Half Subtractor

 Half Subtractor 

 

CODE

 

library IEEE;

use IEEE STD_LOGIC_1164.all;

entity half_sub_df is

    port(a,b:in STD_LOGIC;

            diff, borrow:out STD_LOGIC);

end half_sub_df;

architecture data_flow of half_sub_df is

begin

    diff<=a xor b;

    borrow<=((not a) and b);

                  end data_flow;