ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Preface
Conventions
This manual employs typographic and other conventions intended to improve its ease of use.
General typographic conventions
Signals
Numbers
Bit values
typewriter Is used for assembler syntax descriptions, pseudocode descriptions of instructions,
and source code examples. In the cases of assembler syntax descriptions and
pseudocode descriptions, see the additional conventions below.
The typewriter style is also used in the main text for instruction mnemonics and for
references to other items appearing in assembler syntax descriptions, pseudocode
descriptions of instructions and source code examples.
italic Highlights important notes, introduces special terminology, and denotes internal
cross-references and citations.
bold Is used for emphasis in descriptive lists and elsewhere, where appropriate.
SMALL CAPITALS Are used for a few terms that have specific technical meanings. Their meanings can
be found in the Glossary.
In general this specification does not define processor signals, but it does include some signal examples and
recommendations. It uses the following signal conventions:
Signal level The level of an asserted signal depends on whether the signal is active-HIGH or
active-LOW. Asserted means:
HIGH for active-HIGH signals
LOW for active-LOW signals.
Lower-case n At the start or end of a signal name denotes an active-LOW signal.
Numbers are normally written in decimal. Binary numbers are preceded by 0b, and hexadecimal numbers
by 0x and written in a typewriter font.
Values of bits and bitfields are normally given in binary, in single quotes. The quotes are normally omitted
in encoding diagrams and tables.
Pseudocode descriptions
This manual uses a form of pseudocode to provide precise descriptions of the specified functionality. This
pseudocode is written in a typewriter font, and is described in Appendix I Pseudocode Definition.
xviii Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B