The pin test buffer inputs {HEAD ~ external inputs} to {TAIL ~ a pin}, and outputs to the same pin from the device 
to
The pin test buffer inputs { HEAD ~ external inputs } to { TAIL ~ a pin } , and outputs to the same pin from the device
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH