git.zerfleddert.de Git - raggedstone/blob - dhwk/source/pci/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                         if CONFIG_ADDR = X"00" then
 109                                 READ_SEL <= "000";
 110
 111                         elsif CONFIG_ADDR = X"04" then
 112                                 READ_SEL <= "001";
 113
 114                         elsif CONFIG_ADDR = X"08" then
 115                                 READ_SEL <= "010";
 116
 117                         elsif CONFIG_ADDR = X"10" then
 118                                 READ_SEL <= "011";
 119
 120                         elsif CONFIG_ADDR = X"3C" then
 121                                 READ_SEL <= "100";
 122
 123                         elsif CONFIG_ADDR = X"40" then
 124                                 READ_SEL <= "101";
 125
 126                         else
 127                                 READ_SEL <= "111";
 128                         end if;
 129                 else
 130                         READ_SEL <= "111";
 131                 end if;
 132         end process;
 133
 134 end architecture CONFIG_RD_0_DESIGN;