------------------------------------------------------------------------------------
-- DESCRIPTION : Demultiplexer
-- Width: 8
-- Number of terminals: 4
-- Output enable active: HIGH
-- Output active : HIGH
------------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOG_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;