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--Nama file : substractx.vbe

--Deskripsi : blok substractor 2 input 1 bit

--Author    : Mas Adit

--Tanggal  : 29 Agustus 2001

entity substractx is

port (

        a : in bit;

        b : in bit;

        bin : in bit;

        diff : out bit;

        bout : out bit;

        vdd : in bit;

        vss : in bit

);

end substractx;

architecture vbe of substractx is

begin

diff <= a xor b xor bin;

bout <= (bin and not (a xor b)) or ((not a) and b);

assert ((vdd = '1') and (vss = '0'))

report "power supply is missing on substractx"

severity warning;

end vbe;