In the case of a negative logic signal, the signal is active low where {HEAD ~ the logically true state} corresponds to {TAIL ~ a logic level} zero 
corresponds to
In the case of a negative logic signal , the signal is active low where { HEAD ~ the logically true state } corresponds to { TAIL ~ a logic level } zero
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH