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-- TITLE: Arithmetic Logic Unit

-- TITLE: Arithmetic Logic Unit

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

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

-- DATE CREATED: 2/8/01

-- DATE CREATED: 2/8/01

-- FILENAME: alu.vhd

-- FILENAME: alu.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:

--    Implements the ALU.

--    Implements the ALU.

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library ieee;

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_1164.all;

entity alu is

entity alu is

   port(a_in         : in  std_logic_vector(31 downto 0);

   port(a_in         : in  std_logic_vector(31 downto 0);

        b_in         : in  std_logic_vector(31 downto 0);

        b_in         : in  std_logic_vector(31 downto 0);

        alu_function : in  alu_function_type;

        alu_function : in  alu_function_type;