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