ENTITY rf2_mid_buf IS
PORT (
  selra   : in  BIT;
  selrb   : in  BIT;
  selw   : in  BIT;
  nck    : in  BIT;
  reada	 : out BIT;
  readb	 : out BIT;
  write  : out BIT;
  vdd	 : in  BIT;
  vss	 : in  BIT
);
END rf2_mid_buf;

ARCHITECTURE VBE OF rf2_mid_buf IS

BEGIN
  ASSERT (vdd and not (vss))
  REPORT "power supply is missing on rf2_mid_buf"
  SEVERITY WARNING;

  reada <= selra;
  readb <= selrb;
  write <= selw and nck;

END;