The tenth FF receives {HEAD ~ the output signal} of the second multiplexer, outputs a write data strobe , and is driven by {TAIL ~ the output signal} of the XOR gate 
The tenth FF receives { HEAD ~ the output signal } of the second multiplexer , outputs a write data strobe , and is driven by { TAIL ~ the output signal } of the XOR gate
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH