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.

Note:

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