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/* This file is part of JT51. JT51 is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. JT51 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 JT51. If not, see <http://www.gnu.org/licenses/>. Author: Jose Tejada Gomez. Twitter: @topapate Version: 1.0 Date: 27-10-2016 */ `timescale 1ns / 1ps /* tab size 4 */ module jt51_lfo_lfsr #(parameter init=220 )( input rst, input clk, input base, output out ); reg [18:0] bb; assign out = bb[18]; reg last_base; always @(posedge clk) begin : base_counter if( rst ) begin bb <= init[18:0]; last_base <= 1'b0; end else begin last_base <= base; if( last_base != base ) begin bb[18:1] <= bb[17:0]; bb[0] <= ^{bb[0],bb[1],bb[14],bb[15],bb[17],bb[18]}; end end end endmodule