As long as the periodic pulse is detected by the slave processor, {TAIL ~ the output} of {HEAD ~ the master processor} remains enabled and the output of the slave processor is disabled 
As long as the periodic pulse is detected by the slave processor , { TAIL ~ the output } of { HEAD ~ the master processor } remains enabled and the output of the slave processor is disabled
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH