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GENERIC(width : POSITIVE := 4);
PORT ( A, B : IN STD_LOGIC_VECTOR (width-1 DOWNTO 0);
Sum : OUT STD_LOGIC_VECTOR (width-1 DOWNTO 0);
carry : OUT STD_LOGIC);
END ripple_carry_adder;
ARCHITECTURE Behavioral OF ripple_carry_adder IS
COMPONENT half_adder IS
PORT ( a, b : IN STD_LOGIC;
sum : OUT STD_LOGIC;
carry : OUT STD_LOGIC);
END COMPONENT half_adder;
COMPONENT full_adder IS
PORT ( a, b, c : IN STD_LOGIC;
sum : OUT STD_LOGIC;
carry : OUT STD_LOGIC);
END COMPONENT full_adder;
SIGNAL C : STD_LOGIC_VECTOR(width-1 DOWNTO 0);
BEGIN
rca: FOR i IN 0 TO width-1 GENERATE
lsb : IF i = 0 GENERATE
ADD0 : half_adder PORT MAP (a => A(0), b => B(0), sum => SUM(0), carry => C(0));
END GENERATE lsb;
Upper_bits : IF i > 0 GENERATE
ADDX : full_adder PORT MAP (a => A(i), b => B(i), c => C(i-1), sum => SUM(i), carry => C(i));
END GENERATE Upper_bits;
END GENERATE rca;
carry <= C(width-1);
END Behavioral;
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