Subversion Repositories usbhostslave

//////////////////////////////////////////////////////////////////////
////                                                              ////
//// rxStatusMonitor.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: rxStatusMonitor.v,v 1.1.1.1 2004-10-11 04:00:53 sfielding Exp $
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
//
module rxStatusMonitor(connectStateIn, connectStateOut, resumeDetectedIn, connectionEventOut, resumeIntOut, clk, rst);
 
input [1:0] connectStateIn;
input resumeDetectedIn;
input clk;
input rst;
output connectionEventOut;
output [1:0] connectStateOut;
output resumeIntOut;
 
wire [1:0] connectStateIn;
wire resumeDetectedIn;
reg connectionEventOut;
reg [1:0] connectStateOut;
reg resumeIntOut;
wire clk;
wire rst;
 
reg [1:0]oldConnectState;
reg oldResumeDetected;
 
always @(connectStateIn)
begin
	connectStateOut <= connectStateIn;
end
 
 
always @(posedge clk)
begin
	if (rst == 1'b1)
	begin
		oldConnectState <= connectStateIn;
		oldResumeDetected <= resumeDetectedIn;
	end
	else
	begin
		oldConnectState <= connectStateIn;
		oldResumeDetected <= resumeDetectedIn;
		if (oldConnectState != connectStateIn)
			connectionEventOut <= 1'b1;
		else
			connectionEventOut <= 1'b0;
		if (resumeDetectedIn == 1'b1 && oldResumeDetected == 1'b0)
			resumeIntOut <= 1'b1;
		else 
			resumeIntOut <= 1'b0;
	end
end
 
endmodule