Texas Instruments TMS320C6000 DSP User manual

TMS320C6000 DSP

Software-Programmable

Phase-Locked Loop (PLL) Controller

Reference Guide

Literature Number: SPRU233A

April 2003

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3Title of DocSPRU233A

Preface

Read This First

About This Manual

Thisdocumentdescribestheoperation ofthe software-programmablephase-

locked loop (PLL) controller in the digital signal processors (DSPs) of the

TMS320C6000DSP family. This type of controller is used on the following

devices:

-TMS320C6711C

-TMS320C6712C

-TMS320C6713

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.

Related Documentation From Texas Instruments

The following documents describe the C6000devices and related support

tools. Copies of these documents are available on the Internet at www.ti.com.

Tip: Enter the literature number in the search box provided at www.ti.com.

TMS320C6000 CPU and Instruction Set Reference Guide (literature

number SPRU189) describes the TMS320C6000CPU architecture,

instruction set, pipeline, and interrupts for these digital signal processors.

TMS320C6000 Peripherals Reference Guide (literature number SPRU190)

describes the peripherals available on the TMS320C6000DSPs.

TMS320C6000 Technical Brief (literature number SPRU197) gives an

introduction to the TMS320C62xand TMS320C67xDSPs, develop-

ment tools, and third-party support.

TMS320C64x Technical Overview (SPRU395) gives an introduction to the

TMS320C64xDSP and discusses the application areas that are

enhanced by the TMS320C64x VelociTI.

Trademarks

4Phase-Locked Loop (PLL) Controller SPRU233A

TMS320C6000 Programmer’s Guide (literature number SPRU198)

describes ways to optimize C and assembly code for the

TMS320C6000DSPs and includes application program examples.

TMS320C6000 Code Composer Studio Tutorial (literature number

SPRU301)introduces the CodeComposerStudiointegrateddevelop-

ment environment and software tools.

Code Composer Studio Application Programming Interface Reference

Guide (literature number SPRU321) describes the Code Composer

Studioapplication programming interface (API), which allows you to

program custom plug-ins for Code Composer.

TMS320C6x Peripheral Support Library Programmer’s Reference

(literature number SPRU273) describes the contents of the

TMS320C6000peripheral support library of functions and macros. It

lists functions and macros both by header file and alphabetically,

provides a complete description of each, and gives code examples to

show how they are used.

TMS320C6000 Chip Support Library API Reference Guide (literature

numberSPRU401)describes a set ofapplicationprogramminginterfaces

(APIs) used to configure and control the on-chip peripherals.

Trademarks

Code Composer Studio, C6000, C62x, C64x, C67x, TMS320C6000,

TMS320C62x, TMS320C64x, TMS320C67x, and VelociTI are trademarks of

Texas Instruments.

Related Documentation From Texas Instruments / Trademarks

5Phase-Locked Loop (PLL) ControllerSPRU233A

Contents

1 Overview 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Functional Description 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Multiplier and Dividers 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Reset Controller 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Configuration 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Initialization 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.1 PLL Mode (PLLEN = 1) 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.2 Bypass Mode (PLLEN = 0) 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Power Down 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Power Wake Up 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Registers 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 PLL Controller Peripheral Identification Register (PLLPID) 15. . . . . . . . . . . . . . . . . . . . . . . .

4.2 PLL Control/Status Register (PLLCSR) 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 PLL Multiplier Control Register (PLLM) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.4 PLL Controller Divider Registers (PLLDIV0–3) 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.5 Oscillator Divider 1 Register (OSCDIV1) 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6Phase-Locked Loop (PLL) Controller SPRU233A

Figures

1 PLL Controller Block Diagram 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Reset Controller Lengthening the Internal Reset Signal 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 PLL Controller Peripheral Identification Register (PLLPID) 15. . . . . . . . . . . . . . . . . . . . . . . . . . .

4 PLL Control/Status Register (PLLCSR) 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 PLL Multiplier Control Register (PLLM) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 PLL Controller Divider Register (PLLDIV) 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Oscillator Divider 1 Register (OSCDIV1) 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1 PLL Controller Registers 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 PLL Controller Peripheral Identification Register (PLLPID) Field Descriptions 15. . . . . . . . . .

3 PLL Control/Status Register (PLLCSR) Field Descriptions 16. . . . . . . . . . . . . . . . . . . . . . . . . . .

4 PLL Multiplier Control Register (PLLM) Field Descriptions 18. . . . . . . . . . . . . . . . . . . . . . . . . . .

5 PLL Controller Divider Register (PLLDIV) Field Descriptions 19. . . . . . . . . . . . . . . . . . . . . . . . .

6 Oscillator Divider 1 Register (OSCDIV1) Field Descriptions 20. . . . . . . . . . . . . . . . . . . . . . . . . .

7Phase-Locked Loop (PLL) ControllerSPRU233A

Phase-Locked Loop (PLL) Controller

Thisdocumentdescribestheoperation ofthe software-programmablephase-

locked loop (PLL) controller in the digital signal processors (DSPs) of the

TMS320C6000DSP family. This type of controller is used on the following

devices:

-TMS320C6711C

-TMS320C6712C

-TMS320C6713

1 Overview

The PLL controller (Figure 1) features software-configurable PLL multiplier

controller, dividers (OSCDIV1, D0, D1, D2, and D3), and reset controller. The

PLL controller accepts an input clock, as determined by the logic state on the

CLKMODE0 pin, from the CLKIN pin or from the on-chip oscillator output

signal OSCIN. The PLL controller offers flexibility and convenience by way of

software-configurable multiplier and dividers to modify the input signal inter-

nally.TheresultingclockoutputsarepassedtotheDSPcore,peripherals,and

other modules inside the C6000DSP.

-The input reference clocks to the PLL controller:

JCLKIN: input signal from external oscillator (3.3V), CLKMODE0 = 1

JOSCIN: output signal from on-chip oscillator (1.2V), CLKMODE0 = 0

-The resulting output clocks from the PLL controller:

JAUXCLK: internal clock output signal directly from CLKIN or OSCIN.

JCLKOUT3: output of divider OSCDIV1.

JSYSCLK1: internal clock output of divider D1.

JSYSCLK2: internal clock output of divider D2.

JSYSCLK3: internal clock output of divider D3.

Refertoyourdevice-specificdatasheetonhowtheseinputsandoutputsofthe

PLL controller are used.

Overview

Phase-Locked Loop (PLL) Controller8SPRU233A

Figure 1. PLL Controller Block Diagram

CLKIN

OSCIN

CLKMODE0

Divider D0

÷1, ÷2,...÷32 PLL†

÷1, ÷2,...÷32

OSCDIV1

÷1, ÷2,...÷32

Divider D1 Divider D2

÷1, ÷2,...÷32 Divider D3

÷1, ÷2,...÷32

PLLEN

controller

Reset

PLL controller

AUXCLK SYSCLK1 SYSCLK2 SYSCLK3

CLKOUT3

PLLOUT

PLLM

×1, ×2,...×32

†See the device-specific datasheet for more details about the PLL.

Functional Description

9Phase-Locked Loop (PLL) ControllerSPRU233A

2 Functional Description

The following sections describe the multiplier, dividers, and reset controller in

the PLL controller.

2.1 Multiplier and Dividers

The PLL controller is capable of programming the PLL through the PLL multiplier

controlregister(PLLM)froma×1to×32multiplierrate(seethedevice-specific

datasheet for the PLL multiplier rates supported on your device). The clock

dividers (OSCDIV1, D0, D1, D2, and D3) are programmable from ÷1 to ÷32

divider ratio and may be disabled. The oscillator divider enable bit (OD1EN)

in the oscillator divider 1 register (OSCDIV1) determines the oscillator divider

output mode. When OD1EN = 0, theoscillator dividerisdisabled andno clock

isoutput; whenOD1EN =1,the oscillatordivider isenabledand aclockisout-

put. The divider enable bit (DnEN) in the PLL controller divider registers

(PLLDIVn) determines the divider output mode. When DnEN = 0, the divider

is disabled and no clock is output; when DnEN = 1, the divider is enabledand

a clock is output.

The input reference clock (either CLKIN or OSCIN) is directly output as the

auxiliaryclock(AUXCLK)forusebysomeperipherals.Forexample,themulti-

channelaudio serial port(McASP)uses AUXCLK togenerateaudio clocks.In

addition to AUXCLK, the input reference clock is directly input to the oscillator

divider (OSCDIV1). If OSCDIV1 is enabled, OD1EN = 1, the input reference

clock is divided down by the value in the oscillator divider ratio bits (RATIO) in

OSCDIV1. The output from OSCDIV1 is the output clock CLKOUT3.

The divider D0 and the PLL may also be bypassed. The PLL enable bit

(PLLEN) in the PLL control/status register (PLLCSR) determines the PLL

controller mode. When PLLEN = 1, PLL mode, D0 and PLL are used; when

PLLEN = 0, bypass mode, D0 and PLL are bypassed and the input reference

clock is directly input to dividers D1, D2, and D3.

Whenin PLL mode (PLLEN =1),the input reference clockissuppliedto divid-

erD0. If D0 is enabled, D0EN =1, theinput reference clock is divided down by

the value in the PLL divider ratio bits (RATIO) in PLLDIV0. The output from

divider D0 is input to the PLL. The PLL multiplies the clock by the value in the

PLL multiplier bits (PLLM) in the PLL multiplier control register (PLLM). The

output from the PLL (PLLOUT) is input to dividers D1, D2, and D3.

When enabled (DnEN = 1), the dividers D1, D2, and D3 divide down by the

value in RATIO in PLLDIVnthe output clock of the PLL. The output clocks of

dividers D1, D2, and D3 have 50% duty cycle and are SYSCLK1, SYSCLK2,

and SYSCLK3, respectively.

Functional Description

Phase-Locked Loop (PLL) Controller10 SPRU233A

2.2 Reset Controller

At power up, the device RESET signal may not be asserted long enough to

waitfortheon-chiporoff-chiposcillatortostabilize.Thismeanstheinputrefer-

enceclock(eitherCLKINorOSCIN)maybeabadclockwhenadeviceRESET

signal is deasserted high. After RESET is deasserted, the reset controller

lengthenstheasynchronousinternalresetsignaltoensurethattheinputclock

source is stable.

The reset controller resides within the PLL controller and the main function is

to internally lengthen the reset signal from the RESET input pin until the input

clock source is stable (after 512 CLKIN cycles or 4096 OSCIN cycles). This

istoensurethattherestofthedevicewillseetheinternalresetdeassertedonly

aftertheinputclockisstabilized.Figure2showsthelengtheningoftheinternal

reset signal.

ThePLLcontrollermultiplieranddividersarebypassedwhentheinternalreset

signalislow.ThefrequencyofallclockoutputsofthePLLcontroller(AUXCLK,

SYSCLK1, SYSCLK2, SYSCLK3, and CLKOUT3) are fixed to the input

reference clock (CLKIN or OSCIN) divided by 8. After 512 CLKIN cycles or

4096 OSCINcycles,theresetcontrollerbringsthedeviceoutofresetandsets

the oscillator input stable bit (STABLE) in the PLL control/status register

(PLLCSR). The dividers are used after this point and are set to their default

divide ratio.

Values are latched into the registers at the rising edge of RESET.

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