For permitted transactions, the associated response (read data or write
response) is forwarded from the manager interface to the subordinate interface. For
blocked transactions, the AXI EPU IP core
generates a response and issues it on the subordinate interface. This applies
independently to both reads and writes. When a transaction is blocked, writes are
prevented and reads return a fixed data value 0xDEADB10C
(replicated as required to fill the read data width).
Additional actions when blocking a transaction are configurable:
- Return DECERR or OKAY response
- Record transaction information (can be read from registers)
- Assert an interrupt output (with associated interrupt handling registers)