Motorola MVME2600 Series User Manual download pdf (Page 467)

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101

D-1

DS-Record Format

Introduction

The S-record format for output modules was devised for the

purpose of encoding programs or data files in a printable format for

transfer between computer systems. The transfer process can thus

be visually monitored and the S-records can be edited more easily.

S-Record Content

When viewed by the user, S-records are essentially character

strings made of five fields: the record type, record length, memory

address, code/data, and checksum. Each byte of binary data is

encoded as a 2-character hexadecimal number: the first character

representing the high-order 4 bits, and the second the low-order 4

bits of the byte.

The contents of the S-record field are:

Table D-1. S-Record Fields

Field

Printable

Characters

Contents

Type 2 S-record type, such as S0 or S1

Record

Length

2 The count of the character pairs in the record, excluding the

type and record length

Address 4, 6, or 8 The 2-, 3-, or 4-byte address at which the data Þeld is to be

loaded into memory

Code/Data 0-n From 0 to n bytes of executable code, memory-loadable data,

or descriptive information. For compatibility with

teletypewriters, some programs may limit the number of bytes

to as few as 28 (56 printable characters in the S-record).

1 2 ... 462 463 464 465 466 467 468 469 470 471 472 ... 517 518

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Motorola MVME2600 Series User Manual Page 467

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