3 // USRP - Universal Software Radio Peripheral
5 // Copyright (C) 2007 Corgan Enterprises LLC
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
22 module lfsr(clk_i,rst_i,ena_i,strobe_i,mask_i,pn_o);
29 input [width-1:0] mask_i;
33 reg [width-1:0] shifter;
35 wire parity = ^(shifter & mask_i);
37 always @(posedge clk_i)
42 shifter <= {shifter[width-2:0],parity};
44 assign pn_o = shifter[0];