APB

Signals

These signals will be used in the interface of the register map.

Signal	Width	Direction	Description
psel	1	input	APB select
paddr	>1	input	APB address
penable	1	input	APB enable
pwrite	1	input	APB write
pwdata	>1	input	APB write data
pstrb	>1	input	APB write strobe
prdata	>1	output	APB read data
pready	1	output	APB ready
pslverr	1	output	APB slave error

Note

Specific bit widths for buses are defined in globcfg section of a csrconfig file.

Implementation details:

• APB4 slave

• pprot signal is not implemented

• pslverr tied to 0 - slave is always OKAY

Protocol

Refer to official ARM documentation: IHI0024C AMBA® APB Protocol Version: 2.0.