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[/] [usbhostslave/] [tags/] [rel_00_01_alpha/] [RTL/] [buffers/] [simFifoMem.v] - Rev 2
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////////////////////////////////////////////////////////////////////// //// //// //// simFifoMem.v //// //// //// //// This file is part of the usbhostslave opencores effort. //// <http://www.opencores.org/cores//> //// //// //// //// Module Description: //// //// //// //// //// 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> //// //// //// ////////////////////////////////////////////////////////////////////// // // $Id: simFifoMem.v,v 1.1.1.1 2004-10-11 04:00:51 sfielding Exp $ // // CVS Revision History // // $Log: not supported by cvs2svn $ // `timescale 1ns / 1ps module simFifoMem( addrIn, addrOut, clk, dataIn, writeEn, readEn, dataOut); //FIFO_DEPTH = ADDR_WIDTH^2 parameter FIFO_WIDTH = 8; parameter FIFO_DEPTH = 64; parameter ADDR_WIDTH = 6; input clk; input [FIFO_WIDTH-1:0] dataIn; output [FIFO_WIDTH-1:0] dataOut; input writeEn; input readEn; input [ADDR_WIDTH-1:0] addrIn; input [ADDR_WIDTH-1:0] addrOut; wire clk; wire [FIFO_WIDTH-1:0] dataIn; reg [FIFO_WIDTH-1:0] dataOut; wire writeEn; wire readEn; wire [ADDR_WIDTH-1:0] addrIn; wire [ADDR_WIDTH-1:0] addrOut; reg [FIFO_WIDTH-1:0] buffer [0:FIFO_DEPTH-1]; // synchronous read. Introduces one clock cycle delay always @(posedge clk) begin dataOut <= buffer[addrOut]; end // synchronous write always @(posedge clk) begin if (writeEn == 1'b1) buffer[addrIn] <= dataIn; end endmodule
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