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

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control techniques are utilized to the extent TI deems necessary to support this warranty.
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TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR
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Copyright 1995, Texas Instruments Incorporated

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
v
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: [phone]
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
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.