Subversion Repositories special_functions_unit

-- FULL ADDER

-- universidad Pedagogica y Tecnologica de Colombia.

-- Facultad de ingenieria.

-- Escuela de ingenieria Electronica - extension Tunja.

-- Semillero de investigacion DDA y PDI

-- Autor: Cristhian Fernando Moreno Manrique

-------------------------------------------------------

LIBRARY ieee;

USE ieee.std_logic_1164.all;

-------------------------------------------------------

entity FA is

        port(

                i_term1 :in std_logic;

                i_term2 :in std_logic;

                i_cin           :in std_logic;

                o_sum           :out std_logic;

                o_cout  :out std_logic

        );

end entity;

-------------------------------------------------------                         

architecture main of FA is

        signal s_xor: std_logic;

begin

        s_xor           <= i_term1 xor i_term2;

        o_cout  <= (i_term1 and i_term2) or (i_cin and s_xor);

        o_sum   <=  s_xor xor i_cin;

----    option 2:

--      o_cout  <= (i_term1 and i_term2) or (i_term1 and i_cin) or (i_term2 and i_cin);

--      o_sum   <= i_term1 xor i_term2 xor i_cin;

end main;

-------------------------------------------------------