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+LIBRARY IEEE;
+USE IEEE.STD_LOGIC_1164.ALL;
+USE IEEE.STD_LOGIC_UNSIGNED.ALL;
+
+entity full_adder_1 is
+ port (A, B, CI:in std_logic; S, CO: out std_logic);
+end full_adder_1;
+
+architecture behavior of full_adder_1 is
+begin
+ S <= (A XOR B) XOR CI;
+ CO <= (A AND B) OR (B AND CI) OR (CI AND A);
+end architecture;