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Preface
ARM DUI 0224F Copyright © 2003-2007 ARM Limited. All rights reserved. xxi
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.
Prefix A Denotes global Advanced eXtensible Interface (AXI) signals:
Prefix AR Denotes AXI read address channel signals.
Prefix AW Denotes AXI write address channel signals.
Prefix B Denotes AXI write response channel signals.
Prefix C Denotes AXI low-power interface signals.
Prefix H Denotes Advanced High-performance Bus (AHB) signals.
Prefix P Denotes Advanced Peripheral Bus (APB) signals.
Prefix R Denotes AXI read data channel signals.
Prefix W Denotes AXI write data channel signals.
Numbering
The numbering convention is:
<size in bits>'<base><number>
This is a Verilog method of abbreviating constant numbers. For example:
• 'h7B4 is an unsized hexadecimal value.
• 'o7654 is an unsized octal value.
• 8'd9 is an eight-bit wide decimal value of 9.
• 8'h3F is an eight-bit wide hexadecimal value of
0x3F
. This is
equivalent to b00111111.
• 8'b1111 is an eight-bit wide binary value of b00001111.