If contention is noted between {TAIL ~ the system inputs} to the pin, and outputs from the device to {HEAD ~ the pin}, contention error notices are provided to the user 
If contention is noted between { TAIL ~ the system inputs } to the pin , and outputs from the device to { HEAD ~ the pin } , contention error notices are provided to the user
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH