In this scheme, look up table of Φv1 or Φv2 is selected based on {HEAD ~ the output} from {TAIL ~ the logical OR gate} by feeding this output to the chip selection pin of the ROM chips 
from
In this scheme , look up table of Φv1 or Φv2 is selected based on { HEAD ~ the output } from { TAIL ~ the logical OR gate } by feeding this output to the chip selection pin of the ROM chips
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 TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH