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

   1 -- J.STELZNER
   2 -- INFORMATIK-3 LABOR
   3 -- 23.08.2006
   4 -- File: IO_MUX.VHD
   5
   6 library ieee;
   7 use ieee.std_logic_1164.all;
   8
   9 entity IO_REG is
  10     port
  11         (
  12         PCI_CLOCK               :in             std_logic;
  13         PCI_RSTn                :in             std_logic;
  14         PCI_FRAMEn      :in             std_logic;
  15         PCI_IRDYn               :in             std_logic;
  16         PCI_IDSEL               :in             std_logic;
  17         PCI_PAR                 :in             std_logic;
  18         PCI_CBEn                :in             std_logic_vector ( 3 downto 0);
  19         OE_PCI_AD               :in             std_logic;
  20         IO_DATA                 :in             std_logic_vector (31 downto 0);
  21         AD_REG                  :out    std_logic_vector (31 downto 0);
  22         CBE_REGn                :out    std_logic_vector ( 3 downto 0);
  23         FRAME_REGn      :out    std_logic;
  24         IRDY_REGn               :out    std_logic;
  25         IDSEL_REG               :out    std_logic;
  26         PAR_REG                 :out    std_logic;
  27         PCI_AD                  :out    std_logic_vector (31 downto 0)  --      t/s
  28     );
  29 end entity IO_REG;
  30
  31 architecture IO_REG_DESIGN of IO_REG is
  32
  33         signal  REG_AD                  :std_logic_vector (31 downto 0);
  34         signal  REG_CBEn                :std_logic_vector ( 3 downto 0);
  35         signal  REG_FRAMEn      :std_logic;
  36         signal  REG_IRDYn               :std_logic;
  37         signal  REG_IDSEL               :std_logic;
  38         signal  REG_PAR                 :std_logic;
  39
  40 begin
  41
  42         process (PCI_CLOCK, PCI_RSTn)
  43         begin
  44                 if      PCI_RSTn = '0'  then
  45
  46                         REG_AD                  <= X"00000000";
  47                         REG_CBEn                <= "0000";
  48                         REG_FRAMEn      <= '1';
  49                         REG_IRDYn               <= '1';
  50                         REG_IDSEL               <= '0';
  51                         REG_PAR                 <= '0';
  52
  53                 elsif (PCI_CLOCK'event and PCI_CLOCK = '1') then
  54
  55                         REG_AD                  <=      IO_DATA;
  56                         REG_CBEn                <=      PCI_CBEn;
  57                         REG_FRAMEn      <=      PCI_FRAMEn;
  58                         REG_IRDYn               <=      PCI_IRDYn;
  59                         REG_IDSEL               <=      PCI_IDSEL;
  60                         REG_PAR                 <=      PCI_PAR;
  61
  62                 end if;
  63         end process;
  64
  65         PCI_AD                  <=      REG_AD when OE_PCI_AD ='1' else (others => 'Z');
  66
  67         AD_REG                  <=      REG_AD;
  68         CBE_REGn                <=      REG_CBEn;
  69         FRAME_REGn      <=      REG_FRAMEn;
  70         IRDY_REGn               <=      REG_IRDYn;
  71         IDSEL_REG               <=      REG_IDSEL;
  72         PAR_REG                 <=      REG_PAR;
  73
  74 end architecture IO_REG_DESIGN;