git.zerfleddert.de Git - raggedstone/blob - dhwk/source/config_04h.vhd

   1 -- J.STELZNER
   2 -- INFORMATIK-3 LABOR
   3 -- 23.08.2006
   4 -- File: CONFIG_04H.VHD
   5
   6 library IEEE;
   7 use IEEE.std_logic_1164.all;
   8
   9 entity CONFIG_04H is
  10         port
  11         (
  12         PCI_CLOCK                       :in             std_logic;
  13         PCI_RSTn                        :in             std_logic;
  14         SERR                                    :in             std_logic;
  15         PERR                                    :in             std_logic;
  16         AD_REG                          :in             std_logic_vector(31 downto 0);
  17         CBE_REGn                        :in             std_logic_vector( 3 downto 0);
  18         CONF_WR_04H             :in             std_logic;
  19         CONF_DATA_04H   :out    std_logic_vector(31 downto 0)
  20         );
  21 end entity CONFIG_04H;
  22
  23 architecture CONFIG_04H_DESIGN of CONFIG_04H is
  24
  25         signal          CONF_STATUS             :std_logic_vector(31 downto 16);
  26         signal          CONF_COMMAND    :std_logic_vector(15 downto  0);
  27
  28
  29 begin
  30
  31 --*******************************************************************
  32 --************* PCI Configuration Space Header "STATUS" *************
  33 --*******************************************************************
  34
  35         CONF_STATUS(20 downto 16)       <= "00000"      ;-- Reserved
  36         CONF_STATUS(21          )       <= '0'                  ;-- MAS/TAR: "R_O" :'0'= 33MHz / '1'= 66MHz
  37         CONF_STATUS(22                                  )       <= '0'                  ;-- MAS/TAR: "R_O"
  38         CONF_STATUS(23          )       <= '0'                  ;-- ???/???: "R_O" : fast back-to-back
  39         CONF_STATUS(24          )       <= '0'                  ;-- Master :
  40 --CONF_STATUS(26 downto 25)     <= "00"                 ;-- Mas/Tar: "R_O" : timing fast   for "DEVSEL"
  41         CONF_STATUS(26 downto 25)       <= "01"                 ;-- Mas/Tar: "R_O" : timing medium for "DEVSEL"
  42 --CONF_STATUS(26 downto 25)     <= "10"                 ;-- Mas/Tar: "R_O" : timing slow   for "DEVSEL"
  43 --CONF_STATUS(26 downto 25)     <= "11"                 ;-- Mas/Tar: "R_O" : reserved
  44         CONF_STATUS(27          )       <= '0'                  ;-- Target : "R_W" : Taget-Abort
  45         CONF_STATUS(28                                  )       <= '0'                  ;-- Master : "R_W" : Taget-Abort
  46         CONF_STATUS(29          )       <= '0'                  ;-- Master : "R_W" : Master-Abort
  47 --CONF_STATUS(30                                        )       <= SERR                 ;-- Mas/Tar: "R_W" : SERR
  48 --CONF_STATUS(31                                        )       <= PERR                 ;-- Mas/Tar: "R_W" : PERR
  49
  50         process (PCI_CLOCK,PCI_RSTn)
  51         begin
  52                 if PCI_RSTn = '0' then  CONF_STATUS(30) <= '0';
  53                                                                                                                 CONF_STATUS(31) <= '0';
  54
  55                 elsif (PCI_CLOCK'event and PCI_CLOCK = '1') then
  56
  57                         if                      CONF_WR_04H     = '1' and CBE_REGn(3) = '0' then
  58
  59                                                         CONF_STATUS(30) <= not (AD_REG(30) and CONF_STATUS(30));
  60                                                         CONF_STATUS(31) <= not (AD_REG(31) and CONF_STATUS(31));
  61
  62                                 else    CONF_STATUS(30) <= SERR or CONF_STATUS(30);
  63                                                         CONF_STATUS(31) <= PERR or CONF_STATUS(31);
  64
  65                         end if;
  66                 end if;
  67         end process;
  68
  69 --*******************************************************************
  70 --*********** PCI Configuration Space Header "COMMAND" **************
  71 --*******************************************************************
  72
  73 --      CONF_COMMAND( 0) <= '0';-- I/O Space accesses ???
  74 --      CONF_COMMAND( 1) <= '0';-- Mem Space accesses ???
  75 --      CONF_COMMAND( 2) <= '0';-- abillity to act as a master on the PCI bus
  76 --      CONF_COMMAND( 3) <= '0';-- Special Cycle ???
  77 --      CONF_COMMAND( 4) <= '0';-- Master ???
  78 --      CONF_COMMAND( 5) <= '0';-- VGA    ???
  79 --      CONF_COMMAND( 6) <= '0';-- Party checking enable/disable
  80                 CONF_COMMAND( 7) <= '0';-- address/data stepping ???
  81 --      CONF_COMMAND( 8) <= '0';-- enable/disable "PCI_SERRn"
  82 --      CONF_COMMAND( 9) <= '0';-- fast back-to-back
  83 --      CONF_COMMAND(10) <= '0';-- Reserved
  84 --      CONF_COMMAND(11) <= '0';-- Reserved
  85 --      CONF_COMMAND(12) <= '0';-- Reserved
  86 --      CONF_COMMAND(13) <= '0';-- Reserved
  87 --      CONF_COMMAND(14) <= '0';-- Reserved
  88 --      CONF_COMMAND(15) <= '0';-- Reserved
  89
  90         process (PCI_CLOCK,PCI_RSTn)
  91         begin
  92                 if PCI_RSTn = '0' then  CONF_COMMAND(15 downto 8) <= (others =>'0');
  93                                                                                                                 CONF_COMMAND( 6 downto 0) <= (others =>'0');
  94
  95                 elsif (PCI_CLOCK'event and PCI_CLOCK = '1') then
  96
  97                         if              CONF_WR_04H      = '1'and CBE_REGn(1) = '0' then
  98
  99                                                         CONF_COMMAND(15 downto 8)       <=                              AD_REG(15 downto 8);
 100                                 else    CONF_COMMAND(15 downto 8)       <=      CONF_COMMAND(15 downto 8);
 101                         end if;
 102
 103
 104                         if              CONF_WR_04H      = '1'and CBE_REGn(0) = '0' then
 105
 106                                                         CONF_COMMAND( 6 downto 0) <=                            AD_REG( 6 downto 0);
 107                                 else    CONF_COMMAND( 6 downto 0) <=    CONF_COMMAND( 6 downto 0);
 108                         end if;
 109
 110                 end if;
 111         end process;
 112
 113         CONF_DATA_04H   <= CONF_STATUS & CONF_COMMAND;
 114
 115 end architecture CONFIG_04H_DESIGN;