-- +-----------------------------+
-- |    Library:  multiplexer    |
-- |    designer : Tim Pagden    |
-- |     opened:  7 Jul 1998     |
-- +-----------------------------+

-- Function: N-bit M-to-1 multiplexer

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

entity mux_generic is
generic (
  data_width : integer := 1;    -- N-bit data
  funnel_factor : integer := 2  -- M to 1, thus f_f = M
);
port (
  a   : in  std_logic_2D_array(0 to (funnel_factor-1), data_width-1 downto 0);
  sel : in  std_logic_vector;
  y   : out std_logic_vector
);
end mux_generic;

-- behaviour
architecture behaviour of mux_generic is

begin

  mux_a_to_y: process (a, sel)
    -- variable upper, lower : integer;
  begin
    for i in data_width-1 downto 0 loop
      y(i) <= a(to_integer(unsigned(sel)), i);
    end loop;
  end process;

end behaviour;