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