a pull up unit which pulls up an output terminal of {TAIL ~ the data transfer unit} in response to an output signal from {HEAD ~ the first logic unit} 
a pull up unit which pulls up an output terminal of { TAIL ~ the data transfer unit } in response to an output signal from { HEAD ~ the first logic unit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD