git.zerfleddert.de Git - raggedstone/blob - dhwk/source/config_rd_0.vhd

   1 -- J.STELZNER
   2 -- INFORMATIK-3 LABOR
   3 -- 23.08.2006
   4 -- File: CONFIG_RD_0.VHD
   5
   6 library IEEE;
   7 use IEEE.std_logic_1164.all;
   8
   9 entity CONFIG_RD_0 is
  10     port
  11         (
  12         ADDR_REG        :in             std_logic_vector (31 downto 0);
  13         CF_RD_COM       :in             std_logic;
  14         READ_SEL        :out    std_logic_vector ( 2 downto 0)
  15     );
  16 end entity CONFIG_RD_0;
  17
  18 architecture CONFIG_RD_0_DESIGN of CONFIG_RD_0 is
  19
  20 --
  21 --
  22 --
  23 --
  24 --
  25 --                             PCI Configuration Space Header
  26 --
  27 --            \                        Bit
  28 --                         \
  29 --Address               |31               24|23           16|15            8|7             0|
  30 -----------------------------------------------------------------
  31 --00                    |Device ID                              |Vendor ID                              |
  32 --04                    |Status                                 |Command                                |
  33 --08                    |Class Code                                                     |Revision ID|
  34 --0C                    |BIST           |Header Type|Latency T. |Cache L.S.     |
  35 --10-24                 |Base Address Register                                                  |
  36 --28                    |Cardbus CIS Pointer                                                    |
  37 --2C                    |Subsystem ID                   |Subsystem Vendor ID    |
  38 --30                    |Expansion ROM Base Address                                             |
  39 --34                    |Reserved                                                                               |
  40 --38                    |Reserved                                                                               |
  41 --3C                    |Max_Lat        |Min_Gnt        |Int_Pin        |Int_Line       |
  42 --40-FF                 |                                                                                               |
  43 -----------------------------------------------------------------
  44
  45
  46 --PCI Bus Commands
  47 --C/BE[3..0] Command Type
  48 --------------------------------------
  49 --      0000            Interrupt Acknowledge
  50 --      0001            Special Cycle
  51 --      0010            I/O Read
  52 --      0011            I/O Write
  53 --      0100            Reserved
  54 --      0101            Reserved
  55 --      0110            Memory Read
  56 --      0111            Memory Write
  57 --
  58 --      1000            Reserved
  59 --      1001            Reserved
  60 --      1010            Configuration Read
  61 --      1011            Configuration Write
  62 --      1100            Memory Read Multiple
  63 --      1101            Dual Address Cycle
  64 --      1110            Memory Read Line
  65 --      1111            Memory Write and Invalidate
  66
  67
  68 --PCI Byte Enable
  69 --C/BE[3..0] gueltige Datenbits
  70 -------------------------------
  71 --      0000            AD 31..0
  72 --      1000            AD 23..0
  73 --      1100            AD 15..0
  74 --      1110            AD  7..0
  75
  76         constant        CMD_INT_ACK                     :std_logic_vector(3 downto 0) := "0000";
  77         constant        CMD_SP_CYC                      :std_logic_vector(3 downto 0) := "0001";
  78         constant        CMD_IO_READ                     :std_logic_vector(3 downto 0) := "0010";
  79         constant        CMD_IO_WRITE            :std_logic_vector(3 downto 0) := "0011";
  80         constant        CMD_RES_4                               :std_logic_vector(3 downto 0) := "0100";
  81         constant        CMD_RES_5                               :std_logic_vector(3 downto 0) := "0101";
  82         constant        CMD_MEM_READ            :std_logic_vector(3 downto 0) := "0110";
  83         constant        CMD_MEM_WRITE           :std_logic_vector(3 downto 0) := "0111";
  84         constant        CMD_RES_8                               :std_logic_vector(3 downto 0) := "1000";
  85         constant        CMD_RES_9                               :std_logic_vector(3 downto 0) := "1001";
  86         constant        CMD_CONF_READ           :std_logic_vector(3 downto 0) := "1010";
  87         constant        CMD_CONF_WRITE  :std_logic_vector(3 downto 0) := "1011";
  88         constant        CMD_MEM_READ_M  :std_logic_vector(3 downto 0) := "1100";
  89         constant        CMD_DU_ADR_CYC  :std_logic_vector(3 downto 0) := "1101";
  90         constant        CMD_MEN_READ_L  :std_logic_vector(3 downto 0) := "1110";
  91         constant        CMD_MEM_WRITE_I :std_logic_vector(3 downto 0) := "1111";
  92
  93         signal          MUX                                                     :std_logic_vector(31 downto 0);
  94         signal          CONFIG_ADDR                     :std_logic_vector( 7 downto 0);
  95
  96 begin
  97
  98         CONFIG_ADDR(7 downto 0) <= ADDR_REG(7 downto 0);
  99
 100 --*******************************************************************
 101 --*********************** PCI Read Address **************************
 102 --*******************************************************************
 103
 104         process (CF_RD_COM, CONFIG_ADDR)
 105         begin
 106
 107                 if      CF_RD_COM = '1' then
 108
 109                         if              CONFIG_ADDR = X"00"     then    READ_SEL <= "000";
 110                         elsif   CONFIG_ADDR = X"04"     then    READ_SEL <= "001";
 111                         elsif   CONFIG_ADDR = X"08"     then    READ_SEL <= "010";
 112                         elsif   CONFIG_ADDR = X"10"     then    READ_SEL <= "011";
 113                         elsif   CONFIG_ADDR = X"3C"     then    READ_SEL <= "100";
 114                         elsif   CONFIG_ADDR = X"40"     then    READ_SEL <= "101";
 115                         else                                                            READ_SEL <= "111";
 116                         end if;
 117                 else                                                                    READ_SEL <= "111";
 118                 end if;
 119         end process;
 120
 121 end architecture CONFIG_RD_0_DESIGN;
 122