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+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity half_adder is
+ port (
+ i_bit0 : in std_logic_vector(0 downto 0);
+ i_bit1 : in std_logic_vector(0 downto 0);
+ o_sum : out std_logic_vector(0 downto 0);
+ o_carry : out std_logic_vector(0 downto 0)
+ );
+end half_adder;
+
+architecture rtl of half_adder is
+begin
+ o_sum <= i_bit0 xor i_bit1;
+ o_carry <= i_bit0 and i_bit1;
+end rtl;