3 // USRP - Universal Software Radio Peripheral
5 // Copyright (C) 2003 Matt Ettus
7 // This program is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 2 of the License, or
10 // (at your option) any later version.
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301 USA
23 module clk_divider(input reset, input wire in_clk,output reg out_clk, input [7:0] ratio);
26 // FIXME maybe should use PLL or switch to double edge version
28 always @(posedge in_clk or posedge reset)
32 counter <= #1 ratio[7:1] + (ratio[0] & out_clk) - 8'b1;
34 counter <= #1 counter-8'd1;
36 always @(posedge in_clk or posedge reset)
40 out_clk <= #1 ~out_clk;
42 endmodule // clk_divider