Circuit operation definition is performed in a front end environment with access to integrated circuit computer aided design tools providing logic level and {HEAD ~ layout level information} concerning {TAIL ~ the integrated circuit} 
concerning
Circuit operation definition is performed in a front end environment with access to integrated circuit computer aided design tools providing logic level and { HEAD ~ layout level information } concerning { TAIL ~ the integrated circuit }
OTH OTH OTH OTH 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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL