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

-- DESCRIPTION   :  Demultiplexer

--                  Width: 8

--                  Number of terminals: 4

--                  Output enable active: HIGH

--                  Output active : HIGH

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

library IEEE;

use IEEE.STD_LOGIC_1164.all;

use IEEE.STD_LOGIC_UNSIGNED.all;

entity dmux is

          port (

                    EN : in STD_LOGIC;

                    DATA_OUT0 : out STD_LOGIC_VECTOR (7 downto 0);

                    DATA_OUT1 : out STD_LOGIC_VECTOR (7 downto 0);

                    DATA_OUT2 : out STD_LOGIC_VECTOR (7 downto 0);

                    DATA_OUT3 : out STD_LOGIC_VECTOR (7 downto 0);

                    SEL : in STD_LOGIC_VECTOR (1 downto 0);

                    DATA_IN : in STD_LOGIC_VECTOR (7 downto 0)

          );

end entity;

architecture dmux_arch of dmux is

constant NON_ACTIVE : STD_LOGIC_VECTOR (7 downto 0) := (others => '0');

begin

          DATA_OUT0 <= DATA_IN when (SEL = 0) and (EN = '1') else NON_ACTIVE;

          DATA_OUT1 <= DATA_IN when (SEL = 1) and (EN = '1') else NON_ACTIVE;

          DATA_OUT2 <= DATA_IN when (SEL = 2) and (EN = '1') else NON_ACTIVE;

          DATA_OUT3 <= DATA_IN when (SEL = 3) and (EN = '1') else NON_ACTIVE;

end architecture;