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ghutchis |
//////////////////////////////////////////////////////////////////////
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//// ////
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//// Broadcast_filter.v ////
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//// ////
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//// This file is part of the Ethernet IP core project ////
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//// http://www.opencores.org/projects.cgi/web/ethernet_tri_mode/////
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//// ////
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//// Author(s): ////
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//// - Jon Gao (gaojon@yahoo.com) ////
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//// ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2001 Authors ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS Revision History
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//
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// $Log: Broadcast_filter.v,v $
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// Revision 1.3 2006/01/19 14:07:54 maverickist
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// verification is complete.
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//
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// Revision 1.2 2005/12/16 06:44:16 Administrator
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// replaced tab with space.
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// passed 9.6k length frame test.
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//
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// Revision 1.1.1.1 2005/12/13 01:51:45 Administrator
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// no message
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//
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module Broadcast_filter (
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Reset ,
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Clk ,
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//MAC_rx_ctrl ,
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broadcast_ptr ,
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broadcast_drop ,
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//FromCPU ,
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broadcast_filter_en ,
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broadcast_bucket_depth ,
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broadcast_bucket_interval
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);
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input Reset ;
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input Clk ;
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//MAC_rx_ctrl
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input broadcast_ptr ;
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output broadcast_drop ;
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//FromCPU ;
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input broadcast_filter_en ;
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input [15:0] broadcast_bucket_depth ;
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input [15:0] broadcast_bucket_interval ;
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//******************************************************************************
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//internal signals
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//******************************************************************************
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reg [15:0] time_counter ;
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reg [15:0] broadcast_counter ;
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reg broadcast_drop ;
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//******************************************************************************
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//
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//******************************************************************************
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always @ (posedge Clk or posedge Reset)
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if (Reset)
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time_counter <=0;
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else if (time_counter==broadcast_bucket_interval)
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time_counter <=0;
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else
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time_counter <=time_counter+1;
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always @ (posedge Clk or posedge Reset)
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if (Reset)
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broadcast_counter <=0;
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else if (time_counter==broadcast_bucket_interval)
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broadcast_counter <=0;
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else if (broadcast_ptr&&broadcast_counter!=broadcast_bucket_depth)
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broadcast_counter <=broadcast_counter+1;
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always @ (posedge Clk or posedge Reset)
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if (Reset)
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broadcast_drop <=0;
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else if(broadcast_filter_en&&broadcast_counter==broadcast_bucket_depth)
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broadcast_drop <=1;
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else
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broadcast_drop <=0;
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endmodule
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