Subversion Repositories bluespec-h264

// The MIT License

// Copyright (c) 2006-2007 Massachusetts Institute of Technology

// 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.

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

// Frame Buffer

//----------------------------------------------------------------------

//

//

//

package mkFrameBuffer;

import H264Types::*;

import IFrameBuffer::*;

import RegFile::*;

import GetPut::*;

import ClientServer::*;

import FIFO::*;

//-----------------------------------------------------------

// Register file module

//-----------------------------------------------------------

interface FBRFile2;

   method Action store( Bit#(FrameBufferSz) addr, Bit#(32) data );

   method Bit#(32) load1( Bit#(FrameBufferSz) addr );

   method Bit#(32) load2( Bit#(FrameBufferSz) addr );

endinterface

module mkFBRFile2( FBRFile2 );

   RegFile#(Bit#(FrameBufferSz),Bit#(32)) rfile <- mkRegFile(0,frameBufferSize);

   method Action store( Bit#(FrameBufferSz) addr, Bit#(32) data );

      rfile.upd( addr, data );

   endmethod

   method Bit#(32) load1( Bit#(FrameBufferSz) addr );

      return rfile.sub(addr);

   endmethod

   method Bit#(32) load2( Bit#(FrameBufferSz) addr );

      return rfile.sub(addr);

   endmethod

endmodule

//----------------------------------------------------------------------

// Main module

//----------------------------------------------------------------------

module mkFrameBuffer( IFrameBuffer );

  //-----------------------------------------------------------

  // State

   FBRFile2 rfile2 <- mkFBRFile2;

   FIFO#(FrameBufferLoadReq)  loadReqQ1  <- mkFIFO();

   FIFO#(FrameBufferLoadResp) loadRespQ1 <- mkFIFO();

   FIFO#(FrameBufferLoadReq)  loadReqQ2  <- mkFIFO();

   FIFO#(FrameBufferLoadResp) loadRespQ2 <- mkFIFO();

   FIFO#(FrameBufferStoreReq) storeReqQ  <- mkFIFO();

   rule loading1 ( loadReqQ1.first() matches tagged FBLoadReq .addrt );

      if(addrt

         begin

            loadRespQ1.enq( tagged FBLoadResp rfile2.load1(addrt) );

            loadReqQ1.deq();

         end

      else

         $display( "ERROR FrameBuffer: loading1 outside range" );

   endrule

   rule loading2 ( loadReqQ2.first() matches tagged FBLoadReq .addrt );

      if(addrt

         begin

            loadRespQ2.enq( tagged FBLoadResp rfile2.load2(addrt) );

            loadReqQ2.deq();

         end

      else

         $display( "ERROR FrameBuffer: loading2 outside range" );

   endrule

   rule storing ( storeReqQ.first() matches tagged FBStoreReq { addr:.addrt,data:.datat} );

      if(addrt

         begin

            rfile2.store(addrt,datat);

            storeReqQ.deq();

         end

      else

         $display( "ERROR FrameBuffer: storing outside range" );

   endrule

   rule syncing ( loadReqQ1.first() matches tagged FBEndFrameSync &&& loadReqQ2.first() matches tagged FBEndFrameSync &&& storeReqQ.first() matches tagged FBEndFrameSync);

      loadReqQ1.deq();

      loadReqQ2.deq();

      storeReqQ.deq();

   endrule

   interface Server server_load1;

      interface Put request   = fifoToPut(loadReqQ1);

      interface Get response  = fifoToGet(loadRespQ1);

   endinterface

   interface Server server_load2;

      interface Put request   = fifoToPut(loadReqQ2);

      interface Get response  = fifoToGet(loadRespQ2);

   endinterface

   interface Put server_store = fifoToPut(storeReqQ);

endmodule

endpackage