{HEAD ~ Reference delay unit} 205 generates {TAIL ~ a reference signal} by delaying its input signal by an x unit time period, where x is an integer 
generates
{ HEAD ~ Reference delay unit } 205 generates { TAIL ~ a reference signal } by delaying its input signal by an x unit time period , where x is an integer
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH