In other words, the first and second delay units 201 and 204 each provide {HEAD ~ a delay} equal to {TAIL ~ a single unit time period}, while the reference delay unit 205 provides a delay equal to an integer unit time period that is set by the circuit designer 
equal to
In other words , the first and second delay units 201 and 204 each provide { HEAD ~ a delay } equal to { TAIL ~ a single unit time period } , while the reference delay unit 205 provides a delay equal to an integer unit time period that is set by the circuit designer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL 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 OTH OTH OTH OTH