Subversion Repositories bluespec-80211atransmitter

// The MIT License

//

// Copyright (c) 2006 Nirav Dave (ndave@csail.mit.edu)

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

// THE SOFTWARE.

// *************************************************************************

//  Scrambler.bsv

// *************************************************************************

import DataTypes::*;

import Interfaces::*;

import LibraryFunctions::*;

import FIFO::*;

interface Scrambler#(type n);

   //inputs

   method Action fromControl(RateData#(n) x);

   //outputs

   method ActionValue#(RateData#(n))  toEncoder();

endinterface

(* synthesize *)

module mkScrambler_48(Scrambler#(24));

   let _s <- mkScrambler();

   return (_s);

endmodule

module mkScrambler(Scrambler#(n));

  Reg#(Bit#(7))       seqR <- mkRegU;

  FIFO#(RateData#(n)) outQ <- mkFIFO();

  method Action fromControl(RateData#(n) x);

     Bit#(7) headSeq = case (x.rate)

                          R1   : return 7'b1001011;

                          R2   : return 7'b1001011;

                          R4   : return 7'b1001011;

                          RNone: return seqR;

                       endcase;

     Bit#(7) scram_seq = headSeq;

     Bit#(1) newS;

     Bit#(n) inData  = x.data;

     Bit#(n) outData = 0;

     for(Integer i = 0; i < valueOf(n); i = i + 1)

        begin

           newS = scram_seq[0] ^ scram_seq[3];

           outData[i] = newS ^ inData[i];

           scram_seq = {newS,scram_seq[6:1]};

        end

     outQ.enq(RateData{

        rate: x.rate,

        data: outData

        });

   endmethod

   method ActionValue#(RateData#(n)) toEncoder();

      outQ.deq();

      return(outQ.first());

   endmethod

endmodule