ENTITY rf2_out_buf IS
PORT (
  ck     : in    BIT;
  nck    : inout BIT;
  xcks	 : out   BIT;
  vdd	 : in    BIT;
  vss	 : in    BIT
);
END rf2_out_buf;

ARCHITECTURE VBE OF rf2_out_buf IS

BEGIN
  ASSERT (vdd and not (vss))
  REPORT "power supply is missing on rf2_out_buf"
  SEVERITY WARNING;

  nck  <= not ck;
  xcks <= not nck;

END;