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[/] [usbhostslave/] [tags/] [rel_01_01/] [RTL/] [buffers/] [RxFifo.v] - Rev 40
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////////////////////////////////////////////////////////////////////// //// //// //// RxFifo.v //// //// //// //// This file is part of the usbhostslave opencores effort. //// <http://www.opencores.org/cores//> //// //// //// //// Module Description: //// //// parameterized RxFifo wrapper. Min depth = 2, Max depth = 65536 //// fifo read access via bus interface, fifo write access is direct //// //// //// //// To Do: //// //// //// //// //// Author(s): //// //// - Steve Fielding, sfielding@base2designs.com //// //// //// ////////////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2004 Steve Fielding and OPENCORES.ORG //// //// //// //// This source file may be used and distributed without //// //// restriction provided that this copyright statement is not //// //// removed from the file and that any derivative work contains //// //// the original copyright notice and the associated disclaimer. //// //// //// //// This source file is free software; you can redistribute it //// //// and/or modify it under the terms of the GNU Lesser General //// //// Public License as published by the Free Software Foundation; //// //// either version 2.1 of the License, or (at your option) any //// //// later version. //// //// //// //// This source is distributed in the hope that it will be //// //// useful, but WITHOUT ANY WARRANTY; without even the implied //// //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// //// PURPOSE. See the GNU Lesser General Public License for more //// //// details. //// //// //// //// You should have received a copy of the GNU Lesser General //// //// Public License along with this source; if not, download it //// //// from <http://www.opencores.org/lgpl.shtml> //// //// //// ////////////////////////////////////////////////////////////////////// // `timescale 1ns / 1ps module RxFifo( busClk, usbClk, rstSyncToBusClk, rstSyncToUsbClk, fifoWEn, fifoFull, busAddress, busWriteEn, busStrobe_i, busFifoSelect, busDataIn, busDataOut, fifoDataIn ); //FIFO_DEPTH = ADDR_WIDTH^2 parameter FIFO_DEPTH = 64; parameter ADDR_WIDTH = 6; input busClk; input usbClk; input rstSyncToBusClk; input rstSyncToUsbClk; input fifoWEn; output fifoFull; input [2:0] busAddress; input busWriteEn; input busStrobe_i; input busFifoSelect; input [7:0] busDataIn; output [7:0] busDataOut; input [7:0] fifoDataIn; wire busClk; wire usbClk; wire rstSyncToBusClk; wire rstSyncToUsbClk; wire fifoWEn; wire fifoFull; wire [2:0] busAddress; wire busWriteEn; wire busStrobe_i; wire busFifoSelect; wire [7:0] busDataIn; wire [7:0] busDataOut; wire [7:0] fifoDataIn; //internal wires and regs wire [7:0] dataFromFifoToBus; wire fifoREn; wire forceEmptySyncToBusClk; wire forceEmptySyncToUsbClk; wire [15:0] numElementsInFifo; wire fifoEmpty; //not used fifoRTL #(8, FIFO_DEPTH, ADDR_WIDTH) u_fifo( .wrClk(usbClk), .rdClk(busClk), .rstSyncToWrClk(rstSyncToUsbClk), .rstSyncToRdClk(rstSyncToBusClk), .dataIn(fifoDataIn), .dataOut(dataFromFifoToBus), .fifoWEn(fifoWEn), .fifoREn(fifoREn), .fifoFull(fifoFull), .fifoEmpty(fifoEmpty), .forceEmptySyncToWrClk(forceEmptySyncToUsbClk), .forceEmptySyncToRdClk(forceEmptySyncToBusClk), .numElementsInFifo(numElementsInFifo) ); RxfifoBI u_RxfifoBI( .address(busAddress), .writeEn(busWriteEn), .strobe_i(busStrobe_i), .busClk(busClk), .usbClk(usbClk), .rstSyncToBusClk(rstSyncToBusClk), .fifoSelect(busFifoSelect), .fifoDataIn(dataFromFifoToBus), .busDataIn(busDataIn), .busDataOut(busDataOut), .fifoREn(fifoREn), .forceEmptySyncToBusClk(forceEmptySyncToBusClk), .forceEmptySyncToUsbClk(forceEmptySyncToUsbClk), .numElementsInFifo(numElementsInFifo) ); endmodule