Subversion Repositories wb_lcd

//////////////////////////////////////////////////////////////////////

////                                                              ////

////  delay_counter.v                                             ////

////                                                              ////

////  This file is part of:                                       ////

////  WISHBONE/MEM MAPPED CONTROLLER FOR LCD CHARACTER DISPLAYS   ////

////  http://www.opencores.org/projects/wb_lcd/                   ////

////                                                              ////

////  Description                                                 ////

////   -  Delay down counter.                                     ////

////                                                              ////

////  To Do:                                                      ////

////   - nothing really                                           ////

////                                                              ////

////  Author(s):                                                  ////

////   - José Ignacio Villar, jose@dte.us.es , jvillar@gmail.com  ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2009 José Ignacio Villar - jvillar@gmail.com   ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 3 of the License, or (at your option) any     ////

//// later version.                                               ////

////                                                              ////

//// This source is distributed in the hope that it will be       ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

//// PURPOSE.  See the GNU Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.gnu.org/licenses/lgpl.txt                    ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

`include "lcd_defines.v"

module delay_counter #(

        parameter counter_width = 32

) (

        input clk,

        input reset,

        input [counter_width-1:0] count,

        input load,

        output done

        );

reg [counter_width-1:0] counter;

always @(posedge clk)

        if(load)

                counter <= count;

        else //if (!done)

                counter <= counter - 1'b1;

assign done = (counter == 0);

endmodule