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full subtractor

 library ieee;

use ieee.std_logic_1164.all;

entity fullsubtractor is

port(A,B,Cin:in std_logic; borrow,difference:out std_logic);

end fullsubtractor;

architecture FS of fullsubtractor is

begin

difference <= A xor B xor Cin;

borrow<= (not A and B) or (not A and Cin) or (B and Cin);

end FS;

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