Motorola MVME2700 Series Manuel d'utilisateur télécharger pdf (Page 471)

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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

Character

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 field 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 ... 466 467 468 469 470 471 472 473 474 475 476 ... 507 508

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Motorola MVME2700 Series Manuel d'utilisateur Page 471

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