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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  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 $

// Revision 1.2  2005/12/16 06:44:16  Administrator

// replaced tab with space.

// passed 9.6k length frame test.

//

// Revision 1.1.1.1  2005/12/13 01:51:45  Administrator

// no message

//    

module Broadcast_filter (

Reset                   ,

Clk                     ,

//MAC_rx_ctrl           ,

broadcast_ptr           ,

broadcast_drop          ,

//FromCPU               ,

broadcast_filter_en     ,

broadcast_bucket_depth    ,

broadcast_bucket_interval

);

input           Reset                       ;

input           Clk                         ;

                //MAC_rx_ctrl               

input           broadcast_ptr               ;

output          broadcast_drop              ;

                //FromCPU                   ;

input           broadcast_filter_en         ;

input   [15:0]  broadcast_bucket_depth      ;

input   [15:0]  broadcast_bucket_interval   ;

//******************************************************************************  

//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 if (time_counter==broadcast_bucket_interval)

        time_counter    <=0;

    else

        time_counter    <=time_counter+1;

always @ (posedge Clk or posedge Reset)

    if (Reset)

        broadcast_counter   <=0;

    else if (time_counter==broadcast_bucket_interval)

        broadcast_counter   <=0;

    else if (broadcast_ptr&&broadcast_counter!=broadcast_bucket_depth)

        broadcast_counter   <=broadcast_counter+1;

always @ (posedge Clk or posedge Reset)

    if (Reset)

        broadcast_drop      <=0;

    else if(broadcast_filter_en&&broadcast_counter==broadcast_bucket_depth)

        broadcast_drop      <=1;

    else

        broadcast_drop      <=0;

endmodule