ENTITY rom_dec_adbuf IS
PORT (
  ad     : in  BIT;
  adx    : out BIT;
  nadx   : inout BIT;
  vdd    : in  BIT;
  vss    : in  BIT
);
END rom_dec_adbuf;

ARCHITECTURE VBE OF rom_dec_adbuf IS

BEGIN
  ASSERT (vdd and not (vss))
  REPORT "power supply is missing on rom_dec_adbuf"
  SEVERITY WARNING;

  nadx <= not ad;
  adx  <= not nadx;
END;