add fdx-b to cmddata.h
[proxmark3-svn] / fpga / clk_divider.v
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1//-----------------------------------------------------------------------------
2// Copyright (C) 2014 iZsh <izsh at fail0verflow.com>
3//
4// This code is licensed to you under the terms of the GNU GPL, version 2 or,
5// at your option, any later version. See the LICENSE.txt file for the text of
6// the license.
7//-----------------------------------------------------------------------------
8module clk_divider(input clk, input [7:0] divisor, output [7:0] div_cnt, output div_clk);
9
10 reg [7:0] div_cnt_ = 0;
11 reg div_clk_;
12 assign div_cnt = div_cnt_;
13 assign div_clk = div_clk_;
14
15 always @(posedge clk)
16 begin
17 if(div_cnt == divisor) begin
18 div_cnt_ <= 8'd0;
19 div_clk_ = !div_clk_;
20 end else
21 div_cnt_ <= div_cnt_ + 1;
22 end
23
24endmodule
25
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