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