so that the input to said feedback element is either the data input signal or a combination thereof with {HEAD ~ the output} of {TAIL ~ the feedback element}, as determined by said control signal 
of
so that the input to said feedback element is either the data input signal or a combination thereof with { HEAD ~ the output } of { TAIL ~ the feedback element } , as determined by said control signal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH