// -*- 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