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Here is the VHDL code for FULL ADDER:
LIBRARY ieee ;
USE ieee.std_logic_1164.all ;
ENTITY fulladd IS
PORT ( Cin, x, y : IN STD_LOGIC ;
s, Cout : OUT STD_LOGIC ) ;
END fulladd ;
ARCHITECTURE beh OF fulladd IS
BEGIN
s <= x XOR y XOR Cin ;
Cout <= (x AND y) OR (Cin AND x) OR (Cin AND y) ;
END beh ;
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