OS21, ARM

Preface

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Preface

Document identification and control

Each book carries a unique ADCS identifier of the form:

ADCS nnnnnnnx

where nnnnnnn is the document number, and x is the revision.

Whenever making comments on a document, the complete identification ADCS nnnnnnnx

should be quoted.

Conventions used in this guide

General notation

The notation in this document uses the following conventions:

●

sample code

, keyboard input and file names,

●

variables and code variables,

●

code comments

,

●

screens, windows and dialog boxes,

●

instructions.

Hardware notation

The following conventions are used for hardware notation:

●

REGISTER NAMES and FIELD NAMES,

●

PIN NAMES and SIGNAL NAMES.

Software notation

Syntax definitions are presented in a modified Backus-Naur Form (BNF). Briefly:

1.

Terminal strings of the language, that is, strings not built up by rules of the language are

printed in teletype font. For example, void.

2.

Nonterminal strings of the language, that is, strings built up by rules of the language are

printed in italic teletype font. For example, name.

3.

If a nonterminal string of the language starts with a nonitalicized part, it is equivalent to

the same nonterminal string without that nonitalicized part. For example, vspace-

name

.

4.

Each phrase definition is built up using a double colon and an equals sign to separate

the two sides (‘::=’).

5.

Alternatives are separated by vertical bars (‘|’).

6.

Optional sequences are enclosed in square brackets (‘[’ and ‘]’).

7.

Items which may be repeated appear in braces (‘{’ and ‘}’).

Acknowledgements

ARM is a registered trademark of ARM Ltd.