iverilog/ivtest/fpga_tests/timer.v

34 lines
1.1 KiB
Verilog

/*
* Copyright (c) 2003 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* $Id: timer.v,v 1.1 2003/04/01 05:55:24 stevewilliams Exp $
*/
module timer(output wire rdy, input wire clk, input wire reset);
reg [4:0] count;
assign rdy = count[4];
always @(posedge clk or posedge reset)
if (reset)
count <= 5'h0f;
else
count <= count - 1;
endmodule // timer