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[/] [openrisc/] [trunk/] [orpsocv2/] [rtl/] [verilog/] [usbhostslave/] [RxFifo.v] - Blame information for rev 584

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1 408 julius
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// RxFifo.v                                                     ////
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////                                                              ////
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//// This file is part of the usbhostslave opencores effort.
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//// <http://www.opencores.org/cores//>                           ////
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////                                                              ////
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//// Module Description:                                          ////
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////  parameterized RxFifo wrapper. Min depth = 2, Max depth = 65536
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////  fifo read access via bus interface, fifo write access is direct
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//// 
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////                                                              ////
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//// To Do:                                                       ////
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//// 
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////                                                              ////
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//// Author(s):                                                   ////
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//// - Steve Fielding, sfielding@base2designs.com                 ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// Copyright (C) 2004 Steve Fielding and OPENCORES.ORG          ////
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////                                                              ////
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//// This source file may be used and distributed without         ////
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//// restriction provided that this copyright statement is not    ////
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//// removed from the file and that any derivative work contains  ////
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//// the original copyright notice and the associated disclaimer. ////
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////                                                              ////
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//// This source file is free software; you can redistribute it   ////
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//// and/or modify it under the terms of the GNU Lesser General   ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any   ////
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//// later version.                                               ////
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////                                                              ////
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//// This source is distributed in the hope that it will be       ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
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//// PURPOSE. See the GNU Lesser General Public License for more  ////
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//// details.                                                     ////
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////                                                              ////
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//// You should have received a copy of the GNU Lesser General    ////
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//// Public License along with this source; if not, download it   ////
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//// from <http://www.opencores.org/lgpl.shtml>                   ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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//
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`include "timescale.v"
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module RxFifo(
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  busClk,
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  usbClk,
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  rstSyncToBusClk,
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  rstSyncToUsbClk,
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  fifoWEn,
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  fifoFull,
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  busAddress,
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  busWriteEn,
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  busStrobe_i,
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  busFifoSelect,
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  busDataIn,
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  busDataOut,
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  fifoDataIn  );
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  //FIFO_DEPTH = ADDR_WIDTH^2
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  parameter FIFO_DEPTH = 64;
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  parameter ADDR_WIDTH = 6;
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input busClk;
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input usbClk;
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input rstSyncToBusClk;
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input rstSyncToUsbClk;
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input fifoWEn;
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output fifoFull;
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input [2:0] busAddress;
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input busWriteEn;
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input busStrobe_i;
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input busFifoSelect;
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input [7:0] busDataIn;
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output [7:0] busDataOut;
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input [7:0] fifoDataIn;
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wire busClk;
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wire usbClk;
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wire rstSyncToBusClk;
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wire rstSyncToUsbClk;
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wire fifoWEn;
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wire fifoFull;
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wire [2:0] busAddress;
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wire busWriteEn;
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wire busStrobe_i;
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wire busFifoSelect;
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wire [7:0] busDataIn;
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wire [7:0] busDataOut;
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wire [7:0] fifoDataIn;
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//internal wires and regs
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wire [7:0] dataFromFifoToBus;
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wire fifoREn;
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wire forceEmptySyncToBusClk;
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wire forceEmptySyncToUsbClk;
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wire [15:0] numElementsInFifo;
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wire fifoEmpty;   //not used
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fifoRTL #(8, FIFO_DEPTH, ADDR_WIDTH) u_fifo(
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  .wrClk(usbClk),
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  .rdClk(busClk),
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  .rstSyncToWrClk(rstSyncToUsbClk),
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  .rstSyncToRdClk(rstSyncToBusClk),
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  .dataIn(fifoDataIn),
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  .dataOut(dataFromFifoToBus),
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  .fifoWEn(fifoWEn),
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  .fifoREn(fifoREn),
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  .fifoFull(fifoFull),
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  .fifoEmpty(fifoEmpty),
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  .forceEmptySyncToWrClk(forceEmptySyncToUsbClk),
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  .forceEmptySyncToRdClk(forceEmptySyncToBusClk),
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  .numElementsInFifo(numElementsInFifo) );
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RxfifoBI u_RxfifoBI(
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  .address(busAddress),
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  .writeEn(busWriteEn),
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  .strobe_i(busStrobe_i),
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  .busClk(busClk),
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  .usbClk(usbClk),
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  .rstSyncToBusClk(rstSyncToBusClk),
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  .fifoSelect(busFifoSelect),
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  .fifoDataIn(dataFromFifoToBus),
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  .busDataIn(busDataIn),
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  .busDataOut(busDataOut),
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  .fifoREn(fifoREn),
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  .forceEmptySyncToBusClk(forceEmptySyncToBusClk),
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  .forceEmptySyncToUsbClk(forceEmptySyncToUsbClk),
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  .numElementsInFifo(numElementsInFifo)
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  );
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endmodule

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