The PERR# line is only used during data phases, once a target has been selected. If a parity error is detected during an address phase (or the data phase of a Special Cycle), the devices which observe it assert the SERR# (System error) line.
The PERR# line is only used during data phases, o,nce a target has been selected. If a parity error is detected during an address phase (or the data phase of a Special Cycle) the devices which observe it assert the SERR# (System error) line.