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