--- /dev/null
+// -*- verilog -*-
+//
+// USRP - Universal Software Radio Peripheral
+//
+// Copyright (C) 2007 Corgan Enterprises LLC
+//
+// This program 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 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., 51 Franklin Street, Boston, MA 02110-1301 USA
+//
+
+module lfsr_constants(clk_i,rst_i,degree_i,mask_o,len_o);
+ input clk_i;
+ input rst_i;
+ input [4:0] degree_i;
+ output reg [15:0] mask_o;
+ output reg [16:0] len_o;
+
+ integer len;
+
+ always @(posedge clk_i)
+ if (rst_i)
+ begin
+ len_o <= #5 17'b0;
+ mask_o <= #5 16'b0;
+ end
+ else
+ begin
+ len_o <= #5 ((1 << degree_i) << 1)-3;
+
+ case (degree_i)
+ 5'd00: mask_o <= #5 16'h0000;
+ 5'd01: mask_o <= #5 16'h0001;
+ 5'd02: mask_o <= #5 16'h0003;
+ 5'd03: mask_o <= #5 16'h0005;
+ 5'd04: mask_o <= #5 16'h0009;
+ 5'd05: mask_o <= #5 16'h0012;
+ 5'd06: mask_o <= #5 16'h0021;
+ 5'd07: mask_o <= #5 16'h0041;
+ 5'd08: mask_o <= #5 16'h008E;
+ 5'd09: mask_o <= #5 16'h0108;
+ 5'd10: mask_o <= #5 16'h0204;
+ 5'd11: mask_o <= #5 16'h0402;
+ 5'd12: mask_o <= #5 16'h0829;
+ 5'd13: mask_o <= #5 16'h100D;
+ 5'd14: mask_o <= #5 16'h2015;
+ 5'd15: mask_o <= #5 16'h4001;
+ 5'd16: mask_o <= #5 16'h8016;
+ default: mask_o <= #5 16'h0000;
+ endcase // case(degree_i)
+ end // else: !if(rst_i)
+
+endmodule // lfsr_constants