ReedDecoder.bsv
上传用户:aoptech
上传日期:2014-09-22
资源大小:784k
文件大小:3k
- //----------------------------------------------------------------------//
- // The MIT License
- //
- // Copyright (c) 2007 Alfred Man Cheuk Ng, mcn02@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.
- //----------------------------------------------------------------------//
- import DataTypes::*;
- import Interfaces::*;
- import Controls::*;
- import FIFO::*;
- import Vector::*;
- import GetPut::*;
- module mkReedDecoder#(function ReedSolomonCtrl#(8) mapCtrl(ctrl_t ctrl))
- (ReedDecoder#(ctrl_t,sz,sz))
- provisos(Mul#(num,8,sz),
- Bits#(ctrl_t, ctrl_sz));
- FIFO#(DecoderMesg#(ctrl_t,sz,Bit#(1))) inQ <- mkLFIFO;
- FIFO#(DecoderMesg#(ctrl_t,sz,Bit#(1))) outQ <- mkSizedFIFO(2);
- Reg#(ctrl_t) control <- mkRegU;
- Reg#(Bit#(8)) inCounter <- mkReg(0);
- Reg#(Bit#(8)) outCounter <- mkReg(0);
- rule outTime (outCounter != 0);
- inQ.deq();
- let newOutCounter = outCounter - fromInteger(valueOf(num));
- outCounter <= newOutCounter;
- endrule
- rule normal (outCounter == 0);
- let mesg = inQ.first();
- inQ.deq();
- control <= mesg.control;
- let ctrl = mapCtrl(mesg.control);
- if(ctrl.in == 12)
- outQ.enq(mesg);
- else
- begin
- let newInCounter = inCounter == 0 ? ctrl.in - fromInteger(valueOf(num)) : inCounter - fromInteger(valueOf(num));
- let newOutCounter = newInCounter == 0 ? ctrl.out : 0;
- inCounter <= newInCounter;
- outCounter <= newOutCounter;
- outQ.enq(mesg);
- end
- endrule
- interface in = fifoToPut(inQ);
- interface out = fifoToGet(outQ);
- endmodule