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

   1 -- J.STELZNER
   2 -- INFORMATIK-3 LABOR
   3 -- 23.08.2006
   4 -- File: FLAG_BUS.VHD
   5
   6 library IEEE;
   7 use IEEE.std_logic_1164.all;
   8
   9 entity FLAG_BUS is
  10         port
  11         (
  12                 PCI_CLOCK :in std_logic;
  13                 KONS_1 :in std_logic;
  14                 FLAG_IN_0 :in std_logic;
  15                 R_EFn :in std_logic;
  16                 R_HFn :in std_logic;
  17                 R_FFn :in std_logic;
  18                 FLAG_IN_4 :in std_logic;
  19                 S_EFn :in std_logic;
  20                 S_HFn :in std_logic;
  21                 S_FFn :in std_logic;
  22                 HOLD :in std_logic;
  23                 SYNC_FLAG :out std_logic_vector (7 downto 0)
  24         );
  25 end entity FLAG_BUS;
  26
  27 architecture FLAG_BUS_DESIGN of FLAG_BUS is
  28
  29
  30         signal FF1_S_EFn :std_logic;
  31         signal FF1_S_HFn :std_logic;
  32         signal FF1_S_FFn :std_logic;
  33         signal FF1_R_EFn :std_logic;
  34         signal FF1_R_HFn :std_logic;
  35         signal FF1_R_FFn :std_logic;
  36
  37         signal FF2_S_EFn :std_logic;
  38         signal FF2_S_HFn :std_logic;
  39         signal FF2_S_FFn :std_logic;
  40         signal FF2_R_EFn :std_logic;
  41         signal FF2_R_HFn :std_logic;
  42         signal FF2_R_FFn :std_logic;
  43
  44 begin
  45
  46
  47         process (PCI_CLOCK)
  48         begin
  49                 if (PCI_CLOCK'event and PCI_CLOCK = '1') then
  50                         FF1_S_EFn <= not S_EFn;
  51                         FF1_S_HFn <= not S_HFn;
  52                         FF1_S_FFn <= not S_FFn;
  53                         FF1_R_EFn <= not R_EFn;
  54                         FF1_R_HFn <= not R_HFn;
  55                         FF1_R_FFn <= not R_FFn;
  56                 end if;
  57         end process;
  58
  59
  60         process (PCI_CLOCK)
  61         begin
  62                 if (PCI_CLOCK'event and PCI_CLOCK = '1') then
  63                         if HOLD = '0' then
  64                                 FF2_S_EFn <= FF1_S_EFn;
  65                                 FF2_S_HFn <= FF1_S_HFn;
  66                                 FF2_S_FFn <= FF1_S_FFn;
  67                                 FF2_R_EFn <= FF1_R_EFn;
  68                                 FF2_R_HFn <= FF1_R_HFn;
  69                                 FF2_R_FFn <= FF1_R_FFn;
  70
  71                         elsif HOLD = '1' then
  72                                 FF2_S_EFn <= FF2_S_EFn;
  73                                 FF2_S_HFn <= FF2_S_HFn;
  74                                 FF2_S_FFn <= FF2_S_FFn;
  75                                 FF2_R_EFn <= FF2_R_EFn;
  76                                 FF2_R_HFn <= FF2_R_HFn;
  77                                 FF2_R_FFn <= FF2_R_FFn;
  78                         end if;
  79                 end if;
  80         end process;
  81
  82 SYNC_FLAG(0) <= FLAG_IN_0;
  83 SYNC_FLAG(1) <= FF2_R_EFn;
  84 SYNC_FLAG(2) <= FF2_R_HFn;
  85 SYNC_FLAG(3) <= FF2_R_FFn;
  86 SYNC_FLAG(4) <= FLAG_IN_4;
  87 SYNC_FLAG(5) <= FF2_S_EFn;
  88 SYNC_FLAG(6) <= FF2_S_HFn;
  89 SYNC_FLAG(7) <= FF2_S_FFn;
  90
  91 end architecture FLAG_BUS_DESIGN;