to disable the clocks
of the DSP peripherals. In contrast to the idle control register (ICR), these bits take effect within 6
SYSCLK cycles and do not require an idle instruction.
The peripheral clock gating configuration register 1 (PCGCR1) is shown in Figure 1-14 and described in
Figure 1-14. Peripheral Clock Gating Configuration Register 1 (PCGCR1) [1C02h]
15
14
13
12
11
10
9
8
SYSCLKDIS
R/W-0
I2S2CG
R/W-0
TMR2CG
R/W-0
TMR1CG
R/W-0
EMIFCG
R/W-0
TMR0CG
R/W-0
I2S1CG
R/W-0
I2S0CG
R/W-0
7
6
5
4
3
2
1
0
MMCSD1CG
R/W-0
I2CCG
R/W-0
Reserved
R/W-0
MMCSD0CG
R/W-0
DMA0CG
R/W-0
UARTCG
R/W-0
SPICG
R/W-0
I2S3CG
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-24. Peripheral Clock Gating Configuration Register 1 (PCGCR1) Field Descriptions
Bit
Field
Value Description
System clock disable bit. This bit can be used to turn off the system clock. Setting the WAKEUP pin
15
SYSCLKDIS
high enables the system clock. Since the WAKEUP pin is used to re-enable the system clock, the
WAKEUP pin must be low to disable the system clock.
NOTE Disabling the system clock disables the clock to most parts of the DSP, including the CPU.
0
1
System clock is active.
System clock is disabled.
14
13
12
11
I2S2CG
I2S2 clock gate control bit. This bit is used to enable and disable the I2S2 peripheral clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
TMR2CG
TMR1CG
EMIFCG
Timer 2 clock gate control bit. This bit is used to enable and disable the Timer 2 peripheral clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
Timer 1 clock gate control bit. This bit is used to enable and disable the Timer 1 peripheral clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
EMIF clock gate control bit. This bit is used to enable and disable the EMIF peripheral clock. NOTE
You must request permission before stopping the EMIF clock through the peripheral clock stop
request/acknowledge register (CLKSTOP).
0
1
Peripheral clock is active.
Peripheral clock is disabled.
10
9
TMR0CG
I2S1CG
Timer 0 clock gate control bit. This bit is used to enable and disable the Timer 0 peripheral clock.
Peripheral clock is active.
0
1
Peripheral clock is disabled.
I2S1 clock gate control bit. This bit is used to enable and disable the I2S1 peripheral clock.
Peripheral clock is active.
0
1
Peripheral clock is disabled.
8
I2S0CG
I2S0 clock gate control bit. This bit is used to enable and disable the I2S0 peripheral clock.
Peripheral clock is active.
0
1
Peripheral clock is disabled.
7
MMCSD1CG
MMC/SD1 clock gate control bit. This bit is used to enable and disable the MMC/SD1 peripheral
clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
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Power Management
Table 1-24. Peripheral Clock Gating Configuration Register 1 (PCGCR1) Field Descriptions (continued)
Bit
Field
Value Description
I2C clock gate control bit. This bit is used to enable and disable the I2C peripheral clock.
6
I2CCG
0
1
0
Peripheral clock is active.
Peripheral clock is disabled.
5
4
Reserved
Reserved, you must always write 1 to this bit.
MMCSD0CG
MMC/SD0 clock gate control bit. This bit is used to enable and disable the MMC/SD0 peripheral
clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
3
2
DMA0CG
UARTCG
DMA controller 0 clock gate control bit. This bit is used to enable and disable the peripheral clock
the DMA controller 0.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
UART clock gate control bit. This bit is used to enable and disable the UART peripheral clock.
NOTE You must request permission before stopping the UART clock through the peripheral clock
stop request/acknowledge register (CLKSTOP).
0
1
Peripheral clock is active.
Peripheral clock is disabled.
1
0
SPICG
SPI clock gate control bit. This bit is used to enable and disable the SPI controller peripheral clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
I2S3CG
I2S3 clock gate control bit. This bit is used to enable and disable the I2S3 peripheral clock.
Peripheral clock is active.
0
1
Peripheral clock is disabled.
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Power Management
The peripheral clock gating configuration register 2 (PCGCR2) is shown in Figure 1-15 and described in
Figure 1-15. Peripheral Clock Gating Configuration Register 2 (PCGCR2) [1C03h]
15
8
Reserved
R-0
7
6
5
4
3
2
1
0
Reserved
R-0
ANAREGCG
R/W-0
DMA3CG
R/W-0
DMA2CG
R/W-0
DMA1CG
R/W-0
USBCG
R/W-0
SARCG
R/W-0
LCDCG
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-25. Peripheral Clock Gating Configuration Register 2 (PCGCR2) Field Descriptions
Bit
15-7
6
Field
Value Description
Reserved
0
Reserved.
ANAREGCG
Analog registers clock gate control bit. This bit is used to enable and disable the clock to the
registers that control the analog domain of the device, i.e. registers in the 7000h-70FFh I/O space
address range. NOTE When SARCG = 0, the clocks to the analog domain registers are enabled
regardless of the ANAREGCG setting.
0
1
Clock is active.
Clock is disabled.
5
4
3
2
DMA3CG
DMA2CG
DMA1CG
USBCG
DMA controller 3 clock gate control bit. This bit is used to enable and disable the DMA controller 3
peripheral clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
DMA controller 2 clock gate control bit. This bit is used to enable and disable the DMA controller 2
peripheral clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
DMA controller 1 clock gate control bit. This bit is used to enable and disable the DMA controller 1
peripheral clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
USB clock gate control bit. This bit is used to enable and disable the USB controller peripheral
clock. NOTE You must request permission before stopping the USB clock through the peripheral
clock stop request/acknowledge register (CLKSTOP). This register does not stop the USB PLL.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
1
0
SARCG
LCDCG
SAR clock gate control bit. This bit is used to enable and disable the SAR peripheral clock. NOTE
When SARCG = 0, the clock to the analog domain registers is enabled regardless of the
ANAREGCG setting.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
LCD controller clock gate control bit. This bit is used to enable and disable the LCD controller
peripheral clock.
0
1
Peripheral clock is active.
Peripheral clock is disabled.
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Power Management
1.5.3.2.2 Peripheral Clock Stop Request/Acknowledge Register (CLKSTOP) [1C3Ah]
You must execute a handshaking procedure before stopping the clock to the EMIF, USB, and UART. This
handshake procedure ensures that current bus transactions are completed before the clock is stopped.
The peripheral clock stop request/acknowledge register (CLKSTOP) enables this handshaking
mechanism.
To stop the clock to the EMIF, USB, or UART, set the corresponding clock stop request bit in the
CLKSTOP register, then wait for the peripheral to set the corresponding clock stop acknowledge bit. Once
this bit is set, you can idle the corresponding clock in the PCGCR1 and PCGCR2.
To enable the clock to the EMIF, USB, or UART, first enable the clock the peripheral through PCGCR1 or
PCGCR2, then clear the corresponding clock stop request bit in the CLKSTOP register.
Figure 1-16. Peripheral Clock Stop Request/Acknowledge Register (CLKSTOP) [1C3Ah]
15
8
Reserved
R-0
7
6
5
4
3
2
1
0
Reserved
R-0
URTCLKSTPACK URTCLKSTPREQ USBCLKSTPACK USBCLKSTPREQ EMFCLKSTPACK EMFCLKSTPREQ
R-1
R/W-1
R-1
R/W-1
R-1
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-26. Peripheral Clock Stop Request/Acknowledge Register (CLKSTOP) Field Descriptions
Bit
15-6
5
Field
Value Description
Reserved
0
Reserved.
URTCLKSTPACK
UART clock stop acknowledge bit. This bit is set to 1 when the UART has acknowledged
a request for its clock to be stopped. The UART clock should not be stopped until this bit
is set to 1.
0
1
The request to stop the peripheral clock has not been acknowledged.
The request to stop the peripheral clock has been acknowledged, the clock can be
stopped.
4
URTCLKSTPREQ
UART peripheral clock stop request bit. When disabling the UART internal peripheral
clock, you must set this bit to 1 to request permission to stop the clock. After the UART
acknowledges the request (URTCLKSTPACK = 1) you can stop the clock through the
peripheral clock gating control register 1 (PCGCR1). When enabling the UART internal
clock, enable the clock through PCGCR1, then set URTCKLSTPREQ to 0.
0
1
Normal operating mode.
Request permission to stop the peripheral clock.
3
2
USBCLKSTPACK
USBCLKSTPREQ
USB clock stop acknowledge bit. This bit is set to 1 when the USB has acknowledged a
request for its clock to be stopped. The USB clock should not be stopped until this bit is
set to 1.
0
1
The request to stop the peripheral clock has not been acknowledged.
The request to stop the peripheral clock has been acknowledged, the clock can be
stopped.
USB peripheral clock stop request bit. When disabling the USB internal peripheral clock,
you must set this bit to 1 to request permission to stop the clock. After the USB
acknowledges the request (USBCLKSTPACK = 1) you can stop the clock through the
peripheral clock gating control register 2 (PCGCR2). When enabling the USB internal
clock, enable the clock through PCGCR2, then set USBCKLSTPREQ to 0.
0
1
Normal operating mode.
Request permission to stop the peripheral clock.
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Power Management
Table 1-26. Peripheral Clock Stop Request/Acknowledge Register (CLKSTOP) Field Descriptions
(continued)
Bit
Field
Value Description
1
EMFCLKSTPACK
EMIF clock stop acknowledge bit. This bit is set to 1 when the EMIF has acknowledged a
request for its clock to be stopped. The EMIF clock should not be stopped until this bit is
set to 1.
0
1
The request to stop the peripheral clock has not been acknowledged.
The request to stop the peripheral clock has been acknowledged, the clock can be
stopped.
0
EMFCLKSTPREQ
EMIF peripheral clock stop request bit. When disabling the EMIF internal peripheral clock,
you must set this bit to 1 to request permission to stop the clock. After the EMIF
acknowledges the request (EMFCLKSTPACK = 1) you can stop the clock through the
peripheral clock gating control register 1 (PCGCR1). When enabling the EMIF internal
clock, enable the clock through PCGCR1, then set EMFCKLSTPREQ to 0.
0
1
Normal operating mode.
Request permission to stop the peripheral clock.
1.5.3.2.3 Clock Configuration Process
The clock configuration indicates which portions of the peripheral clock domain will be idle, and which will
be active. The basic steps to the clock configuration process are:
1. Wait for completion of all DMA transfers. You can poll the DMA transfer status and disable DMA
transfers through the DMA registers.
2. If idling the EMIF, USB, and UART clock, set the corresponding clock stop request bit in CLKSTOP.
3. Wait for confirmation from the module that its clock can be stopped by polling the clock stop
acknowledge bits of CLKSTOP.
4. Set the clock configuration for the peripheral domain through PCGCR1 and PCGCR2. The clock
configuration takes place as soon as you write to these registers; the idle instruction is not required
1.5.3.3 Clock Generator Domain Clock Gating
To save power, the system clock generator can be placed in its BYPASS MODE and its PLL can be
placed in power down mode. When the system clock generator is in the BYPASS MODE, the clock
generator is not used and the system clock (SYSCLK) is driven by either the CLKIN pin or the real-time
clock (RTC). For more information entering and exiting the bypass mode of the clock generator, see
When the clock generator is placed in its bypass mode, the PLL continues to generate a clock output. You
powering down the PLL.
1.5.3.4 USB Domain Clock Gating
The USB peripheral has two clock domains. The first is a high speed domain that has its clock supplied by
a dedicated USB PLL. The reference clock for the USB PLL is the 12.0 MHz USB oscillator. The clock
output from the PLL must support the serial data stream that, in high-speed mode, is at a rate of 480
Mb/s. The second clock into the USB peripheral handles the data once it has been packetized and
transported in parallel fashion. This clock supports all of the USB registers, CDMA, FIFO, etc., and is
clocked by SYSCLK. In order to keep up with the serial data stream, the USB requires SYSCLK to be at
least 30 MHz for low-speed/full-speed modes and at least 60 MHz for high-speed mode.
By stopping both of these clocks, it is possible to reduce the USB's active power consumption (in the
digital logic) to zero.
NOTE: Stopping clocks to a peripheral only affects active power consumption; it does not affect
leakage power consumption. USB leakage power consumption can be reduced to zero by
not powering the USB.
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Power Management
1.5.3.4.1 Clock Configuration Process
The clock configuration process for the USB clock domain consists of disabling the USB peripheral clock
followed by disabling the USB on-chip oscillator. This procedure will completely shut off USB module,
which does not comply with USB suspend/resume protocol.
To set the clock configuration of the USB clock domain to idle follow these steps:
1. Set the SUSPENDM bit in FADDR register. For more information about the SUSPENDM bit, see the
2. Set the USB clock stop request bit (USBCLKSTREQ) in the CLKSTOP register to request permission
to shut off the USB peripheral clock.
3. Wait until the USB acknowledges the clock stop request by polling the USB clock stop acknowledge bit
(USBCLKSTPACK) in the CLKSTOP register.
4. Disable the USB peripheral clock by setting USBCG = 1 in the peripheral clock gating control register 2
(PCGCR2).
5. Disable the USB oscillator by setting USBOSCDIS = 1 in the USB system control register (USBSCR).
To enable the USB clock domain, follow these steps:
1. Enable the USB oscillator by setting USBOSCDIS = 0 in USBSCR.
2. Wait for the oscillator to stabilize. Refer to the device-specific data manual for oscillator stabilization
time.
3. Enable the USB peripheral clock by setting USBCG = 0 in the peripheral clock gating control register 2
(PCGCR2).
4. Clear the USB clock stop request bit (USBCLKSTREQ) in the CLKSTOP register.
5. Clear the SUSPENDM bit in FADDR register.
1.5.3.4.2 USB System Control Register (USBSCR) [1C32h]
The USB system control register is used to disable the USB on-chip oscillator and to power-down the
USB.
Figure 1-17. USB System Control Register (USBSCR) [1C32h]
15
14
13
12
11
8
0
USBPWDN
R/W-1
USBSESSEND USBVBUSDET
USBPLLEN
R/W-0
Reserved
R-0
R/W-0
R/W-1
5
7
6
4
3
2
1
Reserved
R-0
USBDATPOL
R/W-1
Reserved
USBOSCBIASDIS
R/W-1
USBOSCDIS
R/W-1
BYTEMODE
R/W-0
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-27. USB System Control Register (USBSCR) Field Descriptions
Bit
Field
Value Description
15
USBPWDN
USB module power. Asserting USBPWDN puts the USB PHY and PLL in their lowest
power state. The USB peripheral is not operational in this state.
0
1
USB module is powered.
USB module is powered-down.
14
USBSESSEND
USB VBUS session end comparator enable. The USB VBUS pin has two comparators
that monitor the voltage level on the pin. These comparators can be disabled for power
savings when not needed.
0
1
USB VBUS session end comparator is disabled.
USB VBUS session end comparator is enabled.
44
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
Power Management
Table 1-27. USB System Control Register (USBSCR) Field Descriptions (continued)
Bit
Field
Value Description
13
USBVBUSDET
USB VBUS detect enable. The USB VBUS pin has two comparators that monitor the
voltage level on the pin. These comparators can be disabled for power savings when not
needed.
0
1
USB VBUS detect comparator is disabled.
USB VBUS detect comparator is enabled.
12
USBPLLEN
USB PLL enable. This is normally only used for test purposes.
Normal USB operation.
0
1
0
Override USB suspend end behavior and force release of PLL from suspend state.
Reserved. Always write 0 to these bits.
11-7
6
Reserved
USBDATPOL
USB data polarity bit. Changing this bit can be useful since the data polarity is opposite
on type-A and type-B connectors.
0
1
0
Reverse polarity on DP and DM signals.
Normal polarity (normal polarity matching pin names).
Reserved.
5-4
3
Reserved
USBOSCBIASDIS
USB internal oscillator bias resistor disable.
Internal oscillator bias resistor enabled (normal operating mode).
0
1
Internal oscillator bias resistor disabled. Disabling the internal resistor is primarily for
production test purposes. But it can also be used when an external oscillator bias resistor
is connected between the USB_MXI and USB_MXO pins (but this is not a recommended
configuration).
2
USBOSCDIS
BYTEMODE
USB oscillator disable bit.
0
1
USB internal oscillator enabled.
USB internal oscillator disabled. Causes the USB_MXO pin to be tristated and the
oscillator's clock into the core is forced low.
1-0
USB byte mode select bits.
0
Word accesses by the CPU are allowed.
Byte accesses by the CPU are allowed (high byte is selected).
Byte accesses by the CPU are allowed (low byte is selected).
Reserved.
1h
2h
3h
1.5.3.5 RTC Domain Clock Gating
Dynamic RTC domain clock gating is not supported. Note that the RTC oscillator, and by extension the
RTC domain, can be permanently disabled by not connecting a crystal and tying off the RTC oscillator
pins. However, in this configuration, the RTC must still be powered and the RTC registers starting at I/O
address 1900h will not be accessible. This includes the RTC Power Management Register (RTCPMGT)
that provides powerdown control to the on-chip LDO and control of the WAKEUP and RTC_CLKOUT pins.
See the device-specific data manual for more details on permanently disabling the RTC oscillator.
45
SPRUFX5A–October 2010–Revised November 2010
System Control
Copyright © 2010, Texas Instruments Incorporated
Power Management
1.5.4 Static Power Management
1.5.4.1 RTC Power Management Register (RTCPMGT) [1930h]
This register enables static power management with power down and wake up register bits as described
in the device-specific data sheet and, more generally, below. The RTC power management register
Figure 1-18. RTC Power Management Register (RTCPMGT) [1930h]
15
5
4
3
2
1
0
Reserved
WU_DOUT
WU_DIR
BG_PD
LDO_PD
RTCCLKOUTEN
R-0
RW-0
RW-0
RW-0
RW-0
RW-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-28. RTC Power Management Register (RTCPMGT) Field Descriptions
Bit
15-5
4
Field
Value Description
Reserved
WU_DOUT
0
Reserved
Wakeup output, active low/Open-drain.
WAKEUP pin driven low.
0
1
WAKEUP pin driver is in high impedance.
Wakeup pin direction control.
WAKEUP pin is configured as input.
WAKEUP pin is configured as output.
3
2
WU_DIR
BG_PD
0
1
NOTE: The WAKEUP pin, when configured as an input, is active high. When it is configured as an
output, it is open-drain and thus it should have an external pull-up and it is active low.
Powerdown control bit for the bandgap, on-chip LDOs, and the analog POR (power on reset)
comparator. This bit shuts down the on-chip LDOs (ANA_LDO, DSP_LDO, and USB_LDO), the
Analog POR, and Bandgap reference. BG_PD and LDO_PD are only intended to be used when the
internal LDOs supply power to the chip. If the internal LDOs are bypassed and not used then the
BG_PD and LDO_PD power down mechanisms should not be used since the POR gets powered
down and the POWERGOOD signal would not get generated properly.
After this bit is asserted, the on-chip LDOs, Analog POR, and the Bandgap reference can only be
re-enabled by the WAKEUP pin (being driven HIGH externally) or an enabled RTC alarm or an
enabled RTC periodic event interrupt. Once reenabled, the Bandgap circuit takes about 100 msec to
charge the external 0.1 mF capacitor on the BG_CAP pin via the the internal resistance of
aproxmiately. 320 kΩ.
0
1
On-chip LDOs, Analog POR, and Bandgap reference are enabled.
On-chip LDOs, Analog POR, and Bandgap reference are disabled (shutdown).
1
LDO_PD
On-chip LDOs and Analog POR power down bit. This bit shuts down the on-chip LDOs (ANA_LDO,
DSP_LDO, and USB_LDO) and the Analog POR. BG_PD and LDO_PD are only intended to be
used when the internal LDOs supply power to the chip. If the internal LDOs are bypassed and not
used then the BG_PD and LDO_PD power down mechanisms should not be used since POR gets
powered down and the POWERGOOD signal is not generated properly.
After this bit is asserted, the on-chip LDOs and Analog POR can only be re-enabled by the
WAKEUP pin (being driven HIGH externally) or an enabled RTC alarm or an enabled RTC periodic
event interrupt. This bit keeps the Bandgap reference turned on to allow a faster wake-up time with
the expense power consumption of the Bandgap reference.
0
1
On-chip LDOs and Analog POR are enabled.
On-chip LDOs and Analog POR are disabled (shutdown).
Clock-out output enable.
0
RTCCLKOUTEN
0
1
Clock output disabled.
Clock output enabled.
46
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
Power Management
1.5.4.2 RTC Interrupt Flag Register (RTCINTFL) [1920h]
Figure 1-19. RTC Interrupt Flag Register (RTCINTFL) [1920h]
15
14
6
8
ALARMFL
R-0
Reserved
R-0
7
5
4
3
2
1
0
Reserved
R-0
EXTFL
R-0
DAYFL
R-0
HOURFL
R-0
MINFL
R-0
SECFL
R-0
MSFL
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-29. RTC Interrupt Flag Register (RTCINTFL) Field Descriptions
Bit
Field
Value Description
15
ALARMFL
Indicates that an alarm interrupt has been generated.
0
1
0
Alarm interrupt did not occur.
Alarm interrupt occurred (write 1 to clear).
Reserved.
14-6
5
Reserved
EXTFL
External event (WAKEUP pin assertion) has occurred.
External event interrupt has not occurred.
External event interrupt occurred (write 1 to clear).
Day event has occurred.
0
1
4
3
2
1
0
DAYFL
HOURFL
MINFL
SECFL
MSFL
0
1
Periodic Day event has not occurred.
Periodic Day event occurred (write 1 to clear).
Hour event has occurred.
0
1
Periodic Hour event has not occurred.
Periodic Hour event occurred (write 1 to clear).
Minute Event has occurred.
0
1
Periodic Minute event has not occurred.
Periodic Minute event occurred (write 1 to clear).
Second Event occurred.
0
1
Periodic Second event has not occurred.
Periodic Second event occurred (write 1 to clear).
Millisecond event occurred.
0
1
Periodic Millisecond event has not occurred.
Periodic Millisecond event occurred (write 1 to clear).
47
SPRUFX5A–October 2010–Revised November 2010
System Control
Copyright © 2010, Texas Instruments Incorporated
Power Management
1.5.4.3 Internal Memory Low Power Modes
To save power, software can place on-chip memory (DARAM or SARAM) in one of two power modes:
memory retention mode and active mode. These power modes are activated through the SLPZVDD and
memory retention mode, set SLPZVDD bit and clear SLPZVSS bit of each memory bank to be put in
retention mode. The retention/active mode of each 4kW DARAM and SARAM bank is independently
controllable.
When either type of memory is placed in memory retention, read and write accesses are not allowed. In
memory retention mode, the memory is placed in a low power mode while maintaining its contents. The
contents are retained as long as there are no access attempts to that memory. In active mode, the
memory is readily accessible by the CPU, but consumes more leakage power.
For the entire duration that the memory is in retention mode, there can be no attempts to read or write to
the memories address range. This includes accesses by the CPU or any DMA. If an access is attempted
while in retention mode then the memory contents will be lost.
NOTE: You must wait at least 10 CPU clock cycles after taking memory out of a low power mode
before initiating any read or write access.
Table 1-30 summarizes the power modes for both DARAM and SARAM.
Table 1-30. On-Chip Memory Standby Modes
SLPZVDD
SLPZVSS
Mode
CVDD Voltage
1
1
Active
1.05 V or 1.3 V
- Normal operational mode
- Read and write accesses are allowed
Retention
1
0
0
0
1.05 V or 1.3 V
1.05 V or 1.3 V
- Low power mode
- Contents are retained
- No read or write access is allowed
Memory Disabled Mode
- Lowest leakage mode
- Contents are lost
- No read or write access is allowed
1.5.4.3.1 RAM Sleep Mode Control Register 1 (RAMSLPMDCNTLR1) [1C28h]
Figure 1-20. RAM Sleep Mode Control Register1 [0x1C28]
15
14
13
12
11
10
9
8
DARAM7
SLPZVDD
DARAM7
SLPZVSS
DARAM6
SLPZVDD
DARAM6
SLPZVSS
DARAM5
SLPZVDD
DARAM5
SLPZVSS
DARAM4
SLPZVDD
DARAM4
SLPZVSS
R/W+1
7
R/W+1
6
R/W+1
5
R/W+1
4
R/W+1
3
R/W+1
2
R/W+1
1
R/W+1
0
DARAM3
SLPZVDD
DARAM3
SLPZVSS
DARAM2
SLPZVDD
DARAM2
SLPZVSS
DARAM1
SLPZVDD
DARAM1
SLPZVSS
DARAM0
SLPZVDD
DARAM0
SLPZVSS
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
48
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
15
Power Management
Figure 1-21. RAM Sleep Mode Control Register2 [0x1C2A]
14
13
12
11
10
9
8
SARAM7
SLPZVDD
SARAM7
SLPZVSS
SARAM6
SLPZVDD
SARAM6
SLPZVSS
SARAM5
SLPZVDD
SARAM5
SLPZVSS
SARAM4
SLPZVDD
SARAM4
SLPZVSS
R/W+1
7
R/W+1
6
R/W+1
5
R/W+1
4
R/W+1
3
R/W+1
2
R/W+1
1
R/W+1
0
SARAM3
SLPZVDD
SARAM3
SLPZVSS
SARAM2
SLPZVDD
SARAM2
SLPZVSS
SARAM1
SLPZVDD
SARAM1
SLPZVSS
SARAM0
SLPZVDD
SARAM0
SLPZVSS
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 1-22. RAM Sleep Mode Control Register3 [0x1C2B]
15
14
13
12
11
10
9
8
SARAM15
SLPZVDD
SARAM15
SLPZVSS
SARAM14
SLPZVDD
SARAM14
SLPZVSS
SARAM13
SLPZVDD
SARAM13
SLPZVSS
SARAM12
SLPZVDD
SARAM12
SLPZVSS
R/W+1
7
R/W+1
6
R/W+1
5
R/W+1
4
R/W+1
3
R/W+1
2
R/W+1
1
R/W+1
0
SARAM11
SLPZVDD
SARAM11
SLPZVSS
SARAM10
SLPZVDD
SARAM10
SLPZVSS
SARAM9
SLPZVDD
SARAM9
SLPZVSS
SARAM8
SLPZVDD
SARAM8
SLPZVSS
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 1-23. RAM Sleep Mode Control Register4 [0x1C2C]
15
14
13
12
11
10
9
8
SARAM23
SLPZVDD
SARAM23
SLPZVSS
SARAM22
SLPZVDD
SARAM22
SLPZVSS
SARAM21
SLPZVDD
SARAM21
SLPZVSS
SARAM20
SLPZVDD
SARAM20
SLPZVSS
R/W+1
7
R/W+1
6
R/W+1
5
R/W+1
4
R/W+1
3
R/W+1
2
R/W+1
1
R/W+1
0
SARAM19
SLPZVDD
SARAM19
SLPZVSS
SARAM18
SLPZVDD
SARAM18
SLPZVSS
SARAM17
SLPZVDD
SARAM17
SLPZVSS
SARAM16
SLPZVDD
SARAM16
SLPZVSS
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 1-24. RAM Sleep Mode Control Register5 [0x1C2D]
15
14
13
12
11
10
9
8
SARAM31
SLPZVDD
SARAM31
SLPZVSS
SARAM30
SLPZVDD
SARAM30
SLPZVSS
SARAM29
SLPZVDD
SARAM29
SLPZVSS
SARAM28
SLPZVDD
SARAM28
SLPZVSS
R/W+1
7
R/W+1
6
R/W+1
5
R/W+1
4
R/W+1
3
R/W+1
2
R/W+1
1
R/W+1
0
SARAM27
SLPZVDD
SARAM27
SLPZVSS
SARAM26
SLPZVDD
SARAM26
SLPZVSS
SARAM25
SLPZVDD
SARAM25
SLPZVSS
SARAM24
SLPZVDD
SARAM24
SLPZVSS
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
R/W+1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
49
SPRUFX5A–October 2010–Revised November 2010
System Control
Copyright © 2010, Texas Instruments Incorporated
Power Management
1.5.5 Power Configurations
The power-saving features described in the previous sections, such as peripheral clock gating, and
on-chip memory power down to name a few, can be combined to form a power configuration. Many
different power configurations can be created by enabling and disabling different power domains and clock
domains, however, this section defines some basic power configurations that may be useful. These are
shown and described in Table 1-31. Please note that there is no single instruction or register that can
place the device in these power configurations. Instead, these power configurations are achieved by
modifying multiple registers.
NOTE: Before you change the power configuration, make sure that there is a method for the device
to exit the power configuration. After exiting a power configuration, your software may have
to take additional steps to change the clock and power configuration for other domains.
NOTE: The on-chip Bootloader idles all peripherals and CPU ports at startup. It enables some
peripherals as it uses them. Your application code should check the idle configuration of
peripherals and CPU ports before using them to be sure these are not idle.
Table 1-31. Power Configurations
Steps to Enter Clock Available Methods for
Power
Configuration
Power Domain
State
and Power
Configuration
Changing/Exiting Clock and
Power Configuration
Clock Domain State
RTC only mode
DVDDRTC, LDOI,
and CVDDRTC
powered all others
powered-down
Only RTC clock is
running
Set LDO_PD and
BG_PD bits in
RTCPMGT register
A. RTC interrupt
B. WAKEUP pin
IDLE3
All power domains RTC clock domain
Idle peripheral domain A. WAKEUP pin
Idle CPU domain B. RTC interrupt
on
enabled
Other clock domains
disabled. Clock
generator domain
disabled (BYPASS
MODE and PLL
powerdown).
PLL in BYPASS MODE C. External hardware interrupt (INT0
PLL powerdown
or INT1).
Master clock disable
Execute idle instruction
D. Hardware Reset
IDLE2
All power domains RTC clock domain
on enabled
Idle peripheral domains A. WAKEUP pin
Clock generator domain Idle CPU domain
enabled (PLL_MODE)
B. RTC interrupt
Other clock domains
disabled
Execute idle instruction C. External hardware interrupt
(INT0, INT1).
D. Any unmasked peripheral
interrupt.
E. Hardware Reset
Active
All power domains All clock domains
on enabled
Turn on all power
domains
Enable all clock
domains
50
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
Power Management
1.5.5.1 IDLE2 Procedure
In this power configuration all the power domains are turned on, the RTC and clock generator domains are
enabled, the CPU domain is disabled, and the DSP peripherals are disabled. When you enter this power
configuration all CPU and peripheral activity in the DSP is stopped. Leaving the clock generator domain
enabled allows the DSP to quickly exit this power configuration since there is no need to wait for power
domains to turn on or for the PLL to re-lock.
Follow these steps to enter the IDLE2 power configuration:
1. Wait for completion of all DMA transfers. You can poll the DMA transfer status and disable DMA
transfers through the DMA registers.
3. Idle all the desired peripherals in the peripheral clock domain by modifying the peripheral clock gating
DSP peripherals to idle mode.
4. Clear all interrupts by writing ones to the CPU interrupt flag registers (IFR0 and IFR1).
5. Enable the appropriate wake-up interrupt in the CPU interrupt enable registers (IER0 and IER1). If
using the WAKEUP pin to exit this mode, configure the WAKEUP pin as input by setting WU_DIR = 1
in the RTC power management register (RTCPMGT). If using the RTC alarm or periodic interrupt as a
wake-up event, the RTCINTEN bit must be set in the RTC interrupt enable register (RTCINTEN).
6. Disable the CPU domain by setting to 1 the CPUI, MPORTI, XPORTI, DPORTI, IPORTI, and CPI bits
of the idle configuration register (ICR). Note that the MPORT will not go into idle mode if the USB
CDMA, LCD or DMA controllers is not idled.
7. Apply the new idle configuration by executing the “IDLE” instruction. The content of ICR is copied to
the idle status register (ISTR). The bits of ISTR are then propagated through the CPU domain system
to enable or disable the specified clocks.
The IDLE instruction cannot be executed in parallel with another instruction.
To exit the IDLE2 power configuration, follow these steps:
1. Generate the wake-up interrupt you specified during the IDLE2 power down procedure.
2. After the interrupt is generated, the DSP will execute the interrupt service routine.
3. After exiting the interrupt service routine, code execution will resume from the point where the “IDLE”
instruction was originally executed.
You can also exit the IDLE2 power configuration by generating a hardware reset. However, in this case,
the DSP is completely reset and the state of the DSP before going into IDLE2 is lost.
51
SPRUFX5A–October 2010–Revised November 2010
System Control
Copyright © 2010, Texas Instruments Incorporated
Power Management
1.5.5.2 IDLE3 Procedure
In this power configuration all the power domains are turned on, the CPU and clock generator domains
are disabled, and the RTC clock domain is enabled. The DSP peripherals and the USB are also disabled
in this mode. When you enter this power configuration, all CPU and peripheral activity in the DSP is
stopped.
Since the clock generator domain is disabled, you must allow enough time for the PLL to re-lock before
exiting this power configuration.
Follow these steps to enter the IDLE3 power configuration:
1. Wait for completion of all DMA transfers. You can poll the DMA transfer status and disable DMA
transfers through the DMA registers.
3. Idle all the desired peripherals in the peripheral clock domain by modifying the peripheral clock gating
DSP peripherals to idle mode.
5. Clear all interrupts by writing ones to the CPU interrupt flag registers (IFR0 and IFR1).
6. Enable the appropriate wake-up interrupt in the CPU interrupt enable registers (IER0 and IER1). If
using the WAKEUP pin to exit this mode, configure the WAKEUP pin as input by setting WU_DIR = 1
in the RTC power management register (RTCPMGT). If using the RTC alarm or periodic interrupt as a
wake-up event, the RTCINTEN bit must be set in the RTC interrupt enable register (RTCINTEN).
7. Disable the CPU domain by setting to 1 the CPUI, MPORTI, XPORTI, DPORTI, IPORTI, and CPI bits
of the idle configuration register (ICR).
8. Apply the new idle configuration by executing the IDLE instruction. The content of ICR is copied to the
idle status register (ISTR). The bits of ISTR are then propagated through the CPU domain system to
enable or disable the specified clocks.
The IDLE instruction cannot be executed in parallel with another instruction.
To exit the IDLE3 power configuration, follow these steps:
1. Generate the wake-up interrupt you specified during the IDLE3 power down procedure.
2. After the interrupt is generated, the DSP will execute the interrupt service routine.
3. After exiting the interrupt service routine, code execution will resume from the point where the “IDLE”
instruction was originally executed.
generator domain inside the interrupt service routine.
You can also exit the IDLE3 power configuration by generating a hardware reset, however, in this case the
DSP is completely reset and the state of the DSP before going into IDLE3 is lost.
1.5.5.3 Core Voltage Scaling
When the core voltage domain (CVDD) is ON, it can be set to two voltages: 1.3 V or 1.05 V (nominal). The
core voltage can be reduced during periods of low processing demand and increased during high
demand. Core voltage scaling can be accomplished with an external power management IC (LDO,
DC-DC, etc) or with the on-chip DSP_LDO. When the core voltage is decreased (1.3 V to 1.05 V), care
must be taken to ensure device stability. The following rules must be followed to maintain stability:
•
When using an external PMIC (power management IC), the board designer must ensure that the 1.3 V
to 1.05 V transition does not have ringing that would violate our VDDC minimum rating (1.05 V - 5% =
0.998 V).
•
Software must ensure that the clock speed of the device does not exceed the maximum speed of the
device at the lower voltage before making the voltage transition. For example, if the device is running
at 100 MHz @ 1.3 V, then the PLL must be changed to 60 MHz (for -100 parts) or 75 MHz (for -120
parts) before changing the core voltage to 1.05 V.
52
System Control
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Copyright © 2010, Texas Instruments Incorporated
Interrupts
When the core voltage is increased (1.05 V to 1.3 V) clock speed is not an issue since the device can
operate faster at the higher voltage. However, when switching from 1.05 V to 1.3 V software must allow
time for the voltage transition to reach the 1.3 V range. Additionally, external regulators might produce an
overshoot that must not pass the maximum operational voltage of the core supply (see the Recommended
Operating Conditions section in device-specific data manual). Otherwise, the device will be operating out
of specification. This could happen if large current draw occurs while the regulator transitions to the higher
voltage.
For external PMICs, the step response varies greatly and it is up to the system designer to ensure that the
ringing is maintained within the DSP's core supply high voltage operational tolerance (see the
Recommended Operating Conditions section in device-specific data manual).
1.6 Interrupts
Vector-relative locations and priorities for all internal and external interrupts are shown in Table 1-32.
Table 1-32. Interrupt Table
SOFTWARE
(TRAP)
EQUIVALENT
RELATIVE
LOCATION
(HEX BYTES)
NAME
PRIORITY
FUNCTION
(1)
RESET
NMI(2)
INT0
SINT0
SINT1
SINT2
SINT3
SINT4
SINT5
0x0
0x8
0
1
3
5
6
7
Reset (hardware and software)
Non-maskable interrupt
External user interrupt #0
External user interrupt #1
Timer aggregated interrupt
0x10
0x18
0x20
0x28
INT1
TINT
PROG0
Programmable transmit interrupt 0 (I2S0 transmit or
MMC/SD0 interrupt)
UART
SINT6
SINT7
0x30
0x38
9
UART interrupt
PROG1
10
Programmable receive interrupt 1 (I2S0 receive or
MMC/SD0 SDIO interrupt)
DMA
SINT8
SINT9
0x40
0x48
11
13
DMA aggregated interrupt
PROG2
Programmable transmit interrupt 1 (I2S1 transmit or
MMC/SD1 interrupt)
-
SINT10
SINT11
0x50
0x58
14
15
Software interrupt
PROG3
Programmable receive interrupt 3 (I2S1 Receive or
MMC/SD1 SDIO interrupt)
LCD
SAR
XMT2
RCV2
XMT3
RCV3
RTC
SPI
SINT12
SINT13
SINT14
SINT15
SINT16
SINT17
SINT18
SINT19
SINT20
SINT21
SINT22
SINT23
SINT24
SINT25
SINT26
SINT27
0x60
0x68
0x70
0x78
0x80
0x88
0x90
0x98
0xA0
0xA8
0xB0
0xB8
0xC0
0xC8
0xD0
0xD8
17
18
21
22
4
LCD interrupt
10-bit SAR A/D conversion or pin interrupt
I2S2 transmit interrupt
I2S2 receive interrupt
I2S3 transmit interrupt
I2S3 receive interrupt
Wakeup or real-time clock interrupt
SPI interrupt
8
12
16
19
20
23
24
2
USB
GPIO
EMIF
I2C
USB Interrupt
GPIO aggregated interrupt
EMIF error interrupt
I2C interrupt
BERR
DLOG
RTOS
-
Bus error interrupt
25
26
14
Data log interrupt
Real-time operating system interrupt
Software interrupt #27
(1)
(2)
Absolute addresses of the interrupt vector locations are determined by the contents of the IVPD and IVPH registers. Interrupt
vectors for interrupts 0-15 and 24-31 are relative to IVPD. Interrupt vectors for interrupts 16-23 are relative to IVPH.
The NMI signal is internally tied high (not asserted). However, NMI interrupt vector can be used for SINT1.
53
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Interrupts
Table 1-32. Interrupt Table (continued)
SOFTWARE
(TRAP)
EQUIVALENT
RELATIVE
LOCATION
(HEX BYTES)
NAME
PRIORITY
FUNCTION
(1)
-
-
-
-
SINT28
SINT29
SINT30
SINT31
0xE0
0xE8
0xF0
0xF8
15
16
17
18
Software interrupt #28
Software interrupt #29
Software interrupt #30
Software interrupt #31
1.6.1 IFR and IER Registers
The interrupt flag register 0 (IFR0) and interrupt enable register 0 (IER0) bit layouts are shown in
Figure 1-25. IFR0 and IER0 Bit Locations
15
14
13
12
11
10
9
8
RCV2
R/W-0
XMT2
R/W-0
SAR
LCD
PROG3
R/W-0
Reserved
R/W-0
PROG2
R/W-0
DMA
R/W-0
R/W-0
R/W-0
7
6
5
4
3
2
1
0
PROG1
R/W-0
UART
R/W-0
PROG0
R/W-0
TINT
R/W-0
INT1
R/W-0
INT0
R/W-0
Reserved
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-33. IFR0 and IER0 Bit Descriptions
Bit
15
14
13
12
11
Field
RCV2
XMT2
SAR
Value Description
1-0
1-0
1-0
1-0
1-0
I2S2 receive interrupt flag/mask bit.
I2S2 transmit interrupt flag/mask bit.
10-BIT SAR A/D conversion or pin interrupt flag/mask bit.
LCD interrupt bit.
LCD
PROG3
Programmable receive interrupt 3 flag/mask bit. This bit is used as either the I2S1 receive interrupt
flag/mask bit or the MMC/SD1 SDIO interrupt flag/mask bit. The function of this bit is selected
depending on the setting of the SP1MODE bit is in external bus selection register. If SP1MODE =
00b, this bit supports MMC/SD1 SDIO interrupts. If SP1MODE = 01, this bit supports I2S1
interrupts.
10
9
Reserved
PROG2
0
Reserved. This bit should always be written with 0.
1-0
Programmable transmit interrupt 2 flag/mask bit. This bit is used as either the I2S1 transmit
interrupt flag/mask bit or the MMC/SD1 interrupt flag/mask bit. The function of this bit is selected
depending on the setting of the SP1MODE bit in the external bus selection register. If SP1MODE =
00b, this bit supports MMC/SD1 interrupts. If SP1MODE = 01, this bit supports I2S1 interrupts.
8
7
DMA
1-0
1-0
DMA aggregated interrupt flag/mask bit
PROG1
Programmable receive interrupt 1 flag/mask bit. This bit is used as either the I2S0 receive interrupt
flag/mask bit or the MMC/SD0 SDIO interrupt flag/mask bit. The function of this bit is selected
depending on the setting of the SP0MODE bit in the external bus selection register. If SP0MODE =
00b, this bit supports MMC/SD0 SDIO interrupts. If SP0MODE = 01, this bit supports I2S0
interrupts.
6
5
UART
1-0
1-0
UART interrupt flag/mask bit
PROG0
Programmable transmit interrupt 0 flag/mask bit. This bit is used as either the I2S0 transmit
interrupt flag/mask bit or the MMC/SD0 interrupt flag/mask bit. The function of this bit is selected
depending on the setting of the SP0MODE bit in the external bus selection register. If SP0MODE =
00b, this bit supports MMC/SD0 interrupts. If SP0MODE = 01, this bit supports I2S0 interrupts.
4
3
TINT
1-0
1-0
1-0
0
Timer aggregated interrupt flag/mask bit.
External user interrupt #1 flag/mask bit.
External user interrupt #0 flag/mask bit.
Reserved. This bit should always be written with 0.
INT1
2
INT0
1-0
Reserved
54
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
Interrupts
The interrupt flag register (IFR1) and interrupt enable register 1 (IER1) bit layouts are shown in
Figure 1-26. IFR1 and IER1 Bit Locations
15
11
10
9
8
Reserved
R-0
RTOS
R/W-0
DLOG
R/W-0
BERR
R/W-0
7
6
5
4
3
2
1
0
I2C
EMIF
R/W-0
GPIO
R/W-0
USB
R/W-0
SPI
RTC
R/W-0
RCV3
R/W-0
XMT3
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-34. IFR1 and IER1 Bit Descriptions
Bit
Field
Value Description
15-11 Reserved
0
Reserved. This bit should always be written with 0.
Real-Time operating system interrupt flag/mask bit.
Data log interrupt flag/mask bit.
10
9
8
7
6
5
4
3
2
1
0
RTOS
DLOG
BERR
I2C
1-0
1-0
1-0
1-0
1-0
1-0
1-0
1-0
1-0
1-0
1-0
Bus error interrupt flag/mask bit.
I2C interrupt flag/mask bit.
EMIF
GPIO
USB
EMIF error interrupt flag/mask bit.
GPIO aggregated interrupt flag/mask bit.
USB interrupt flag/mask bit.
SPI
SPI interrupt flag/mask bit.
RTC
Wakeup or real-time clock interrupt flag/mask bit.
I2S3 receive interrupt flag/mask bit.
I2S3 transmit interrupt flag/mask bit.
RCV3
XMT3
1.6.2 Interrupt Timing
The interrupt signals on the external interrupts pins (INT0 and INT1) are detected with a synchronous
negative edge detector circuit. To reliably detect the external interrupts, the interrupt signal must have at
least 2 SYSCLK high followed by at least 2 SYSCLK low.
To define the minimum low pulse width in nanoseconds scale, you should take into account that the
on-chip PLL of the device is software programmable and that your application may be dynamically
changing the frequency of PLL. You should use the slowest frequency that will be used by your application
to calculate the minimum interrupt pulse duration in nanoseconds.
When the system master clock is disabled (SYSCLKDIS =1), the external interrupt pins (INT0 and INT1)
will be asynchronously latched and held low while the clocks are re-enabled. Once the clocks are
re-enabled, the DSP will latch the interrupt in the IFR.
55
SPRUFX5A–October 2010–Revised November 2010
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Copyright © 2010, Texas Instruments Incorporated
Interrupts
1.6.3 Timer Interrupt Aggregation Flag Register (TIAFR) [1C14h]
The CPU has only one interrupt flag that is shared among the three timers. The CPU's interrupt flag is bit
4 (TINT) of the IFR0 & IER0 registers (see Figure 1-25). Since the interrupt flag is shared, software must
have a means of determining which timer instance caused the interrupt. Therefore, the timer interrupt
aggregation flag register (TIAFR) is a secondary flag register that serves this purpose.
The timer interrupt aggregation flag register (TIAFR) latches each timer (Timer 0, Timer 1, and Timer 2)
interrupt signal when the timer counter expires. Using this register, the programmer can determine which
timer generated the timer aggregated CPU interrupt signal (TINT). Each Timer flag in TIAFR needs to be
cleared by the CPU with a write of 1. Note that the IFR0[TINT] bit is automatically cleared when entering
the interrupt service routine (ISR). Therefore there is no need to manually clear it in the ISR. If two (or
more) timers happen to interrupt simultaneously, the TIAFR register will indicate the two (or more)
interrupt flags. In this case, the ISR can choose to service both timer interrupts or only one-at-a-time. If the
ISR services only one of them, then it should clear only one of the TIAFR flags and upon exiting the ISR,
the CPU will immediately be interrupted again to service the second timer flag. If the ISR services all of
them, then it should clear all of them in the TIAFR flags and upon exiting the ISR, the CPU won't be
interrupted again until a new timer interrupt comes in. For more information, see the
1.6.4 GPIO Interrupt Enable and Aggregation Flag Registers
The CPU has only one interrupt flag that is shared among all GPIO pin interrupt signals. The CPU's
interrupt flag is bit 5 (GPIO) of the IFR1 & IER1 registers (see Figure 1-26). Since the interrupt flag is
shared, software must have a means of determining which GPIO pin caused the interrupt. Therefore, the
GPIO interrupt aggregation flag registers (IOINTFLG1 and IOINTFLG2) are secondary flag registers that
serve this purpose.
If any of the GPIO pins are configured as inputs, they can be enabled to accept external signals as
interrupts using the GPIO Interrupt Enable Registers (IOINTEN1 and IOINTEN2). The GPIO Interrupt Flag
Registers (IOINTFLG1 and IOINTFLG2) can be used to determine which of the 32 GPIO pins triggered
the interrupt. Note that the IFR0[GPIO] bit is automatically cleared when entering the interrupt service
routine (ISR). Therefore, there is no need to manually clear it in the ISR. If two (or more) GPIO pins
happen to interrupt simultaneously, the IOINTFLG1/IOINTFLG2 register indicates the two (or more)
interrupt flags. In this case, the ISR can choose to service both/all GPIO interrupts or only one-at-a-time. If
the ISR services only one of them, then it should clear only one of the IOINTFLG1/IOINTFLG2 flags and
upon exiting the ISR, the CPU is immediately interrupted again to service the others. For more
information, see the TMS320C5515/14/05/04/VC05/VC04 DSP General-Purpose Input/Output (GPIO)
1.6.5 DMA Interrupt Enable and Aggregation Flag Registers
The CPU has only one interrupt flag that is shared among the 16 DMA interrupt sources. The CPU's
interrupt flag is bit 8 (DMA) of the IFR0 & IER0 registers (see Figure 1-25). Since the interrupt flag is
shared, software must have a means of determining which DMA instance caused the interrupt. Therefore,
the DMA interrupt aggregation flag registers (DMAIFR) are secondary flag registers that serve this
purpose.
Each of the four channels of a DMA controller has its own interrupt, which you can enable or disable a
channel interrupt though the DMAnCHm bits of the DMA Interrupt Enable Register (DMAIER) (see
Section 1.7.4.2.1). The interrupts from the four DMA controllers are combined into a single CPU interrupt.
You can determine which DMA channel generated the interrupt by reading the bits of the DMA interrupt
flag register (DMAIFR). For more information, see the TMS320VC5505/VC5504 DSP Direct Memory
56
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
System Configuration and Control
1.7 System Configuration and Control
1.7.1 Overview
The DSP includes system-level registers for controlling, configuring, and reading status of the device.
These registers are accessible by the CPU and support the following features:
•
•
Device Identification
Device Configuration
–
–
–
–
Pin multiplexing control
Output drive strength configuration
Internal pull-up and pull-down enable/disable
On-chip LDO control
•
•
•
DMA Controller Configuration
Peripheral Reset
EMIF and USB Byte Access
1.7.2 Device Identification
The DSP includes a set of device ID registers that are intended for use in TI chip manufacturing, but can
be used by users as a 128-bit unique ID for each device. These registers are summarized in the following
table.
Table 1-35. Die ID Registers
CPU Word
Address
Acronym
Register Description
Section
1C40h
1C41h
1C42h
1C43h
1C44h
1C45h
1C46h
1C47h
DIEIDR0
DIEIDR1
DIEIDR2
DIEIDR3
DIEIDR4
DIEIDR5
DIEIDR6
DIEIDR7
Die ID Register 0
Die ID Register 1
Die ID Register 2
Die ID Register 3
Die ID Register 4
Die ID Register 5
Die ID Register 6
Die ID Register 7
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SPRUFX5A–October 2010–Revised November 2010
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Copyright © 2010, Texas Instruments Incorporated
System Configuration and Control
1.7.2.1 Die ID Register 0 (DIEIDR0) [1C40h]
Figure 1-27. Die ID Register 0 (DIEIDR0) [1C40h]
15
0
DIEID0
R
LEGEND: R = Read only; -n = value after reset
Table 1-36. Die ID Register 0 (DIEIDR0) Field Descriptions
Bit
Field
Value
Description
15-0
DIEID0
0-FFFFh
Die ID bits.
1.7.2.2 Die ID Register 1 (DIEIDR1) [1C41h]
Figure 1-28. Die ID Register 1 (DIEIDR1) [1C41h]
15
14
13
0
Reserved
DIEID1
R
R
LEGEND: R = Read only; -n = value after reset
Table 1-37. Die ID Register 1 (DIEIDR1) Field Descriptions
Bit
15-14 Reserved
13-0 DIEID1
Field
Value
0
Description
Reserved.
Die ID bits.
0-3FFFh
1.7.2.3 Die ID Register 2 (DIEIDR2) [1C42h]
Figure 1-29. Die ID Register 2 (DIEIDR2) [1C42h]
15
0
DIEID2
R
LEGEND: R = Read only; -n = value after reset
Table 1-38. Die ID Register 2 (DIEIDR2) Field Descriptions
Bit
Field
Value
Description
15-0
DIEID2
0-FFFFh
Die ID bits.
58
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
System Configuration and Control
1.7.2.4 Die ID Register 3 (DIEIDR3[15:0]) [1C43h]
Figure 1-30. Die ID Register 3 (DIEIDR3[15:0]) [1C43h]
15
12
11
0
DesignRev
R
DIEID3
R
LEGEND: R = Read only; -n = value after reset
Table 1-39. Die ID Register 3 (DIEIDR3[15:0]) Field Descriptions
Bit
Field
Value
0-Fh
Description
Silicon Revision
Silicon 2.0
15-12 DesignRev
0
11-0
DIEID3
0-FFFFh
Die ID bits.
1.7.2.5 Die ID Register 4 (DIEIDR4) [1C44h]
Figure 1-31. Die ID Register 4 (DIEIDR4) [1C44h]
15
6
5
0
Reserved
R
DIEID4
R
LEGEND: R = Read only; -n = value after reset
Table 1-40. Die ID Register 4 (DIEIDR4) Field Descriptions
Bit
15-6
5-0
Field
Value Description
Reserved
DIEID4
0
Reserved.
0-3Fh Die ID bits.
1.7.2.6 Die ID Register 5 (DIEIDR5) [1C45h]
Figure 1-32. Die ID Register 5 (DIEIDR5) [1C45h]
15
0
Reserved
R
LEGEND: R = Read only; -n = value after reset
Table 1-41. Die ID Register 5 (DIEIDR5) Field Descriptions
Bit
Field
Value Description
Reserved.
15-0
Reserved
0
59
SPRUFX5A–October 2010–Revised November 2010
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Copyright © 2010, Texas Instruments Incorporated
System Configuration and Control
1.7.2.7 Die ID Register 6 (DIEIDR6) [1C46h]
Figure 1-33. Die ID Register 6 (DIEIDR6) [1C46h]
15
0
Reserved
R
LEGEND: R = Read only; -n = value after reset
Table 1-42. Die ID Register 6 (DIEIDR6) Field Descriptions
Bit
Field
Value Description
Reserved.
15-0
Reserved
0
1.7.2.8 Die ID Register 7 (DIEIDR7) [1C47h]
Figure 1-34. Die ID Register 7 (DIEIDR7) [1C47h]
15
Reserved
R
14
1
0
Reserved
R
CHECKSUM
R
LEGEND: R = Read only; -n = value after reset
Table 1-43. Die ID Register 7 (DIEIDR7) Field Descriptions
Bit
15
Field
Value
Description
Reserved.
Reserved
CHECKSUM
Reserved
0
0-3FFFh
0
14-1
0
Checksum bits.
Reserved.
60
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
System Configuration and Control
1.7.3 Device Configuration
The DSP includes registers for configuring pin multiplexing, the pin output slew rate, the internal pull-ups
and pull-downs, DSP_LDO voltage selection and USB_LDO enable.
1.7.3.1 External Bus Selection Register (EBSR)
The external bus selection register (EBSR) determines the mapping of the LCD controller, I2S2, I2S3,
UART, SPI, and GPIO signals to 21 signals of the external parallel port pins. It also determines the
mapping of the I2S or MMC/SD ports to serial port 1 pins and serial port 2 pins. The EBSR register is
located at port address 0x1C00. Once the bit fields of this register are changed, the routing of the signals
takes place on the next CPU clock cycle.
Additionally, the EBSR controls the function of the upper bits of the EMIF address bus. Pins EM_A[20:15]
can be individually configured as GPIO pins through the Axx_MODE bits. When Axx_MODE = 1, the
EM_A[xx] pin functions as a GPIO pin. When Axx_MODE = 0, the EM_A[xx] pin retains its EMIF
functionality.
Before modifying the values of the external bus selection register, you must clock gate all affected
peripherals through the Peripheral Clock Gating Control Register (for more information on clock gating
peripherals, see Section 1.5.3.2). After the external bus selection register has been modified, you must
reset the peripherals before using them through the Peripheral Software Reset Counter Register.
After the boot process is complete, the external bus selection register must be modified only once, during
device configuration. Continuously switching the EBSR configuration is not supported.
Figure 1-35. External Bus Selection Register (EBSR) [1C00h]
15
Reserved
R-0
14
12
11
10
9
8
PPMODE
R/W-000
SP1MODE
R/W-00
SP0MODE
R/W-00
7
6
5
4
3
2
1
0
Reserved
R-0
Reserved
R-0
A20_MODE
R/W-0
A19_MODE
R/W-0
A18_MODE
R/W-0
A17_MODE
R/W-0
A16_MODE
R/W-0
A15_MODE
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
61
SPRUFX5A–October 2010–Revised November 2010
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Copyright © 2010, Texas Instruments Incorporated
System Configuration and Control
Table 1-44. EBSR Register Bit Descriptions Field Descriptions
Bit
Field
Value Description
15
Reserved
0
Reserved. Read-only, writes have no effect.
14-12 PPMODE
Parallel Port Mode Control Bits. These bits control the pin multiplexing of the LCD Controller, SPI,
UART, I2S2, I2S3, and GP[31:27, 20:18] pins on the parallel port.
000
001
Mode 0 (16-bit LCD Controller). All 21 signals of the LCD Bridge module are routed to the 21
external signals of the parallel port.
Mode 1 (SPI, GPIO, UART, and I2S2). 7 signals of the SPI module, 6 GPIO signals, 4 signals of
the UART module and 4 signals of the I2S2 module are routed to the 21 external signals of the
parallel port.
010
011
Mode 2 (8-bit LCD Controller and GPIO). 8-bits of pixel data of the LCD Controller module and 8
GPIO are routed to the 21 external signals of the parallel port.
Mode 3 (8-bit LCD Controller, SPI, and I2S3). 8-bits of pixel data of the LCD Controller module, 4
signals of the SPI module, and 4 signals of the I2S3 module are routed to the 21 external signals of
the parallel port.
100
101
Mode 4 (8-bit LCD Controller, I2S2, and UART). 8-bits of pixel data of the LCD Controller module, 4
signals of the I2S2 module, and 4 signals of the UART module are routed to the 21 external signals
of the parallel port.
Mode 5 (8-bit LCD Controller, SPI, and UART). 8-bits of pixel data of the LCD Controller module, 4
signals of the SPI module, and 4 signals of the UART module are routed to the 21 external signals
of the parallel port.
110
111
Mode 6 (SPI, I2S2, I2S3, and GPIO). 7 signals of the SPI module, 4 signals of the I2S2 module, 4
signals of the I2S3 module, and 6 GPIO are routed to the 21 external signals of the parallel port.
Reserved
11-10 SP1MODE
Serial Port 1 Mode Control Bits. The bits control the pin multiplexing of the MMC1, I2S1, and GPIO
pins on serial port 1.
00
01
10
11
Mode 0 (MMC/SD1). All 6 signals of the MMC/SD1 module are routed to the 6 external signals of
the serial port 1.
Mode 1 (I2S1 and GP[11:10]). 4 signals of the I2S1 module and 2 GP[11:10] signals are routed to
the 6 external signals of the serial port 1.
Mode 2 (GP[11:6]). 6 GPIO signals (GP[11:6]) are routed to the 6 external signals of the serial port
1.
Reserved
9-8
SP0MODE
Serial Port 0 Mode Control Bits. The bits control the pin multiplexing of the MMC0, I2S0, and GPIO
pins on serial port 0.
00
01
Mode 0 (MMC/SD0). All 6 signals of the MMC/SD0 module are routed to the 6 external signals of
the serial port 0.
Mode 1 (I2S0 and GP[5:0]). 4 signals of the I2S0 module and 2 GP[5:4] signals are routed to the 6
external signals of the serial port 0.
10
11
0
Mode 2 (GP[5:0]). 6 GPIO signals (GP[5:0]) are routed to the 6 external signals of the serial port 0.
Reserved
7-6
5
Reserved
Reserved. Read-only, writes have no effect.
A20_MODE
A20 Pin Mode Bit. This bit controls the pin multiplexing of the EMIF address 20 (EM_A[20]) and
general-purpose input/output pin 26 (GP[26]) pin functions.
0
1
Pin function is EMIF address pin 20 (EM_A[20]).
Pin function is general-purpose input/output pin 26 (GP[26]).
4
3
A19_MODE
A18_MODE
A19 Pin Mode Bit. This bit controls the pin multiplexing of the EMIF address 19 (EM_A[19]) and
general-purpose input/output pin 25 (GP[25]) pin functions.
0
1
Pin function is EMIF address pin 19 (EM_A[19]).
Pin function is general-purpose input/output pin 25 (GP[25]).
A18 Pin Mode Bit. This bit controls the pin multiplexing of the EMIF address 18 (EM_A[18]) and
general-purpose input/output pin 24 (GP[24]) pin functions.
0
1
Pin function is EMIF address pin 18 (EM_A[18]).
Pin function is general-purpose input/output pin 24 (GP[24]).
62
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
System Configuration and Control
Table 1-44. EBSR Register Bit Descriptions Field Descriptions (continued)
Bit
Field
Value Description
2
A17_MODE
A16_MODE
A15_MODE
A17 Pin Mode Bit. This bit controls the pin multiplexing of the EMIF address 17 (EM_A[17]) and
general-purpose input/output pin 23 (GP[23]) pin functions.
Pin function is EMIF address pin 17 (EM_A[17]).
0
1
Pin function is general-purpose input/output pin 23 (GP[23]).
1
0
A16 Pin Mode Bit. This bit controls the pin multiplexing of the EMIF address 16 (EM_A[16]) and
general-purpose input/output pin 22 (GP[22]) pin functions.
0
1
Pin function is EMIF address pin 16 (EM_A[16]).
Pin function is general-purpose input/output pin 22 (GP[22]).
A15 Pin Mode Bit. This bit controls the pin multiplexing of the EMIF address 15 (EM_A[15]) and
general-purpose input/output pin 21 (GP[21]) pin functions.
0
1
Pin function is EMIF address pin 15 (EM_A[15]).
Pin function is general-purpose input/output pin 21 (GP[21]).
1.7.3.2 LDO Control Register [7004h]
When the DSP_LDO is enabled by the DSP_LDO_EN pin [D12], by default, the DSP_LDOO voltage is set
to 1.3 V. The DSP_LDOO voltage can be programmed to be either 1.05 V or 1.3 V via the DSP_LDO_V
bit (bit 1) in the LDO Control Register (LDOCNTL).
At reset, the USB_LDO is turned off. The USB_LDO can be enabled via the USBLDOEN bit (bit 0) in the
LDOCNTL register.
1.7.3.3 LDO Control
All three LDOs can be simultaneously disabled via software by writing to either the BG_PD bit or the
mechanism, the only way to re-enable them is by asserting the WAKEUP signal pin (which must also have
been previously enabled to allow wakeup), or by a previously enabled and configured RTC alarm, or by
cycling power to the CVDDRTC pin.
ANA_LDO: The ANA_LDO is only disabled by the BG_PD and the LDO_PD mechanism described above.
Otherwise, it is always enabled.
DSP_LDO: The DSP_LDO can be statically disabled by the DSP_LDO_EN pin. It can be also dynamically
disabled via the BG_PD and the LDO_PD mechanism described above. The DSP_LDO can change its
output voltage dynamically by software via the DSP_LDO_V bit in the LDOCNTL register (see
Figure 1-37). The DSP_LDO output voltage is set to 1.3 V at reset.
USB_LDO: The USB_LDO can be independently and dynamically enabled or disabled by software via the
Table 1-47 shows the ON/OFF control of each LDO and its register control bit configurations.
Figure 1-36. RTC Power Management Register (RTCPMGT) [1930h]
15
7
8
Reserved
R-0
5
4
3
2
1
0
Reserved
R-0
WU_DOUT
R/W-0
WU_DIR
R/W-0
BG_PD
R/W-0
LDO_PD
R/W-0
RTCCLKOUTEN
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
63
SPRUFX5A–October 2010–Revised November 2010
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System Configuration and Control
Table 1-45. RTCPMGT Register Bit Descriptions Field Descriptions
Bit
15-5
4
Field
Value Description
Reserved
WU_DOUT
0
Reserved. Read-only, writes have no effect.
Wakeup output, active low/open-drain.
WAKEUP pin driven low.
0
1
WAKEUP pin is in high-impedance (Hi-Z).
Wakeup pin direction control.
3
WU_DIR
0
1
WAKEUP pin configured as a input.
WAKEUP pin configured as a output.
Note: When the WAKEUP pin is configured as an input, it is active high. When the WAKEUP pin is
configured as an output, is an open-drain that is active low and should be externally pulled-up via a
10-kΩ resistor to DVDDRTC. WU_DIR must be configured as an input to allow the WAKEUP pin to
wake the device up from idle modes.
2
BG_PD
Bandgap, on-chip LDOs, and the analog POR power down bit.
This bit shuts down the on-chip LDOs (ANA_LDO, DSP_LDO, and USB_LDO), the Analog POR,
and Bandgap reference. BG_PD and LDO_PD are only intended to be used when the internal
LDOs supply power to the chip. If the internal LDOs are bypassed and not used then the BG_PD
and LDO_PD power down mechanisms should not be used since POR gets powered down and the
POWERGOOD signal is not generated properly.
After this bit is asserted, the on-chip LDOs, Analog POR, and the Bandgap reference can be
re-enabled by the WAKEUP pin (high) or the RTC alarm interrupt. The Bandgap circuit will take
about 100 msec to charge the external 0.1 uF capacitor via the internal 326-kΩ resistor.
0
1
On-chip LDOs, Analog POR, and Bandgap reference are enabled.
On-chip LDOs, Analog POR, and Bandgap reference are disabled (shutdown).
On-chip LDOs and Analog POR power down bit.
1
LDO_PD
This bit shuts down the on-chip LDOs (ANA_LDO, DSP_LDO, and USB_LDO) and the Analog
POR. BG_PD and LDO_PD are only intended to be used when the internal LDOs supply power to
the chip. If the internal LDOs are bypassed and not used then the BG_PD and LDO_PD power
down mechanisms should not be used since POR gets powered down and the POWERGOOD
signal is not generated properly.
After this bit is asserted, the on-chip LDOs and Analog POR can be re-enabled by the WAKEUP
pin (high) or the RTC alarm interrupt. This bit keeps the Bandgap reference turned on to allow a
faster wake-up time with the expense power consumption of the Bandgap reference.
0
1
On-chip LDOs and Analog POR are enabled.
On-chip LDOs and Analog POR are disabled (shutdown).
Clockout output enable bit
0
RTCCLKOUTEN
0
1
Clock output disabled
Clock output enabled
64
System Control
SPRUFX5A–October 2010–Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
15
System Configuration and Control
Figure 1-37. LDO Control Register (LDOCNTL) [7004h]
8
Reserved
R-0
7
2
1
0
Reserved
R-0
DSP_LDO_V
R/W-0
USB_LDO_EN
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-46. LDOCNTL Register Bit Descriptions Field Descriptions
Bit
15-2
1
Field
Value Description
Reserved
DSP_LDO_V
0
Reserved. Read-only, writes have no effect.
DSP_LDO voltage select bit.
0
1
DSP_LDOO is regulated to 1.3 V.
DSP_LDOO is regulated to 1.05 V.
USB_LDO enable bit.
0
USB_LDO_EN
0
1
USB_LDO output is disabled. USB_LDOO pin is placed in high-impedance (Hi-Z) state.
USB_LDO output is enabled. USB_LDOO is regulated to 1.3 V.
Table 1-47. LDO Controls Matrix
RTCPMGT Register
(0x1930)
LDOCNTL Register
(0x7004)
DSP_LDO_EN
BG_PD Bit
LDO_PD Bit
USB_LDO_EN Bit
(Pin D12)
Don't Care
Don't Care
Low
ANA_LDO
OFF
DSP_LDO
OFF
USB_LDO
OFF
1
Don't Care
Don't Care
Don't Care
1
0
0
0
Don't Care
OFF
OFF
OFF
0
0
0
0
0
1
ON
ON
OFF
High
ON
OFF
OFF
Low
ON
ON
ON
65
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System Configuration and Control
1.7.3.4 Output Slew Rate Control Register (OSRCR) [1C16h]
To provide the lowest power consumption setting, the DSP has configurable slew rate control on the EMIF
and CLKOUT output pins. The output slew rate control register (OSRCR) is used to set a subset of the
device I/O pins, namely CLKOUT and EMIF pins, to either fast or slow slew rate. The slew rate feature is
implemented by staging/delaying turn-on times of the parallel p-channel drive transistors and parallel
n-channel drive transistors of the output buffer. In the slow slew rate configuration, the delay is longer, but
ultimately the same number of parallel transistors are used to drive the output high or low; therefore, the
drive strength is ultimately the same. The slower slew rate control can be used for power savings and has
the greatest effect at lower DVDDIO and DVDDEMIF voltages.
Figure 1-38. Output Slew Rate Control Register (OSRCR) [1C16h]
15
3
2
1
0
Reserved
R-0
CLKOUTSR
RW-1
Reserved
R-0
EMIFSR
RW-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-48. Output Slew Rate Control Register (OSRCR) Field Descriptions
Bit
15-3
2
Field
Value Description
Reserved
CLKOUTSR
0
Reserved.
CLKOUT pin output slew rate bits. These bits set the slew rate for the CLKOUT pin.
0
1
0
Slow slew rate
Fast slew rate
1
0
Reserved
EMIFSR
Reserved.
EMIF pin output slew rate bits. These bits set the slew rate for the EMIF pins.
0
1
Slow slew rate
Fast slew rate
66
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System Configuration and Control
1.7.3.5 Pull-Up/Pull-Down Inhibit Register (PDINHIBR1, PDINHIBR2, and PDINHIBR3 [1C17h, 1C18h, and
1C19h]
The device allows you to individually enable or disable the internal pull-up and pull-down resistors. You
can individually inhibit the pull-up and pull-down resistors of the I/O pins through the pull-down/up inhibit
registers (PDINHIBRn). There is one pin, TRSTN, that has a pulldown that is permanently enabled and
cannot be disabled.
Figure 1-39. Pull-Down Inhibit Register 1 (PDINHIBR1) [1C17h]
15
7
14
6
13
12
11
10
9
8
Reserved
R-0
S15PD
R/W-1
S14PD
R/W-1
S13PD
R/W-1
S12PD
R/W-1
S11PD
R/W-1
S10PD
R/W-1
5
4
3
2
1
0
Reserved
R-0
S05PD
R/W-1
S04PD
R/W-1
S03PD
R/W-1
S02PD
R/W-1
S01PD
R/W-1
S00PD
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-49. Pull-Down Inhibit Register 1 (PDINHIBR1) Field Descriptions
Bit
Field
Value Description
15-14 Reserved
0
Reserved.
13
12
11
10
9
S15PD
S14PD
S13PD
S12PD
S11PD
S10PD
Serial port 1 pin 5 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Serial port 1 pin 4 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Serial port 1 pin 3 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Serial port 1 pin 2 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Serial port 1 pin 1 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
8
Serial port 1 pin 0 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
0
Pin pull-down is enabled.
Pin pull-down is disabled.
7-6
5
Reserved
S05PD
Reserved.
Serial port 0 pin 5 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
4
3
S04PD
S03PD
Serial port 0 pin 4 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Serial port 0 pin 3 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
67
SPRUFX5A–October 2010–Revised November 2010
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System Configuration and Control
Table 1-49. Pull-Down Inhibit Register 1 (PDINHIBR1) Field Descriptions (continued)
Bit
Field
Value Description
Serial port 0 pin 2 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
2
S02PD
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
1
0
S01PD
S00PD
Serial port 0 pin 1 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Serial port 0 pin 0 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Figure 1-40. Pull-Down Inhibit Register 2 (PDINHIBR2) [1C18h]
15
14
13
12
11
10
9
8
Reserved
R-0
INT1PU
R/W-1
INT0PU
R/W-1
RESETPU
R/W-0
EMU01PU
R/W-0
TDIPU
R/W-0
TMSPU
R/W-0
TCKPU
R/W-0
7
6
5
4
3
2
1
0
Reserved
R-0
A20PD
R/W-1
A19PD
R/W-1
A18PD
R/W-1
A17PD
R/W-1
A16PD
R/W-1
A15PD
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-50. Pull-Down Inhibit Register 2 (PDINHIBR2) Field Descriptions
Bit
15
14
Field
Value Description
Reserved
INT1PU
0
Reserved.
Interrupt 1 pin pull-up inhibit bit. Setting this bit to 1 disables the pin's internal pull-up.
0
1
Pin pull-up is enabled.
Pin pull-up is disabled.
13
12
11
10
9
INT0PU
RESETPU
EMU01PU
TDIPU
Interrupt 0 pin pull-up inhibit bit. Setting this bit to 1 disables the pin's internal pull-up.
0
1
Pin pull-up is enabled.
Pin pull-up is disabled.
Reset pin pull-up inhibit bit. Setting this bit to 1 disables the pin's internal pull-up.
0
1
Pin pull-up is enabled.
Pin pull-up is disabled.
EMU1 and EMU0 pin pull-up inhibit bit. Setting this bit to 1 disables the pin's internal pull-up.
0
1
Pin pull-up is enabled.
Pin pull-up is disabled.
TDI pin pull-up inhibit bit. Setting this bit to 1 disables the pin's internal pull-up.
0
1
Pin pull-up is enabled.
Pin pull-up is disabled.
TMSPU
TMS pin pull-up inhibit bit. Setting this bit to 1 disables the pin's internal pull-up.
0
1
Pin pull-up is enabled.
Pin pull-up is disabled.
8
TCKPU
TCK pin pull-up inhibit bit. Setting this bit to 1 disables the pin's internal pull-up.
0
1
0
Pin pull-up is enabled.
Pin pull-up is disabled.
Reserved.
7-6
Reserved
68
System Control
SPRUFX5A–October 2010–Revised November 2010
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System Configuration and Control
Table 1-50. Pull-Down Inhibit Register 2 (PDINHIBR2) Field Descriptions (continued)
Bit
Field
Value Description
EMIF A[20] pin pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
5
A20PD
A19PD
A18PD
A17PD
A16PD
A15PD
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
4
3
2
1
0
EMIF A[19] pin pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
EMIF A[18] pin pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
EMIF A[17] pin pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
EMIF A[16] pin pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
EMIF A[15] pin pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Figure 1-41. Pull-Down Inhibit Register 3 (PDINHIBR3) [1C19h]
15
14
13
12
11
10
9
8
PD15PD
R/W-1
PD14PD
R/W-1
PD13PD
R/W-1
PD12PD
R/W-1
PD11PD
R/W-1
PD10PD
R/W-1
PD9PD
R/W-1
PD8PD
R/W-1
7
6
5
4
3
2
1
0
PD7PD
R/W-1
PD6PD
R/W-1
PD5PD
R/W-1
PD4PD
R/W-1
PD3PD
R/W-1
PD2PD
R/W-1
Reserved
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-51. Pull-Down Inhibit Register 3 (PDINHIBR3) Field Descriptions
Bit
Field
Value Description
15
PD15PD
Parallel port pin 15 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
14
13
12
11
PD14PD
PD13PD
PD12PD
PD11PD
Parallel port pin 14 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Parallel port pin 13 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Parallel port pin 12 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Parallel port pin 11 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
69
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System Configuration and Control
Table 1-51. Pull-Down Inhibit Register 3 (PDINHIBR3) Field Descriptions (continued)
Bit
Field
Value Description
Parallel port pin 10 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
10
PD10PD
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
9
8
PD9PD
PD8PD
PD7PD
PD6PD
PD5PD
PD4PD
PD3PD
PD2PD
Reserved
Parallel port pin 9 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
Parallel port pin 8 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
7
Parallel port pin 7 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
6
Parallel port pin 6 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
5
Parallel port pin 5 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
4
Parallel port pin 4 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
3
Parallel port pin 3 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
Pin pull-down is enabled.
Pin pull-down is disabled.
2
Parallel port pin 2 pull-down inhibit bit. Setting this bit to 1 disables the pin's internal pull-down.
0
1
0
Pin pull-down is enabled.
Pin pull-down is disabled.
Reserved.
1-0
1.7.4 DMA Controller Configuration
The DSP includes four DMA controllers that allow movement of blocks of data among internal memory,
external memory, and peripherals to occur without intervention from the CPU and in the background of
CPU operation. Each DMA has an EVENT input signal (per channel) that can be used to tell it when to
start the block transfer. And each DMA has an interrupt output (per channel) that can signal the CPU
when the block transfer is completed. While most DMA configuration registers described in the
EVENT source and interrupt aggregation is more of a system-level concern and, therefore, they are best
described in this guide.
The following sections provide more details on these features. In this section and subsections, the
following notations will be used:
•
•
Lowercase, italicized, n is an integer, 0-3, representing each of the 4 DMAs.
Lowercase, italicized, m is an integer, 0-3, representing each of the 4 channels within each DMA.
70
System Control
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System Configuration and Control
1.7.4.1 DMA Synchronization Events
The DMA controllers allow activity in their channels to be synchronized to selected events. The DSP
supports 20 separate synchronization events and each channel can be tied to separate sync events
independent of the other channels. Synchronization events are selected by programming the CHnEVT
field in the DMAn channel event source registers (DMAnCESR1 and DMAnCESR2) (where n is an
integer, 0-3, representing each of the 4 DMAs). The synchronization events available to each DMA
Table 1-52. Channel Synchronization Events for DMA Controllers
DMA0
Synchronization
Event
DMA1
Synchronization
Event
DMA2
Synchronization
Event
DMA3 Synchronization
Event
CHmEVT Options
0000b
Reserved
I2S0 transmit event
I2S0 receive event
Reserved
Reserved
I2S2 transmit event
I2S2 receive event
Reserved
Reserved
Reserved
I2S1 transit event
I2S1 receive event
Reserved
0001b
I2C transmit event
I2C receive event
SAR A/D event
0010b
0011b
0100b
Reserved
Reserved
I2S3 transmit event
Reserved
MMC/SD0 transmit
event
0101b
0110b
UART transmit event
UART receive event
Reserved
I2S3 receive event
Reserved
Reserved
Reserved
Reserved
MMC/SD0 receive
event
0111b
1000b
MMC/SD1 transmit
event
Reserved
MMC/SD1 receive
event
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1001b
1010v
1011b
1100b
1101b
1110b
1111b
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Timer 0 event
Timer 1 event
Timer 2 event
Reserved
Timer 0 event
Timer 1 event
Timer 2 event
Reserved
Timer 0 event
Timer 1 event
Timer 2 event
Reserved
Timer 0 event
Timer 1 event
Timer 2 event
Reserved
1.7.4.2 DMA Configuration Registers
The system-level DMA registers are listed in Table 1-53. The DMA interrupt flag and enable registers
(DMAIFR and DMAIER) are used to control the aggregation and CPU interrupt generation for the four
DMA controllers and their associated channels. In addition, there are two registers per DMA controller
which control event synchronization in each channel; the DMAn channel event source registers
(DMAnCESR1 and DMAnCESR2).
Table 1-53. System Registers Related to the DMA Controllers
CPU Word
Acronym
Register Description
Address
1C30h
1C31h
1C1Ah
1C1Bh
1C1Ch
1C1Dh
1C36h
1C37h
1C38h
1C39h
DMAIFR
DMA Interrupt Flag Register
DMAIER
DMA Interrupt Enable Register
DMA0CESR1
DMA0CESR2
DMA1CESR1
DMA1CESR2
DMA2CESR1
DMA2CESR2
DMA3CESR1
DMA3CESR2
DMA0 Channel Event Source Register 1
DMA0 Channel Event Source Register 2
DMA1 Channel Event Source Register 1
DMA1 Channel Event Source Register 2
DMA2 Channel Event Source Register 1
DMA2 Channel Event Source Register 2
DMA3 Channel Event Source Register 1
DMA3 Channel Event Source Register 2
71
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System Configuration and Control
1.7.4.2.1 DMA Interrupt Flag Register (DMAIFR) [1C30h] and DMA Interrupt Enable Register (DMAIER)
[1C31h]
The DSP includes two registers for aggregating the four channel interrupts of the four DMA controllers.
Use the DMA interrupt enable register (DMAIER) to enable channel interrupts. At the end of a block
transfer, if the DMA controller channel interrupt enable (DMAnCHmIE) bit is 1, an interrupt request is sent
to the DSP CPU, where it can be serviced or ignored. Each channel can generate an interrupt, although
all channel interrupts are aggregated into a single DMA interrupt signal to the CPU.
To see which channel generated an interrupt, your program can read the DMA interrupt flag register
(DMAIFR). The DMA controller channel interrupt flag (DMAnCHmIF) bits are set to 1 when a DMA
channel generates an interrupt. Your program must manually clear the bits of DMAIFR by writing a 1 to
the bit positions to be cleared.
Figure 1-42. DMA Interrupt Flag Register (DMAIFR) [1C30h]
15
14
13
12
11
10
9
8
DMA3CH3IF
RW-0
DMA3CH2IF
RW-0
DMA3CH1IF
RW-0
DMA3CH0IF
RW-0
DMA2CH3IF
RW-0
DMA2CH2IF
RW-0
DMA2CH1IF
RW-0
DMA2CH0IF
RW-0
7
6
5
4
3
2
1
0
DMA1CH3IF
RW-0
DMA1CH2IF
RW-0
DMA1CH1IF
RW-0
DMA1CH0IF
RW-0
DMA0CH3IF
RW-0
DMA0CH2IF
RW-0
DMA0CH1IF
RW-0
DMA0CH0IF
RW-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 1-43. DMA Interrupt Enable Register (DMAIER) [1C31h]
15
14
13
12
11
10
9
8
DMA3CH3IE
RW-0
DMA3CH2IE
RW-0
DMA3CH1IE
RW-0
DMA3CH0IE
RW-0
DMA2CH3IE
RW-0
DMA2CH2IE
RW-0
DMA2CH1IE
RW-0
DMA2CH0IE
RW-0
7
6
5
4
3
2
1
0
DMA1CH3IE
RW-0
DMA1CH2IE
RW-0
DMA1CH1IE
RW-0
DMA1CH0IE
RW-0
DMA0CH3IE
RW-0
DMA0CH2IE
RW-0
DMA0CH1IE
RW-0
DMA0CH0IE
RW-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-54. DMA Interrupt Flag Register (DMAIFR) Field Descriptions
Bit
Field
Value Description
15-0
DMAnCHmIF
Channel interrupt status bits.
0
1
DMA controller n, channel m has not completed its block transfer.
DMA controller n, channel m block transfer complete.
Table 1-55. DMA Interrupt Enable Register (DMAIER) Field Descriptions
Bit
Field
Value Description
15-0
DMAnCHmIE
Channel interrupt enable bits.
0
1
DMA controller n, channel m interrupt is disabled.
DMA controller n, channel m interrupt is enabled.
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1.7.4.2.2 DMAn Channel Event Source Registers (DMAnCESR1 and DMAnCESR2) [1C1Ah, 1C1Bh,
1C1Ch, 1C1Dh, 1C36h, 1C37h, 1C38h, and 1C39h]
When SYNCMODE = 1 in a channel's DMACHmTCR2 (see the TMS320C5515/14/05/04 DSP Direct
synchronized to a DSP event. You can specify the synchronization event used by the DMA channels by
programming the CHmEVT bits of the DMAnCESR registers.
Each DMA controller contains two channel event source registers (DMAnCESR1 and DMAnCESR2).
DMAnCESR1 controls the synchronization event for DMAn channel 0 and 1 while DMAnCESR2 controls
the synchronization event for DMAn channel 2 and 3.
The synchronization events available to each DMA controller are shown in Table 1-52. Multiple DMAs and
multiple channels within a DMA are allowed to have the same synchronization event.
Figure 1-44. DMAn Channel Event Source Register 1 (DMAnCESR1) [1C1Ah, 1C1Ch, 1C36h, and
1C38h]
15
12
11
8
7
4
3
0
Reserved
R-0
CH1EVT
RW-0
Reserved
R-0
CH0EVT
RW-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 1-45. DMAn Channel Event Source Register 2 (DMAnCESR2) [1C1Bh, 1C1Dh, 1C37h, and
1C39h]
15
12
11
8
7
4
3
0
Reserved
R-0
CH3EVT
RW-0
Reserved
R-0
CH2EVT
RW-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-56. DMAn Channel Event Source Register 1 (DMAnCESR1) Field Descriptions
Bit
Field
Value Description
15-12 Reserved
0
Reserved.
11-8
CH1EVT
0-Fh
Channel 1 synchronization events. When SYNCMODE = 1 in a channel's DMACHmTCR2, the
CH1EVT bits in the DMAnCESR registers specify the synchronization event for activity in the DMA
7-4
3-0
Reserved
CH0EVT
0
Reserved.
0-Fh
Channel 0 synchronization events. when SYNCMODE = 1 in a channel's DMACHmTCR2, the
CH0EVT bits in the DMAnCESR registers specify the synchronization event for activity in the DMA
Table 1-57. DMAn Channel Event Source Register 2 (DMAnCESR2) Field Descriptions
Bit
Field
Value Description
15-12 Reserved
0
Reserved.
11-8
CH3EVT
0-Fh
Channel 3 synchronization events. When SYNCMODE = 1 in a channel's DMACHmTCR2, the
CH3EVT bits in the DMAnCESR registers specify the synchronization event for activity in the DMA
7-4
3-0
Reserved
CH2EVT
0
Reserved.
0-Fh
Channel 2 synchronization events. When SYNCMODE = 1 in a channel's DMACHmTCR2, the
CH2EVT bits in the DMAnCESR registers specify the synchronization event for activity in the DMA
1.7.5 Peripheral Reset
All peripherals can be reset through software using the peripheral reset control register (PRCR). The
peripheral software reset counter register (PSRCR) controls the duration, in SYSCLK cycles, that the reset
signal is asserted low once activated by the bits in PRCR.
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To reset a peripheral or group of peripherals, follow these steps:
1. Set COUNT = 08h in PSRCR.
2. Initiate the desired peripheral reset by setting to 1 the bits of PRCR.
3. Do not attempt to access the peripheral for at least the number of clock cycles set in the PSRCR
register. A repeated NOP may be necessary.
In some cases, a single reset is used for multiple peripherals. For example, PG4_RST controls the reset
to the LCD controller, I2S2, I2S3, UART, and SPI.
1.7.5.1 Peripheral Software Reset Counter Register (PSRCR) [1C04h]
Figure 1-46. Peripheral Software Reset Counter Register (PSRCR) [1C04h]
15
0
COUNT
R/W-0
LEGEND: R/W = Read/Write; -n = value after reset
Table 1-58. Peripheral Software Reset Counter Register (PSRCR) Field Descriptions
Bit
Field
Value
Description
15-0
COUNT
0-FFFFh
Count bits. These bits specify the number of system clock (SYSCLK) cycles the software
reset signals are asserted. When the software counter reaches 0, the software reset bits
will be cleared to 0. Always initialize this field with a value of at least 08h.
1.7.5.2 Peripheral Reset Control Register (PRCR) [1C05h]
Writing a 1 to any bits in this register initiates the reset sequence for the associated peripherals. The
associated peripherals will be held in reset for the duration of clock cycles set in the PSRCR register and
they should not be accessed during that time. Reads of this register return the state of the reset signal for
the associated peripherals. In other words, polling may be used to wait for the reset to become
de-asserted.
Figure 1-47. Peripheral Reset Control Register (PRCR) [1C05h]
15
14
13
12
11
10
9
8
Reserved
R-0
7
6
5
4
3
2
1
0
PG4_RST
R/W-0
Reserved
R-0
PG3_RST
R/W-0
DMA_RST
R/W-0
USB_RST
R/W-0
SAR_RST
R/W-0
PG1_RST
R/W-0
I2C_RST
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-59. Peripheral Reset Control Register (PRCR) Field Descriptions
Bit
15-8
7
Field
Value Description
Reserved
PG4_RST
0
Reserved. Always write 0 to these bits.
Peripheral group 4 software reset bit. Drives the LCD, I2S2, I2S3, UART, and SPI reset signal.
Write 0 Writing zero has no effect
Write 1 Writing one starts resetting the peripheral group
Read 0 Reading zero means that peripheral group is out of reset
Read 1 Reading one means the peripheral group is being held in reset and should not be accessed
6
Reserved
0
Reserved, always write 0 to this bit.
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Table 1-59. Peripheral Reset Control Register (PRCR) Field Descriptions (continued)
Bit
Field
Value Description
Peripheral group 3 software reset bit. Drives the MMC/SD0, MMC/SD1, I2S0, and I2S1 reset signal.
5
PG3_RST
DMA_RST
USB_RST
SAR_RST
Write 0 Writing zero has no effect
Write 1 Writing one starts resetting the peripheral group
Read 0 Reading zero means that peripheral group is out of reset
Read 1 Reading one means the peripheral group is being held in reset and should not be accessed
DMA software reset bit. Drives the reset signal to all four controllers.
Write 0 Writing zero has no effect
4
3
2
Write 1 Writing one starts resetting the peripheral group
Read 0 Reading zero means that peripheral group is out of reset
Read 1 Reading one means the peripheral group is being held in reset and should not be accessed
USB software reset bit. Drives the USB reset signal.
Write 0 Writing zero has no effect
Write 1 Writing one starts resetting the peripheral group
Read 0 Reading zero means that peripheral group is out of reset
Read 1 Reading one means the peripheral group is being held in reset and should not be accessed
SAR software reset bit and reset for most analog-related register in the IO-space address range of
0x7000-0x70FF
Write 0 Writing zero has no effect
Write 1 Writing one starts resetting the peripheral group
Read 0 Reading zero means that peripheral group is out of reset
Read 1 Reading one means the peripheral group is being held in reset and should not be accessed
Peripheral group 1 software reset bit. Drives the EMIF and all three timer reset signal.
Write 0 Writing zero has no effect
1
0
PG1_RST
I2C_RST
Write 1 Writing one starts resetting the peripheral group
Read 0 Reading zero means that peripheral group is out of reset
Read 1 Reading one means the peripheral group is being held in reset and should not be accessed
I2C software reset bit. Drives the I2C reset signal.
Write 0 Writing zero has no effect
Write 1 Writing one starts resetting the peripheral group
Read 0 Reading zero means that peripheral group is out of reset
Read 1 Reading one means the peripheral group is being held in reset and should not be accessed
1.7.6 EMIF and USB Byte Access
The C55x CPU architecture cannot generate 8-bit accesses to its data or I/O space. But in some cases
specific to the USB and EMIF peripherals, it is necessary to access a single byte of data. For example,
when writing byte commands to NAND Flash devices.
For these situations, the upper or lower byte of a CPU word access can be masked using the BYTEMODE
bits of the EMIF system control register (ESCR) and the USB system control register (USBSCR). The
BYTEMODE bits of ESCR only affect accesses to the external memory and the EMIF registers. The
summarize the effect of the BYTEMODE bits for different CPU operations.
NOTE: The BYTEMODE bits of the EMIF system control register should only be used for controlling
CPU accesses to NAND Flash devices and EMIF registers.
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Table 1-60. Effect of BYTEMODE Bits on EMIF Accesses
BYTEMODE Setting
CPU Access to EMIF Register
CPU Access To External Memory
ASIZE = 01b (16-bit data bus): EMIF generates a
single 16-bit access to external memory for every
CPU word access.
BYTEMODE = 00b (16-bit
word access)
Entire register contents are accessed
ASIZE = 00b (8-bit data bus): EMIF generates two
8-bit accesses to external memory for every CPU
word access.
BYTEMODE = 01b (8-bit
access with high byte selected) accessed.
Only the upper byte of the register is
ASIZE = 01b (16-bit data bus): EMIF generates a
16-bit access to external memory for every CPU word
access; only the high byte of the EMIF data bus is
used.
ASIZE = 00b (8-bit data bus): EMIF generates a
single 8-bit access to external memory for every CPU
word access.
BYTEMODE = 10b (8-bit
access with low byte selected) accessed.
Only the lower byte of the register is
ASIZE = 01b (16-bit data bus): EMIF generates a
16-bit access to external memory for every CPU word
access; only the low byte of the EMIF data bus is
used.
ASIZE = 00b (8-bit data bus): EMIF generates a
single 8-bit access to external memory for every CPU
word access.
Table 1-61. Effect of USBSCR BYTEMODE Bits on USB Access
BYTEMODE Setting
CPU Access to USB Register
BYTEMODE = 00b (16-bit word access)
BYTEMODE = 01b (8-bit access with high byte selected)
BYTEMODE = 10b (8-bit access with low byte selected)
Entire register contents are accessed
Only the upper byte of the register is accessed
Only the lower byte of the register is accessed
1.7.6.1 EMIF System Control Register (ESCR) [1C33h]
Figure 1-48. EMIF System Control Register (ESCR) [1C33h]
15
2
1
0
Reserved
R-0
BYTEMODE
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-62. EMIF System Control Register (ESCR) Field Descriptions
Bit
15-2
1-0
Field
Value Description
Reserved
BYTEMODE
0
Reserved.
EMIF byte mode select bits. These bits control CPU data and program accesses to external
memory as well as CPU accesses the EMIF registers.
0
Word accesses by the CPU are allowed.
Byte accesses by the CPU are allowed (high byte is selected).
Byte accesses by the CPU are allowed (low byte is selected).
Reserved.
1h
2h
3h
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1.7.7 EMIF Clock Divider Register (ECDR) [1C26h]
The EMIF clock divider register (ECDR) controls the input clock frequency to the EMIF module. When
EDIV = 1 (default), the EMIF operates at the same clock rate as the system clock (SYSCLK). When EDIV
= 0, the EMIF operates at half the clock rate of the system clock.
This register affects both asynchronous memory mode timing as well as synchronous (mobile SDRAM,
SDRAM) mode. But half-rate mode is normally only needed to meet synchronous memory timing. For
more information regarding when half-rate mode is required, see the mSDRAM timing sections of the
device-specific data sheet.
Figure 1-49. EMIF Clock Divider Register (ECDR) [1C26h]
15
1
0
Reserved
R-0
EDIV
R/W-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 1-63. EMIF Clock Divider Register (ECDR) Field Descriptions
Bit
15-1
0
Field
Value Description
Reserved
EDIV
0
Reserved.
EMIF clock divider select bits. The EMIF module can internally divide its input peripheral clock.
When this bit is set to 0, the EMIF operates at half the clock rate of its peripheral clock. When this
bit is set to 1 the EMIF operates at the full rate of its peripheral clock.
0
1
EMIF operates at half the peripheral clock rate.
EMIF operates at the same rate as the peripheral clock.
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