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.

import RegFile::*;

import ISRAMWires::*;

interface ISRAMEmulator;

endinterface

module mkSRAMEmulator#(ISRAMWires wires) (ISRAMEmulator);

  RegFile#(Bit#(18), Bit#(32))  arr <- mkRegFileFull();

  Reg#(Bit#(18)) addr_p <- mkReg(0);

  Reg#(Bit#(18)) addr_pp <- mkReg(0);

  Reg#(Bit#(1))  we_p <- mkReg(0);

  Reg#(Bit#(1))  we_pp <- mkReg(0);

  rule tick;

    Bit#(18) addr_pt = wires.address_out();

    Bit#(32) data_Ot = wires.data_O();

    wires.data_I(arr.sub(addr_pp));

    addr_p <= addr_pt;

    addr_pp <= addr_p;

    we_p <= wires.we_out();

    we_pp <= we_p;

    if(we_pp == 1)

      begin

        //$display("MemClient SRAM Emulator: index %h reading %h", addr_pp, arr.sub(addr_pp));

      end

    else

      begin

        //$display("MemClient SRAM Emulator: index %h writing %h", addr_pp, data_Ot);

        arr.upd(addr_pp, data_Ot);

      end

  endrule

endmodule