Key To Timing Diagram Conventions - ARM ARM1176JZF-S Technical Reference Manual

Conventions
ARM DDI 0301H
ID012310
Glossary Read this for definitions of terms used in this book.
Conventions that this book can use are described in:
• Typographical
• Timing diagrams
• Signals on page xxv.
Typographical
The typographical conventions are:
italic Highlights important notes, introduces special terminology, denotes
internal cross-references, and citations.
bold Highlights interface elements, such as menu names. Denotes signal
names. Also used for terms in descriptive lists, where appropriate.
Denotes text that you can enter at the keyboard, such as commands, file
monospace
and program names, and source code.
Denotes a permitted abbreviation for a command or option. You can enter
monospace
the underlined text instead of the full command or option name.
Denotes arguments to monospace text where the argument is to be
monospace italic
replaced by a specific value.
Denotes language keywords when used outside example code.
monospace bold
< and > Enclose replaceable terms for assembler syntax where they appear in code
or code fragments. For example:
MRC p15, 0 <Rd>, <CRn>, <CRm>, <Opcode_2>
Timing diagrams
The figure named Key to timing diagram conventions explains the components used in timing
diagrams. Variations, when they occur, have clear labels. You must not assume any timing
information that is not explicit in the diagrams.
Shaded bus and signal areas are undefined, so the bus or signal can assume any value within the
shaded area at that time. The actual level is unimportant and does not affect normal operation.
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Clock
HIGH to LOW
Transient
HIGH/LOW to HIGH
Bus stable
Bus to high impedance
Bus change
High impedance to stable bus

Key to timing diagram conventions

Preface
xxiv