{HEAD ~ The output} of {TAIL ~ the sync mark detector} is enabled according to the current state of the state machine, i.e., at a predetermined sample period interval 
of
{ HEAD ~ The output } of { TAIL ~ the sync mark detector } is enabled according to the current state of the state machine , i.e. , at a predetermined sample period interval
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH