During accessing of the output driver, {TAIL ~ the blocking polarity potential} is isolated from gating inputs of the pull up and pull down {HEAD ~ devices} of the output driver 
During accessing of the output driver , { TAIL ~ the blocking polarity potential } is isolated from gating inputs of the pull up and pull down { HEAD ~ devices } of the output driver
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH