-- +-----------------------------+
-- |    Library:  multiplexer    |
-- |    designer : Tim Pagden    |
-- |     opened:  7 Jul 1998     |
-- |     edit by JK 19/05/08     |
-- +-----------------------------+

-- Function: N-bit demultiplexer

library ieee;
  use ieee.std_logic_1164.all;
  use ieee.numeric_std.all;

entity demux_generic is
generic (
  in_width : integer := 1
);
port (
  a      : in  std_logic_vector(in_width-1 downto 0);
  enable : in  std_logic;
  y      : out std_logic_vector((2 ** in_width)-1 downto 0)
);
end demux_generic;

architecture behaviour of demux_generic is

begin

  demux_a_to_y: process (a, enable)
  begin
    y <= (others => '0');
    if enable = '1' then
      y(to_integer(unsigned(a))) <= '1';
    end if;
  end process;

end behaviour;