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