demux_1_to_16.vhd

simple MIPS source code very simple it has not complete but you can test it

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-- Company: 
-- Engineer: 
-- 
-- Create Date:    12:34:11 04/02/2009 
-- Design Name: 
-- Module Name:    demux_1_to_16 - Behavioral 
-- Project Name: 
-- Target Devices: 
-- Tool versions: 
-- Description: 
--
-- Dependencies: 
--
-- Revision: 
-- Revision 0.01 - File Created
-- Additional Comments: 
--
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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity demux_1_to_16 is
port(
	we 			: in std_logic;
	sel			: in std_logic_vector(4 downto 0);
	data_en00	: out std_logic;
	data_en01	: out std_logic;
	data_en02	: out std_logic;
	data_en03	: out std_logic;
	data_en04	: out std_logic;
	data_en05	: out std_logic;
	data_en06	: out std_logic;
	data_en07	: out std_logic;
	data_en08	: out std_logic;
	data_en09	: out std_logic;
	data_en10	: out std_logic;
	data_en11	: out std_logic;
	data_en12	: out std_logic;
	data_en13	: out std_logic;
	data_en14	: out std_logic;
	data_en15	: out std_logic
);
end demux_1_to_16;

architecture Behavioral of demux_1_to_16 is

begin
process(sel, we)
begin
		case sel is
			when "00000" 	=> data_en00 <= we; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "00001" 	=> data_en01 <= we; data_en00 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "00010" 	=> data_en02 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "00011" 	=> data_en03 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "00100" 	=> data_en04 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "00101" 	=> data_en05 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "00110" 	=> data_en06 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "00111" 	=> data_en07 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "01000" 	=> data_en08 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "01001" 	=> data_en09 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "01010" 	=> data_en10 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "01011" 	=> data_en11 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "01100" 	=> data_en12 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en13 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "01101" 	=> data_en13 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en14 <= '0'; data_en15 <= '0';
			when "01110" 	=> data_en14 <= we; data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en15 <= '0';
			when others => data_en15 <= we;    data_en00 <= '0'; data_en01 <= '0'; data_en02 <= '0'; data_en03 <= '0'; data_en04 <= '0'; data_en05 <= '0'; data_en06 <= '0'; data_en07 <= '0'; data_en08 <= '0'; data_en09 <= '0'; data_en10 <= '0'; data_en11 <= '0'; data_en12 <= '0'; data_en13 <= '0'; data_en14 <= '0';
		end case;
	end process;
end Behavioral;