The Request Phase Parity
The Request Agent drives the two Request Phase parity bits, AP[1:0]#, at the start of the BCLK cycle immediately following the Request Phase:
It drives AP0# to either an electrical high or low to force an even number of electrical lows in the overall pattern consisting of A[35:24]# in Packet A, and A[23:3]# and REQ[4:0]# in Packet B.
It drives AP1# to either an electrical high or low to force an even number of electrical lows in the overall pattern consisting of A[23:3]# and REQ[4:0]# in Packet A, and A[35:24]# in Packet B.
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