ARM ARM DUI 0224I manual Signals, Numbering

Preface

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.

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