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