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-- TITLE: Bus Multiplexer / Signal Router

-- TITLE: Bus Multiplexer / Signal Router

-- AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

-- AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

-- DATE CREATED: 2/8/01

-- DATE CREATED: 2/8/01

-- FILENAME: bus_mux.vhd

-- FILENAME: bus_mux.vhd

-- COPYRIGHT: Software placed into the public domain by the author.

-- COPYRIGHT: Software placed into the public domain by the author.

--    Software 'as is' without warranty.  Author liable for nothing.

--    Software 'as is' without warranty.  Author liable for nothing.

-- DESCRIPTION:

-- DESCRIPTION:

--    This entity is the main signal router.  

--    This entity is the main signal router.  

--    It multiplexes signals from multiple sources to the correct location.

--    It multiplexes signals from multiple sources to the correct location.

--       reg_dest_out : goes to the register bank

--       reg_dest_out : goes to the register bank

--       take_branch  : a signal to pc_next

--       take_branch  : a signal to pc_next

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library ieee;

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_1164.all;

entity bus_mux is

entity bus_mux is

   port(imm_in       : in  std_logic_vector(15 downto 0);

   port(imm_in       : in  std_logic_vector(15 downto 0);

        reg_source   : in  std_logic_vector(31 downto 0);

        reg_source   : in  std_logic_vector(31 downto 0);

        a_mux        : in  a_source_type;

        a_mux        : in  a_source_type;