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[raggedstone] / dhwk / source / pci / data_mux.vhd

-- J.STELZNER
-- INFORMATIK-3 LABOR
-- 23.08.2006
-- File: DATA_MUX.VHD

library ieee;
use ieee.std_logic_1164.all;

entity DATA_MUX is
        port
        (
                READ_SEL :in std_logic_vector( 1 downto 0);
                ADDR_REG :in std_logic_vector(31 downto 0);
                CBE_REGn :in std_logic_vector( 3 downto 0);
                MUX_IN_XX0 :in std_logic_vector( 7 downto 0);
                MUX_IN_XX1 :in std_logic_vector( 7 downto 0);
                MUX_IN_XX2 :in std_logic_vector( 7 downto 0);
                MUX_IN_XX3 :in std_logic_vector( 7 downto 0);
                MUX_IN_XX4 :in std_logic_vector( 7 downto 0);
                MUX_IN_XX5 :in std_logic_vector( 7 downto 0);
                MUX_IN_XX6 :in std_logic_vector( 7 downto 0);
                MUX_IN_XX7 :in std_logic_vector( 7 downto 0);
                MUX_OUT :out std_logic_vector(31 downto 0);
                READ_XX1_0 :out std_logic;
                READ_XX3_2 :out std_logic;
                READ_XX5_4 :out std_logic;
                READ_XX7_6 :out std_logic
                --READ_FIFO :out std_logic
        );
end entity DATA_MUX;

architecture DATA_MUX_DESIGN of DATA_MUX is

        signal MUX :std_logic_vector(31 downto 0);
        signal SEL :std_logic_vector( 7 downto 0);

        signal SIG_READ_XX1_0 :std_logic;
        signal SIG_READ_XX3_2 :std_logic;
        signal SIG_READ_XX5_4 :std_logic;
        signal SIG_READ_XX7_6 :std_logic;

begin

        SEL <= ADDR_REG(3 downto 2) & CBE_REGn & READ_SEL;

        SIG_READ_XX1_0 <= '1' when SEL = "00110011" else '0';
        SIG_READ_XX3_2 <= '1' when SEL = "00001111" else '0';
        SIG_READ_XX5_4 <= '1' when SEL = "01110011" else '0';
        SIG_READ_XX7_6 <= '1' when SEL = "01001111" else '0';

        MUX <= (X"00" & X"00" & MUX_IN_XX1 & MUX_IN_XX0) when SIG_READ_XX1_0 = '1' else
               (MUX_IN_XX3 & MUX_IN_XX2 & X"00" & X"00" ) when SIG_READ_XX3_2 = '1' else
               (X"00" & X"00" & MUX_IN_XX5 & MUX_IN_XX4) when SIG_READ_XX5_4 = '1' else
               (MUX_IN_XX7 & MUX_IN_XX6 & X"00" & X"00" ) when SIG_READ_XX7_6 = '1' else
               (others => '0');


 -- MUX <= (X"01" & X"23" & MUX_IN_XX1 & MUX_IN_XX0) when SIG_READ_XX1_0 = '1' else
 -- (MUX_IN_XX3 & MUX_IN_XX2 & X"45" & X"67" ) when SIG_READ_XX3_2 = '1' else
 -- (X"89" & X"AB" & MUX_IN_XX5 & MUX_IN_XX4) when SIG_READ_XX5_4 = '1' else
 -- (MUX_IN_XX7 & MUX_IN_XX6 & X"CD" & X"EF" ) when SIG_READ_XX7_6 = '1' else
 -- (others => '0');


        MUX_OUT <= MUX;


        READ_XX1_0 <= SIG_READ_XX1_0;
        READ_XX3_2 <= SIG_READ_XX3_2;
        READ_XX5_4 <= SIG_READ_XX5_4;
        READ_XX7_6 <= SIG_READ_XX7_6;

--READ_FIFO <= SIG_READ_XX3_2 or SIG_READ_XX5_4;--SIG_READ_XX5_4 nur fuer test

end architecture DATA_MUX_DESIGN;