a second logic unit which logically operates the first data and the second transfer control signal, and outputs {HEAD ~ the result} of {TAIL ~ the logical operation}; and 
of
a second logic unit which logically operates the first data and the second transfer control signal , and outputs { HEAD ~ the result } of { TAIL ~ the logical operation } ; and
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH