git.zerfleddert.de Git - raggedstone/blob - dhwk/source/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
  51                 FF1_S_EFn       <=      not S_EFn;
  52                 FF1_S_HFn       <=      not S_HFn;
  53                 FF1_S_FFn       <=      not S_FFn;
  54                 FF1_R_EFn       <=      not R_EFn;
  55                 FF1_R_HFn       <=      not R_HFn;
  56                 FF1_R_FFn       <=      not R_FFn;
  57
  58                 end if;
  59         end process;
  60
  61
  62         process (PCI_CLOCK)
  63         begin
  64                 if      (PCI_CLOCK'event        and     PCI_CLOCK       =       '1')    then
  65
  66                         if                      HOLD    =       '0'     then
  67
  68                                         FF2_S_EFn       <=      FF1_S_EFn;
  69                                         FF2_S_HFn       <=      FF1_S_HFn;
  70                                         FF2_S_FFn       <=      FF1_S_FFn;
  71                                         FF2_R_EFn       <=      FF1_R_EFn;
  72                                         FF2_R_HFn       <=      FF1_R_HFn;
  73                                         FF2_R_FFn       <=      FF1_R_FFn;
  74
  75                                 elsif   HOLD    =       '1'     then
  76
  77                                         FF2_S_EFn       <=      FF2_S_EFn;
  78                                         FF2_S_HFn       <=      FF2_S_HFn;
  79                                         FF2_S_FFn       <=      FF2_S_FFn;
  80                                         FF2_R_EFn       <=      FF2_R_EFn;
  81                                         FF2_R_HFn       <=      FF2_R_HFn;
  82                                         FF2_R_FFn       <=      FF2_R_FFn;
  83
  84                         end if;
  85                 end if;
  86         end process;
  87
  88         SYNC_FLAG(0)    <=      FLAG_IN_0;
  89         SYNC_FLAG(1)    <=      FF2_R_EFn;
  90         SYNC_FLAG(2)    <=      FF2_R_HFn;
  91         SYNC_FLAG(3)    <=      FF2_R_FFn;
  92         SYNC_FLAG(4)    <=      FLAG_IN_4;
  93         SYNC_FLAG(5)    <=      FF2_S_EFn;
  94         SYNC_FLAG(6)    <=      FF2_S_HFn;
  95         SYNC_FLAG(7)    <=      FF2_S_FFn;
  96
  97 end architecture FLAG_BUS_DESIGN;
  98