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