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