ENTITY dp_mux_x4_buf IS
PORT (
  sel	: in  BIT;
  sel0	: out BIT;
  sel1	: out BIT;
  vdd	: in  BIT;
  vss	: in  BIT
);
END dp_mux_x4_buf;

ARCHITECTURE vbe OF dp_mux_x4_buf IS

BEGIN
  ASSERT (vdd and not vss)
  REPORT "power supply is missing on dp_mux_x4_buf"
  SEVERITY WARNING;

  sel1 <= sel;
  sel0 <= not sel;

END;