git.zerfleddert.de Git - raggedstone/blob - dhwk/source/DATA_MUX.vhd

   1 -- J.STELZNER
   2 -- INFORMATIK-3 LABOR
   3 -- 23.08.2006
   4 -- File: DATA_MUX.VHD
   5
   6 library ieee ;
   7 use ieee.std_logic_1164.all ;
   8
   9 entity DATA_MUX is
  10         port
  11         (
  12         READ_SEL                :in             std_logic_vector( 1 downto 0);
  13         ADDR_REG                :in             std_logic_vector(31 downto 0);
  14         CBE_REGn                :in             std_logic_vector( 3 downto 0);
  15         MUX_IN_XX0      :in             std_logic_vector( 7 downto 0);
  16         MUX_IN_XX1      :in             std_logic_vector( 7 downto 0);
  17         MUX_IN_XX2      :in             std_logic_vector( 7 downto 0);
  18         MUX_IN_XX3      :in             std_logic_vector( 7 downto 0);
  19         MUX_IN_XX4      :in             std_logic_vector( 7 downto 0);
  20         MUX_IN_XX5      :in             std_logic_vector( 7 downto 0);
  21         MUX_IN_XX6      :in             std_logic_vector( 7 downto 0);
  22         MUX_IN_XX7      :in             std_logic_vector( 7 downto 0);
  23         MUX_OUT                 :out    std_logic_vector(31 downto 0);
  24         READ_XX1_0      :out    std_logic;
  25         READ_XX3_2      :out    std_logic;
  26         READ_XX5_4      :out    std_logic;
  27         READ_XX7_6      :out    std_logic
  28 --READ_FIFO             :out    std_logic
  29         );
  30 end entity DATA_MUX ;
  31
  32 architecture DATA_MUX_DESIGN of DATA_MUX is
  33
  34         signal  MUX     :std_logic_vector(31 downto 0);
  35         signal  SEL     :std_logic_vector( 7 downto 0);
  36
  37         signal  SIG_READ_XX1_0  :std_logic;
  38         signal  SIG_READ_XX3_2  :std_logic;
  39         signal  SIG_READ_XX5_4  :std_logic;
  40         signal  SIG_READ_XX7_6  :std_logic;
  41
  42 begin
  43
  44         SEL     <= ADDR_REG(3 downto 2) & CBE_REGn      &       READ_SEL ;
  45
  46         SIG_READ_XX1_0  <=      '1' when        SEL     =       "00110011"      else    '0';
  47         SIG_READ_XX3_2  <=      '1' when        SEL     =       "00001111"      else    '0';
  48         SIG_READ_XX5_4  <=      '1' when        SEL     =       "01110011"      else    '0';
  49         SIG_READ_XX7_6  <=      '1' when        SEL     =       "01001111"      else    '0';
  50
  51
  52
  53         MUX     <=      (X"00"                  & X"00"                         & MUX_IN_XX1    &       MUX_IN_XX0)     when    SIG_READ_XX1_0  =       '1' else
  54                                         (MUX_IN_XX3     &       MUX_IN_XX2  &   X"00"                           & X"00"                 )       when    SIG_READ_XX3_2  =       '1' else
  55                                         (X"00"                  & X"00"                         & MUX_IN_XX5    &       MUX_IN_XX4)     when    SIG_READ_XX5_4  =       '1' else
  56                                         (MUX_IN_XX7     &       MUX_IN_XX6  &   X"00"                           & X"00"                 )       when    SIG_READ_XX7_6  =       '1' else
  57                                         (others => '0');
  58
  59
  60 --      MUX     <=      (X"01"                  & X"23"                         & MUX_IN_XX1    &       MUX_IN_XX0)     when    SIG_READ_XX1_0  =       '1' else
  61 --                                      (MUX_IN_XX3     &       MUX_IN_XX2  &   X"45"                           & X"67"                 )       when    SIG_READ_XX3_2  =       '1' else
  62 --                                      (X"89"                  & X"AB"                         & MUX_IN_XX5    &       MUX_IN_XX4)     when    SIG_READ_XX5_4  =       '1' else
  63 --                                      (MUX_IN_XX7     &       MUX_IN_XX6  &   X"CD"                           & X"EF"                 )       when    SIG_READ_XX7_6  =       '1' else
  64 --                                      (others => '0');
  65
  66
  67         MUX_OUT <= MUX ;
  68
  69
  70         READ_XX1_0      <=      SIG_READ_XX1_0;
  71         READ_XX3_2      <=      SIG_READ_XX3_2;
  72         READ_XX5_4      <=      SIG_READ_XX5_4;
  73         READ_XX7_6      <=      SIG_READ_XX7_6;
  74
  75 --READ_FIFO             <=      SIG_READ_XX3_2 or SIG_READ_XX5_4;--SIG_READ_XX5_4 nur fuer test
  76
  77 end architecture DATA_MUX_DESIGN ;