// The MIT License
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// The MIT License
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// Copyright (c) 2006-2007 Massachusetts Institute of Technology
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// Copyright (c) 2006-2007 Massachusetts Institute of Technology
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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// all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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// THE SOFTWARE.
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//**********************************************************************
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//**********************************************************************
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// NAL unit unwrapper implementation
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// NAL unit unwrapper implementation
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//----------------------------------------------------------------------
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//----------------------------------------------------------------------
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//
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//
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//
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//
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package mkNalUnwrap;
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package mkNalUnwrap;
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import H264Types::*;
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import H264Types::*;
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import INalUnwrap::*;
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import INalUnwrap::*;
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import FIFO::*;
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import FIFO::*;
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import Connectable::*;
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import Connectable::*;
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import GetPut::*;
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import GetPut::*;
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//-----------------------------------------------------------
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//-----------------------------------------------------------
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// NAL Unwrapper Module
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// NAL Unwrapper Module
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//-----------------------------------------------------------
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//-----------------------------------------------------------
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module mkNalUnwrap( INalUnwrap );
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module mkNalUnwrap( INalUnwrap );
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FIFO#(InputGenOT) infifo <- mkFIFO;
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FIFO#(InputGenOT) infifo <- mkFIFO;
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FIFO#(NalUnwrapOT) outfifo <- mkFIFO;
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FIFO#(NalUnwrapOT) outfifo <- mkFIFO;
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Reg#(Bit#(8)) buffera <- mkReg(0);
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Reg#(Bit#(8)) buffera <- mkReg(0);
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Reg#(Bit#(8)) bufferb <- mkReg(0);
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Reg#(Bit#(8)) bufferb <- mkReg(0);
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Reg#(Bit#(8)) bufferc <- mkReg(0);
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Reg#(Bit#(8)) bufferc <- mkReg(0);
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Reg#(Bit#(2)) bufcount <- mkReg(0);
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Reg#(Bit#(2)) bufcount <- mkReg(0);
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Reg#(Bit#(27)) zerocount <- mkReg(0);
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Reg#(Bit#(27)) zerocount <- mkReg(0);
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//-----------------------------------------------------------
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//-----------------------------------------------------------
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// Rules
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// Rules
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rule fillbuffer (bufcount<3
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rule fillbuffer (bufcount<3
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&&& infifo.first() matches tagged DataByte .dbyte);
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&&& infifo.first() matches tagged DataByte .dbyte);
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bufferc <= bufferb;
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bufferc <= bufferb;
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bufferb <= buffera;
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bufferb <= buffera;
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buffera <= dbyte;
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buffera <= dbyte;
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bufcount <= bufcount+1;
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bufcount <= bufcount+1;
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infifo.deq();
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infifo.deq();
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endrule
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endrule
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rule newnalunit (bufcount==3
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rule newnalunit (bufcount==3
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&&& infifo.first() matches tagged DataByte .dbyte
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&&& infifo.first() matches tagged DataByte .dbyte
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&&& ((bufferc==0 && bufferb==0 && buffera==1)
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&&& ((bufferc==0 && bufferb==0 && buffera==1)
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|| (bufferc==0 && bufferb==0 && buffera==0 && dbyte==1)));
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|| (bufferc==0 && bufferb==0 && buffera==0 && dbyte==1)));
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zerocount <= 0;
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zerocount <= 0;
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if(bufferc==0 && bufferb==0 && buffera==1)
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if(bufferc==0 && bufferb==0 && buffera==1)
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bufcount <= 0;
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bufcount <= 0;
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else
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else
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begin
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begin
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bufcount <= 0;
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bufcount <= 0;
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infifo.deq();
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infifo.deq();
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end
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end
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outfifo.enq(NewUnit);
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outfifo.enq(NewUnit);
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$display("ccl1newunit");
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$display("ccl1newunit");
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endrule
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endrule
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rule remove3byte (bufcount==3
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rule remove3byte (bufcount==3
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&&& infifo.first() matches tagged DataByte .dbyte
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&&& infifo.first() matches tagged DataByte .dbyte
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&&& (bufferc==0 && bufferb==0 && buffera==3 && dbyte<4));
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&&& (bufferc==0 && bufferb==0 && buffera==3 && dbyte<4));
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zerocount <= zerocount+2;
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zerocount <= zerocount+2;
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bufcount <= 0;
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bufcount <= 0;
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endrule
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endrule
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rule normalop (bufcount==3
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rule normalop (bufcount==3
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&&& infifo.first() matches tagged DataByte .dbyte
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&&& infifo.first() matches tagged DataByte .dbyte
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&&& !(bufferc==0 && bufferb==0 && buffera==3 && dbyte<4)
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&&& !(bufferc==0 && bufferb==0 && buffera==3 && dbyte<4)
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&&& !((bufferc==0 && bufferb==0 && buffera==1)
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&&& !((bufferc==0 && bufferb==0 && buffera==1)
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|| (bufferc==0 && bufferb==0 && buffera==0 && dbyte==1)));
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|| (bufferc==0 && bufferb==0 && buffera==0 && dbyte==1)));
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if(bufferc==0)
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if(bufferc==0)
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begin
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begin
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zerocount <= zerocount+1;
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zerocount <= zerocount+1;
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bufferc <= bufferb;
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bufferc <= bufferb;
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bufferb <= buffera;
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bufferb <= buffera;
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buffera <= dbyte;
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buffera <= dbyte;
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infifo.deq();
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infifo.deq();
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end
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end
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else if(zerocount==0)
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else if(zerocount==0)
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begin
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begin
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outfifo.enq(tagged RbspByte bufferc);
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outfifo.enq(tagged RbspByte bufferc);
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$display("ccl1rbspbyte %h", bufferc);
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$display("ccl1rbspbyte %h", bufferc);
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bufferc <= bufferb;
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bufferc <= bufferb;
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bufferb <= buffera;
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bufferb <= buffera;
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buffera <= dbyte;
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buffera <= dbyte;
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infifo.deq();
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infifo.deq();
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end
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end
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else
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else
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begin
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begin
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zerocount <= zerocount-1;
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zerocount <= zerocount-1;
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outfifo.enq(tagged RbspByte 0);
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outfifo.enq(tagged RbspByte 0);
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$display("ccl1rbspbyte 00");
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$display("ccl1rbspbyte 00");
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end
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end
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endrule
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endrule
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rule endfileop(infifo.first() matches tagged EndOfFile);
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rule endfileop(infifo.first() matches tagged EndOfFile);
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case ( bufcount )
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case ( bufcount )
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3:
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3:
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begin
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begin
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if(bufferc==0 && bufferb==0 && buffera<4)
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if(bufferc==0 && bufferb==0 && buffera<4)
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begin
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begin
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bufcount <= 0;
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bufcount <= 0;
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zerocount <= 0;
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zerocount <= 0;
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end
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end
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else if(zerocount==0)
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else if(zerocount==0)
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begin
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begin
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bufcount <= 2;
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bufcount <= 2;
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outfifo.enq(tagged RbspByte bufferc);
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outfifo.enq(tagged RbspByte bufferc);
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$display("ccl1rbspbyte %h", bufferc);
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$display("ccl1rbspbyte %h", bufferc);
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end
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end
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else
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else
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begin
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begin
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zerocount <= zerocount-1;
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zerocount <= zerocount-1;
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outfifo.enq(tagged RbspByte 0);
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outfifo.enq(tagged RbspByte 0);
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$display("ccl1rbspbyte 00");
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$display("ccl1rbspbyte 00");
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end
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end
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end
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end
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2:
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2:
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begin
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begin
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bufcount <= 1;
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bufcount <= 1;
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if(!(bufferb==0 && buffera==0))
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if(!(bufferb==0 && buffera==0))
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outfifo.enq(tagged RbspByte bufferb);
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outfifo.enq(tagged RbspByte bufferb);
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$display("ccl1rbspbyte %h", bufferb);
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$display("ccl1rbspbyte %h", bufferb);
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end
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end
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1:
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1:
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begin
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begin
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bufcount <= 0;
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bufcount <= 0;
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if(!(buffera==0))
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if(!(buffera==0))
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outfifo.enq(tagged RbspByte buffera);
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outfifo.enq(tagged RbspByte buffera);
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$display("ccl1rbspbyte %h", buffera);
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$display("ccl1rbspbyte %h", buffera);
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end
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end
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0:
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0:
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begin
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begin
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infifo.deq();
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infifo.deq();
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outfifo.enq(tagged EndOfFile);
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outfifo.enq(tagged EndOfFile);
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$display("EndOfFile reached (NalUnwrap)");
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$display("EndOfFile reached (NalUnwrap)");
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end
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end
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endcase
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endcase
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endrule
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endrule
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interface Put ioin = fifoToPut(infifo);
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interface Put ioin = fifoToPut(infifo);
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interface Get ioout = fifoToGet(outfifo);
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interface Get ioout = fifoToGet(outfifo);
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endmodule
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endmodule
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endpackage
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endpackage
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