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[/] [wb_lcd/] [trunk/] [verilog/] [wb_lcd/] [rtl/] [delay_counter.v] - Blame information for rev 2

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1 2 jvillar
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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////  delay_counter.v                                             ////
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////                                                              ////
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////  This file is part of:                                       ////
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////  WISHBONE/MEM MAPPED CONTROLLER FOR LCD CHARACTER DISPLAYS   ////
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////  http://www.opencores.org/projects/wb_lcd/                   ////
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////                                                              ////
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////  Description                                                 ////
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////   -  Delay down counter.                                     ////
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////                                                              ////
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////  To Do:                                                      ////
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////   - nothing really                                           ////
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////                                                              ////
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////  Author(s):                                                  ////
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////   - José Ignacio Villar, jose@dte.us.es , jvillar@gmail.com  ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// Copyright (C) 2009 José Ignacio Villar - jvillar@gmail.com   ////
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////                                                              ////
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//// This source file may be used and distributed without         ////
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//// restriction provided that this copyright statement is not    ////
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//// removed from the file and that any derivative work contains  ////
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//// the original copyright notice and the associated disclaimer. ////
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////                                                              ////
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//// This source file is free software; you can redistribute it   ////
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//// and/or modify it under the terms of the GNU Lesser General   ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 3 of the License, or (at your option) any     ////
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//// later version.                                               ////
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////                                                              ////
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//// This source is distributed in the hope that it will be       ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
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//// PURPOSE.  See the GNU Lesser General Public License for more ////
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//// details.                                                     ////
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////                                                              ////
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//// You should have received a copy of the GNU Lesser General    ////
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//// Public License along with this source; if not, download it   ////
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//// from http://www.gnu.org/licenses/lgpl.txt                    ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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`include "lcd_defines.v"
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module delay_counter #(
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        parameter counter_width = 32
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) (
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        input clk,
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        input reset,
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        input [counter_width-1:0] count,
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        input load,
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        output done
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        );
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reg [counter_width-1:0] counter;
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always @(posedge clk)
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        if(load)
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                counter <= count;
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        else //if (!done)
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                counter <= counter - 1'b1;
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assign done = (counter == 0);
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endmodule

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