git.zerfleddert.de Git - raggedstone/blob - dhwk/source/pci/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                         REG_AD <= X"00000000";
  46                         REG_CBEn <= "0000";
  47                         REG_FRAMEn <= '1';
  48                         REG_IRDYn <= '1';
  49                         REG_IDSEL <= '0';
  50                         REG_PAR <= '0';
  51
  52                 elsif (rising_edge(PCI_CLOCK)) then
  53                         REG_AD <= IO_DATA;
  54                         REG_CBEn <= PCI_CBEn;
  55                         REG_FRAMEn <= PCI_FRAMEn;
  56                         REG_IRDYn <= PCI_IRDYn;
  57                         REG_IDSEL <= PCI_IDSEL;
  58                         REG_PAR <= PCI_PAR;
  59                 end if;
  60         end process;
  61
  62         PCI_AD <= REG_AD when OE_PCI_AD ='1' else (others => 'Z');
  63
  64         AD_REG <= REG_AD;
  65         CBE_REGn <= REG_CBEn;
  66         FRAME_REGn <= REG_FRAMEn;
  67         IRDY_REGn <= REG_IRDYn;
  68         IDSEL_REG <= REG_IDSEL;
  69         PAR_REG <= REG_PAR;
  70
  71 end architecture IO_REG_DESIGN;