Texas Instruments TMS320C80 User manual

TMS320C80 to TMS320C82

Software Compatibility

User’s Guide

1995 Digital Signal Processing Products

SPRU154

Printed in U.S.A., November, 1995

M418017-9741 revision *

TMS320C80 to TMS320C82

Software Compatibility

User’s Guide

SPRU154

November 1995

Printed on Recycled Paper

IMPORTANT NOTICE

Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any

semiconductor product or service without notice, and advises its customers to obtain the latest

version of relevant information to verify, before placing orders, that the information being relied

on is current.

TIwarrantsperformanceofitssemiconductorproductsandrelatedsoftwaretothespecifications

applicableatthetimeofsaleinaccordancewithTI’sstandardwarranty.Testingandotherquality

control techniques are utilized to the extent TI deems necessary to support this warranty.

Specific testing of all parameters of each device is not necessarily performed, except those

mandated by government requirements.

Certain applications using semiconductor products may involve potential risks of death,

personal injury, or severe property or environmental damage (“Critical Applications”).

TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR

WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES

OR SYSTEMS OR OTHER CRITICAL APPLICATIONS.

Inclusion of TI products in such applications is understood to be fully at the risk of the customer.

Useof TIproducts insuch applicationsrequires thewritten approvalof anappropriate TIofficer.

Questions concerning potential risk applications should be directed to TI through a local SC

sales office.

In order to minimize risks associated with the customer’s applications, adequate design and

operating safeguards should be provided by the customer to minimize inherent or procedural

hazards.

TI assumes no liability for applications assistance, customer product design, software

performance, or infringement of patents or services described herein. Nor does TI warrant or

representthatanylicense,eitherexpressorimplied,isgrantedunderanypatentright,copyright,

mask work right, or other intellectual property right of TI covering or relating to any combination,

machine, or process in which such semiconductor products or services might be or are used.

How to Use This Manual

Preface

Read This First

About This Manual

TheTMS320C80andtheTMS320C82arethefirsttwomembers

of the ’C8x family of high-performance DSP devices. This guide

explainshowto portsoftwaredeveloped foroneofthesedevices

totheother.Italsopresentsasetof softwarecompatibilityguide-

lines for developing software that will run on either device.

How to Use This Manual

Thisdocumentcontainsthreechapters that dealwithdifferentis-

sues related to compatibility:

Chapter 1 discusses software-related differences between

the ’C80 and the ’C82.

Chapter 2 discusses guidelines and techniques for develop-

ing software that can run on both the ’C80 and the ’C82.

Chapter 3 discusses guidelines and techniques for prototyp-

ing ’C82 software using a ’C80.

If you need background information about the differences be-

tween the ’C80 and the ’C82, read Chapter 1 before going on to

Chapter 2 and Chapter 3.

If you already understand the differences between the ’C80 and

the’C82,thenyoucangodirectlytoChapter2anduseChapter1

as reference material.

This user’s guide contains information at a general level to guide

youincompletingprograms.Itdoesnotdiscussallissuesrelated

tothe’C80andthe’C82;useyourbestjudgementinapplyingthe

methods discussed in Chapter 2 and Chapter 3 to your applica-

tion.

Related Documentation From Texas Instruments

iv TMS320C80 to TMS320C82 Software Compatibility User’s Guide

Related Documentation From Texas Instruments

ThefollowingbooksdescribetheTMS320C8xand relatedsupport

tools.ToobtainacopyofanyoftheseTIdocuments,calltheTex-

as Instruments Literature Response Center at (800) 477–8924.

When ordering, please identify the book by its title and literature

number.

TMS320C80 Multimedia Video Processor Data Sheet

(literature number SPRS023) describes the features of the

’C80 device and provides pinouts, electrical specifications,

and timings for the device.

TMS320C8x System-Level Synopsis

(literature number

SPRU113) describes the ’C8x features, development

environment, architecture, memory organization, and

communication network (the crossbar).

TMS320C80 C Source Debugger User’s Guide

(literature

number SPRU107) describes the ’C8x master processor

and parallel processor C source debuggers. This manual

providesinformationaboutthefeaturesand operation ofthe

debuggers and the parallel debug manager; it also includes

basic information about C expressions and a description of

progress and error messages.

TMS320C80 Code Generation Tools User’s Guide

(literature

number SPRU108) describes the ’C8x code generation

tools. This manual provides information about the features

and operation of the linker, the master processor (MP) C

compiler and assembler, and the parallel processor (PP) C

compiler and assembler. It also describes the common

object file format (COFF) andshowsyouhowto linkMP and

PP code.

TMS320C80 Master Processor User’s Guide

(literature

number SPRU109) describes the ’C8x master processor

(MP). This manual provides information about the MP

features, architecture, operation, and assembly language

instruction set; it also includes sample applications that

illustrate various MP operations.

TMS320C80 Multitasking Executive User’s Guide

(literature

number SPRU112) describes the ’C8x multitasking execu-

tive software. This manual provides information about the

multitasking executive’s software features, operation, and

interprocessor communications. Italso includesa listof task

error codes.

Related Documentation From Texas Instruments / If You Need Assistance

Read This First

TMS320C80 Parallel Processor User’s Guide

(literature num-

ber SPRU110) describes the ’C8x parallel processor (PP).

This manual provides information aboutthePPfeatures, ar-

chitecture, operation, and assembly language instruction

set.Italsoincludes softwareapplicationsandoptimizations.

TMS320C80TransferControllerUser’sGuide

(literaturenum-

ber SPRU105) describes the ’C80 transfer controller (TC).

This manual provides information about the TC features,

functional blocks, and operation. It also includes examples

of block-write operations for big- and little-endian modes.

TMS320C80 Video Controller User’s Guide

(literature number

SPRU111) describes the ’C80 video controller (VC). This

manual provides information about the VC features, archi-

tecture, and operation. It also includes procedures and ex-

amples for programming the serial register transfer (SRT)

controller and the frame timer registers.

If You Need Assistance. . .

If you want to. . . Do this. . .

Request more information

about Texas Instruments

Digital Signal Processing

(DSP) products

Call the CRC†hotline:

(800) 336–5236

Or write to:

Texas Instruments Incorporated

Market Communications Manager, MS 736

P.O. Box 1443

Houston, Texas 77251–1443

Order Texas Instruments

documentation Call the CRC†hotline:

(800) 336–5236

Ask questions about product

operation or report suspected

problems

Call the DSP hotline:

(713) 274–2320

Report mistakes in this

document or any other TI

documentation

Fill out and return the reader response

card at the end of this book, or send your

comments to:

Texas Instruments Incorporated

Technical Publications Manager, MS 702

P.O. Box 1443

Houston, Texas 77251–1443

†Texas Instruments Customer Response Center

vi TMS320C80 to TMS320C82 Software Compatibility User’s Guide

Contents

vii

Contents

1 Comparison of the ’C80 and ’C82 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Describes differences between the ’C80 and ’C82 that affect software compatibility.

1.1 Overview of ’C80 and ’C82 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Parallel Processor Differences 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Transfer Controller Differences 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.1 Number of Externally Initiated Packet Transfer Requests 1-4. . .

1.3.2 RAM Bank Configuration Mechanisms 1-4. . . . . . . . . . . . . . . . . . .

1.4 Video Controller Differences 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Memory Differences 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5.1 Data RAMs 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5.2 Parameter RAMs 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5.3 Caches 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Programming for Compatibility 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Provides techniques for programming ’C80/’C82-compatible software.

2.1 Programming Considerations 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Obtaining Device-Specific Information 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.1 Determining the Device that is Executing your Software (MP) 2-3.

2.2.2 Determining the Device that is Executing your Software (PP) 2-3. .

2.2.3 Initializing a PP’s Stack Pointer 2-4. . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.4 Counting the Number of PPs 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Technique #1: Using Only Common RAM 2-6. . . . . . . . . . . . . . . . . . . . . . . .

2.3.1 Advantages of Technique #1 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.2 Disadvantages of Technique #1 2-6. . . . . . . . . . . . . . . . . . . . . . . . .

2.3.3 Implementing Technique #1 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.4 Considerations When Using Technique #1 2-7. . . . . . . . . . . . . . . .

2.4 Technique #2: Using Pointers to Allocate RAM 2-8. . . . . . . . . . . . . . . . . . .

2.4.1 Advantages of Technique #2 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.2 Disadvantages of Technique #2 2-8. . . . . . . . . . . . . . . . . . . . . . . . .

2.4.3 Implementing Technique #2 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.4 Considerations When Using Technique #2 2-9. . . . . . . . . . . . . . . .

Contents

viii TMS320C80 to TMS320C82 Software Compatibility User’s Guide

3 Prototyping ’C82 Code on the ’C80 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Describes techniques for emulating the ’C82’s RAM with the ’C80’s RAM.

3.1 Overview 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Emulating the ’C82’s Data RAMs 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.1 Emulating the ’C82’s PP0 Data RAM 0 and PP1 Data RAM 0 3-3.

3.2.2 Emulating the ’C82’s PP0 Data RAM 1 and PP1 Data RAM 1 3-3.

3.3 Emulating the ’C82’s Parameter RAMs 3-4. . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.1 Emulating the PP Parameter RAMs 3-4. . . . . . . . . . . . . . . . . . . . . .

3.3.2 Emulating the MP Parameter RAM 3-5. . . . . . . . . . . . . . . . . . . . . .

3.4 Prototyping Code Using Linker Command Files 3-6. . . . . . . . . . . . . . . . . .

3.4.1 PP-Relative Addressing 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.2 Map Files 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.3 Linking Your ’C82 Code for Prototyping on a ’C80 3-7. . . . . . . . .

3.4.4 Linking your Code for a ’C82 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.5 MP Linker Command Files 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4.6 Considerations when Using Linker Command Files 3-15. . . . . . .

A The ’C80 and ’C82 Memory Maps A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Provides ’C80 and ’C82 memory maps.

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