Subversion Repositories ethernet_tri_mode

//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Broadcast_filter.v                                               ////
////                                                              ////
////  This file is part of the Ethernet IP core project           ////
////  http://www.opencores.org/projects.cgi/web/ethernet_tri_mode/////
////                                                              ////
////  Author(s):                                                  ////
////      - Jon Gao (gaojon@yahoo.com)                      	  ////
////                                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2001 Authors                                   ////
////                                                              ////
//// 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//                                                                    
// CVS Revision History                                               
//                                                                    
// $Log: not supported by cvs2svn $    
 
module Broadcast_filter (    
Reset					,
Clk	                    ,
//MAC_rx_ctrl           ,
broadcast_ptr	        ,
broadcast_drop	        ,
//FromCPU	            ,
broadcast_filter_en	    ,
broadcast_MAX	        ,
 
);
input			Reset					;
input			Clk	                    ;
				//MAC_rx_ctrl
input			broadcast_ptr	        ;
output			broadcast_drop	        ;
				//FromCPU	            ;
input			broadcast_filter_en	    ;
input	[15:0]	broadcast_MAX	        ;
 
//******************************************************************************  
//internal signals                                                                
//******************************************************************************  
reg		[15:0]	time_counter	        ;
reg		[15:0]	broadcast_counter        ;
reg				broadcast_drop	        ;
//******************************************************************************  
//                                                               
//****************************************************************************** 
always @ (posedge Clk or posedge Reset)
	if (Reset)
		time_counter	<=0;
	else 
		time_counter	<=time_counter+1;
 
always @ (posedge Clk or posedge Reset)
	if (Reset)
		broadcast_counter	<=0;
	else if (time_counter==16'hffff)
		broadcast_counter	<=0;
	else if (broadcast_ptr)
		broadcast_counter	<=broadcast_counter+1;
 
always @ (posedge Clk or posedge Reset)
	if (Reset)
		broadcast_drop		<=0;
	else if(broadcast_counter>broadcast_MAX)
		broadcast_drop		<=1;
	else
		broadcast_drop		<=0;
 
endmodule