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

   1 -----------------------------------------------------------------------------
   2 -- --
   3 -- Copyright (c) 1997 by Synplicity, Inc. All rights reserved. --
   4 -- --
   5 -- This source file may be used and distributed without restriction --
   6 -- provided that this copyright statement is not removed from the file --
   7 -- and that any derivative work contains this copyright notice. --
   8 -- --
   9 -- Primitive library for post synthesis simulation --
  10 -- These models are not intended for efficient synthesis --
  11 -- --
  12 -----------------------------------------------------------------------------
  13 library ieee;
  14 use ieee.std_logic_1164.all;
  15 entity prim_counter is
  16         generic (w : integer := 8);
  17         port (
  18                      q : buffer std_logic_vector(w - 1 downto 0);
  19                      cout : out std_logic;
  20                      d : in std_logic_vector(w - 1 downto 0);
  21                      cin : in std_logic;
  22                      clk : in std_logic;
  23                      rst : in std_logic;
  24                      load : in std_logic;
  25                      en : in std_logic;
  26                      updn : in std_logic
  27              );
  28 end prim_counter;
  29
  30 architecture beh of prim_counter is
  31         signal nextq : std_logic_vector(w - 1 downto 0);
  32 begin
  33         nxt: process (q, cin, updn)
  34                 variable i : integer;
  35                 variable nextc, c : std_logic;
  36         begin
  37                 nextc := cin;
  38                 for i in 0 to w - 1 loop
  39                         c := nextc;
  40                         nextq(i) <= c xor (not updn) xor q(i);
  41                         nextc := (c and (not updn)) or
  42                         (c and q(i)) or
  43                         ((not updn) and q(i));
  44                 end loop;
  45                 cout <= nextc;
  46         end process;
  47
  48         ff : process (clk, rst)
  49         begin
  50                 if rst = '1' then
  51                         q <= (others => '0');
  52                 elsif rising_edge(clk) then
  53                         q <= nextq;
  54                 end if;
  55         end process ff;
  56 end beh;
  57
  58 library ieee;
  59 use ieee.std_logic_1164.all;
  60 entity prim_dff is
  61         port (q : out std_logic;
  62               d : in std_logic;
  63               clk : in std_logic;
  64               r : in std_logic := '0';
  65               s : in std_logic := '0');
  66 end prim_dff;
  67
  68 architecture beh of prim_dff is
  69 begin
  70         ff : process (clk, r, s)
  71         begin
  72                 if r = '1' then
  73                         q <= '0';
  74                 elsif s = '1' then
  75                         q <= '1';
  76                 elsif rising_edge(clk) then
  77                         q <= d;
  78                 end if;
  79         end process ff;
  80 end beh;
  81
  82 library ieee;
  83 use ieee.std_logic_1164.all;
  84 entity prim_latch is
  85         port (q : out std_logic;
  86               d : in std_logic;
  87               clk : in std_logic;
  88               r : in std_logic := '0';
  89               s : in std_logic := '0');
  90 end prim_latch;
  91
  92 architecture beh of prim_latch is
  93 begin
  94         q <= '0' when r = '1' else
  95              '1' when s = '1' else
  96              d when clk = '1';
  97 end beh;
  98
  99
 100 library ieee;
 101 use ieee.std_logic_1164.all;
 102 use ieee.std_logic_unsigned.all;
 103
 104 entity prim_ramd is
 105         generic (
 106                         data_width : integer := 4;
 107                         addr_width : integer := 5);
 108         port (
 109                      dout : out std_logic_vector(data_width-1 downto 0);
 110                      aout : in std_logic_vector(addr_width-1 downto 0);
 111                      din : in std_logic_vector(data_width-1 downto 0);
 112                      ain : in std_logic_vector(addr_width-1 downto 0);
 113                      we : in std_logic;
 114                      clk : in std_logic);
 115 end prim_ramd;
 116
 117 architecture beh of prim_ramd is
 118
 119         constant depth : integer := 2** addr_width;
 120         type mem_type is array (depth-1 downto 0) of std_logic_vector (data_width-1 downto 0);
 121         signal mem: mem_type;
 122
 123 begin
 124
 125         dout <= mem(conv_integer(aout));
 126
 127         process (clk)
 128         begin
 129                 if rising_edge(clk) then
 130                         if (we = '1') then
 131                                 mem(conv_integer(ain)) <= din;
 132                         end if;
 133                 end if;
 134         end process;
 135
 136 end beh;
 137
 138
 139 library ieee;
 140 use ieee.std_logic_1164.all;
 141 package components is
 142         component prim_counter
 143                 generic (w : integer);
 144                 port (
 145                              q : buffer std_logic_vector(w - 1 downto 0);
 146                              cout : out std_logic;
 147                              d : in std_logic_vector(w - 1 downto 0);
 148                              cin : in std_logic;
 149                              clk : in std_logic;
 150                              rst : in std_logic;
 151                              load : in std_logic;
 152                              en : in std_logic;
 153                              updn : in std_logic
 154                      );
 155         end component;
 156         component prim_dff
 157                 port (q : out std_logic;
 158                       d : in std_logic;
 159                       clk : in std_logic;
 160                       r : in std_logic := '0';
 161                       s : in std_logic := '0');
 162         end component;
 163         component prim_latch
 164                 port (q : out std_logic;
 165                       d : in std_logic;
 166                       clk : in std_logic;
 167                       r : in std_logic := '0';
 168                       s : in std_logic := '0');
 169         end component;
 170
 171         component prim_ramd is
 172                 generic (
 173                                 data_width : integer := 4;
 174                                 addr_width : integer := 5);
 175                 port (
 176                              dout : out std_logic_vector(data_width-1 downto 0);
 177                              aout : in std_logic_vector(addr_width-1 downto 0);
 178                              din : in std_logic_vector(data_width-1 downto 0);
 179                              ain : in std_logic_vector(addr_width-1 downto 0);
 180                              we : in std_logic;
 181                              clk : in std_logic);
 182         end component;
 183
 184 end components;