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A.13.2. APB interface signals

Table A.26 shows the APB interface signals.

Table A.26. APB interface signals
NameI/OSource or destinationDescription
PADDRDBG[12:2]ICoreSight APB devices

Programming address.

PADDRDBG31I

APB address bus bit [31]:

0

Not an external debugger access.

1

External debugger access.

PENABLEDBGIIndicates a second and subsequent cycle of a transfer.
PSELDBGI

Debug registers select:

0

Debug registers not selected.

1

Debug registers selected.

PWDATADBG[31:0]IAPB write data.
PWRITEDBGIAPB read/write signal.
PRDATADBG[31:0]OAPB read data bus.
PREADYDBGO

APB slave ready. An APB slave can assert PREADY to extend a transfer.

PSLVERRDBGOAPB slave error signal.

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