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//// simFifoMem.v                                                 ////

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//// This file is part of the usbhostslave opencores effort.

//// <http://www.opencores.org/cores//>                           ////

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//// Module Description:                                          ////

//// 

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//// To Do:                                                       ////

//// 

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//// Author(s):                                                   ////

//// - Steve Fielding, sfielding@base2designs.com                 ////

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//// Copyright (C) 2004 Steve Fielding and OPENCORES.ORG          ////

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//// 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 1.2 2004-12-18 14:36:06 sfielding Exp $

//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// Revision 1.1.1.1  2004/10/11 04:00:51  sfielding

// Created

//

//

`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