FULL SUBTRACTOR-(Behavioral)

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

entity FA is

    Port ( A,B,C : in  STD_LOGIC;

           Diff,Borw: out  STD_LOGIC);

end FA;

architecture Behavioral of HA is

begin

process(A,B,C)

begin

if(A='0') then
            Diff<=B xor C ; Borw<=B or C ;

else 
            Diff<=B xnor C ; Borw<=B and C ;

end if;

end process;

end Behavioral;