rtl/Icarus/progmem.v

   1 // -----------------------------------------------------------------------
   2 //
   3 //   Copyright 2004 Tommy Thorn - All Rights Reserved
   4 //
   5 //   This program is free software; you can redistribute it and/or modify
   6 //   it under the terms of the GNU General Public License as published by
   7 //   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   8 //   Bostom MA 02111-1307, USA; either version 2 of the License, or
   9 //   (at your option) any later version; incorporated herein by reference.
  10 //
  11 // -----------------------------------------------------------------------
  12
  13 `timescale 1ns/10ps
  14
  15 module progmem(input  wire        clock,
  16                input  wire        rden,
  17                input  wire [6:0]  rdaddress,
  18                input  wire [6:0]  wraddress,
  19                input  wire        wren,
  20                input  wire [31:0] data,
  21                output wire [31:0] q);
  22
  23    reg [ 6:0] addr_delayed;
  24    reg [31:0] ram[(1<<7) - 1:0];
  25
  26    assign q = ram[addr_delayed];
  27
  28    always @(posedge clock)
  29      if (rden)
  30        addr_delayed <= rdaddress;
  31
  32
  33    initial
  34      $readmemh("initmem.data", ram);
  35 endmodule