ARM9TDMI 查看數據表（PDF） - Unspecified

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ARM9TDMI

ARM9TDMI Processor Core

Unspecified 

ARM DDI 0180A

Preface

monospace italic

monospace bold

< and >

Denotes arguments to monospace text where the argument is to be

replaced by a specific value.

Denotes language keywords when used outside example code.

Angle brackets enclose replaceable terms for assembler syntax

where they appear in code or code fragments. They appear in

normal font in running text. For example:

• MRC p15, 0 <Rd>, <CRn>, <CRm>, <Opcode_2>

• The Opcode_2 value selects which register is accessed.

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.

&ORFN

+,*+WR/2:

7UDQVLHQW

+,*+/2:WR+,*+

%XVVWDEOH

%XVWRKLJKLPSHGDQFH

%XVFKDQJH

+LJKLPSHGDQFHWRVWDEOHEXV

Key to timing diagram conventions

Signals

The signal conventions are:

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 and LOW for active-LOW signals.

Lower-case n

Denotes an active-LOW signal.

Copyright © 2000 ARM Limited. All rights reserved.

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