A.3 APB master interface signals

The APB master interface processes several input and output APB signals.

The following table shows the signals that are used by the APB master interface.

Table A-3 APB master interface signals

Signal name Direction Source or destination Description
psel_m Output Process-specific part Slave select signal. Indicates that the current transfer is intended for the Flash controller.
penable_m Output Process-specific part Strobe to time all accesses. Indicates the start of the second cycle of an APB transfer.
paddr_m[11:0] Output Process-specific part Address bus.
pstrb_m[3:0] Output Process-specific part

Write strobe port. Each bit refers to a byte in the pwdata_m signal:

[3] pwdata_m[31:24].

[2] pwdata_m[23:16].

[1] pwdata_m[15:8].

[0] pwdata_m[7:0].

pwrite_m Output Process-specific part APB transfer direction. Write only.
pwdata_m[31:0] Output Process-specific part 32-bit write data bus.
prdata_m[31:0] Input Process-specific part 32-bit read data bus.
pready_m Input Process-specific part Driven LOW when extra wait states are required to complete access to the external registers.
pslverr_m Input Process-specific part Driven HIGH when an error response is received from an access to the external registers.


APB signals that are not shown in the table are not used in GFC-100.
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