Subversion Repositories mips_fault_tolerant

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-- Company: 

-- Engineer: 

-- 

-- Create Date:    19:02:24 06/24/2012 

-- Design Name: 

-- Module Name:    RF_mux - 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;

-- Uncomment the following library declaration if using

-- arithmetic functions with Signed or Unsigned values

--use IEEE.NUMERIC_STD.ALL;

-- Uncomment the following library declaration if instantiating

-- any Xilinx primitives in this code.

--library UNISIM;

--use UNISIM.VComponents.all;

entity RF_mux is

port (

      clk   : in std_logic;

                RFmux : in std_logic_vector(2 downto 0);

      Hi_in : in std_logic_vector(31 downto 0);

      Lo_in : in std_logic_vector(31 downto 0);

      Alu_in: in std_logic_vector(31 downto 0);

      From_N : in std_logic_vector(31 downto 0);

      Mdr_fr_out : in std_logic_vector(31 downto 0);

      RF_out: out std_logic_vector(31 downto 0)

      );

end RF_mux;

architecture Behavioral of RF_mux is

begin

      process(clk,RFmux)

                begin

                if (FALLING_EDGE(clk))then

                case RFmux is

                           when "000" => RF_out <= Hi_in;

                                          when "010" => RF_out <= Lo_in;

                                          when "100" => RF_out <= Alu_in;

                                          when "110" => RF_out <= Mdr_fr_out;

                                          when "001" => RF_out <= From_N;

                           when others => RF_out <= (others => '0');

                end case;

                end if;

      end process;

end Behavioral;