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

   1 -- J.STELZNER
   2 -- INFORMATIK-3 LABOR
   3 -- 23.08.2006
   4 -- File: CONT_FSM.VHD
   5
   6 library ieee;
   7 use ieee.std_logic_1164.all;
   8
   9 entity CONT_FSM is
  10         port
  11         (
  12                 PCI_CLOCK :in std_logic;
  13                 PCI_RSTn :in std_logic;
  14                 IO_READ :in std_logic;
  15                 IO_WRITE :in std_logic;
  16                 CONF_READ :in std_logic;
  17                 CONF_WRITE :in std_logic;
  18                 FIFO_READ :in std_logic;
  19                 READ :out std_logic;--> MUX_SEL(1) , OE_PCI_AD
  20                 PERR_CHECK :out std_logic;
  21                 DEVSELn :out std_logic;
  22                 OE_PCI_PAR :out std_logic;
  23                 OE_PCI_PERR :out std_logic;
  24                 TRDYn :out std_logic;
  25                 PCI_TRDYn :out std_logic; -- s/t/s
  26                 PCI_STOPn :out std_logic; -- s/t/s
  27                 PCI_DEVSELn :out std_logic; -- s/t/s
  28                 FIFO_RDn :out std_logic
  29         );
  30 end entity CONT_FSM;
  31
  32 architecture CONT_FSM_DESIGN of CONT_FSM is
  33
  34
  35
  36  --**********************************************************
  37  --*** CONTROL FSM CODIERUNG ***
  38  --**********************************************************
  39  --
  40  --
  41  --
  42  -- |----------- HELP
  43  -- ||---------- FIFO_READn
  44  -- |||--------- OE_PCI_PERR
  45  -- ||||-------- PERR_CHECK
  46  -- |||||------- TRDYn
  47  -- ||||||------ STOPn
  48  -- |||||||----- DEVSELn
  49  -- ||||||||---- OE_PCI_PAR
  50  -- |||||||||--- OE_CONTROL
  51  -- ||||||||||-- READ / MUX_SEL(1) / OE_PCI_AD
  52  -- ||||||||||
  53         constant ST_IDLE :std_logic_vector (9 downto 0) := "0100111000";-- 138
  54
  55         constant ST_READ_1 :std_logic_vector (9 downto 0) := "0100110011";-- 133
  56         constant ST_READ_2 :std_logic_vector (9 downto 0) := "0100000111";-- 107
  57         constant ST_READ_3 :std_logic_vector (9 downto 0) := "0100111111";-- 13F
  58
  59         constant ST_RD_FIFO_1 :std_logic_vector (9 downto 0) := "0000110011";-- 033
  60         constant ST_RD_FIFO_2 :std_logic_vector (9 downto 0) := "1100110011";-- 233
  61
  62
  63         constant ST_WRITE_1 :std_logic_vector (9 downto 0) := "0111110010";-- 1F2
  64         constant ST_WRITE_2 :std_logic_vector (9 downto 0) := "0110000010";-- 182
  65         constant ST_WRITE_3 :std_logic_vector (9 downto 0) := "0110111010";-- 1BA
  66
  67         signal CONTROL_STATE :std_logic_vector (9 downto 0);
  68
  69
  70  --signal DEVSELn :std_logic;
  71         signal STOPn :std_logic;
  72  --signal TRDYn :std_logic;
  73
  74  --************************************************************
  75  --*** FSM SPEICHER-AUTOMAT ***
  76  --************************************************************
  77
  78         attribute syn_state_machine : boolean;
  79         attribute syn_state_machine of CONTROL_STATE : signal is false;
  80
  81 begin
  82
  83  --**********************************************************
  84  --*** CONTROL FSM ***
  85  --**********************************************************
  86
  87         process (PCI_CLOCK, PCI_RSTn)
  88         begin
  89                 if PCI_RSTn = '0' then CONTROL_STATE <= ST_IDLE;
  90
  91         elsif (rising_edge(PCI_CLOCK)) then
  92
  93                 case CONTROL_STATE is
  94                 when ST_IDLE =>
  95                         if IO_READ = '1' then
  96                                 CONTROL_STATE <= ST_READ_1;
  97
  98                         elsif CONF_READ = '1' then
  99                                 CONTROL_STATE <= ST_READ_1;
 100
 101                         elsif IO_WRITE = '1' then
 102                                 CONTROL_STATE <= ST_WRITE_1;
 103
 104                         elsif CONF_WRITE = '1' then
 105                                 CONTROL_STATE <= ST_WRITE_1;
 106
 107                         else CONTROL_STATE <= ST_IDLE;
 108                         end if;
 109
 110                 -- when ST_READ_1 =>
 111                 -- CONTROL_STATE <= ST_READ_2;
 112
 113                 when ST_READ_1 =>
 114                         if FIFO_READ = '1' then
 115                                 CONTROL_STATE <= ST_RD_FIFO_1;
 116                         else
 117                                 CONTROL_STATE <= ST_READ_2;
 118                         end if;
 119
 120                 when ST_READ_2 =>
 121                         CONTROL_STATE <= ST_READ_3;
 122
 123                 when ST_READ_3 =>
 124                         CONTROL_STATE <= ST_IDLE;
 125
 126                 when ST_RD_FIFO_1=>
 127                         CONTROL_STATE <= ST_RD_FIFO_2;
 128
 129                 when ST_RD_FIFO_2=>
 130                         CONTROL_STATE <= ST_READ_2;
 131
 132                 when ST_WRITE_1 =>
 133                         CONTROL_STATE <= ST_WRITE_2;
 134
 135                 when ST_WRITE_2 =>
 136                         CONTROL_STATE <= ST_WRITE_3;
 137
 138                 when ST_WRITE_3 =>
 139                         CONTROL_STATE <= ST_IDLE;
 140
 141                 when others =>
 142                         CONTROL_STATE <= ST_IDLE;
 143
 144                 end case; -- COMM_STATE
 145         end if; -- CLOCK
 146 end process; -- PROCESS
 147
 148
 149 READ <= CONTROL_STATE(0);
 150 --OE_CONTROL <= CONTROL_STATE(1);
 151 OE_PCI_PAR <= CONTROL_STATE(2);
 152 DEVSELn <= CONTROL_STATE(3);
 153 STOPn <= CONTROL_STATE(4);
 154 TRDYn <= CONTROL_STATE(5);
 155 PERR_CHECK <= CONTROL_STATE(6);
 156 OE_PCI_PERR <= CONTROL_STATE(7);
 157
 158 FIFO_RDn <= CONTROL_STATE(8);
 159
 160
 161 PCI_DEVSELn <= CONTROL_STATE(3) when CONTROL_STATE(1) = '1' else 'Z';
 162 PCI_STOPn <= STOPn when CONTROL_STATE(1) = '1' else 'Z';
 163 PCI_TRDYn <= CONTROL_STATE(5) when CONTROL_STATE(1) = '1' else 'Z';
 164
 165 end architecture CONT_FSM_DESIGN;