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