git.gag.com Git - debian/gnuradio/blob - usrp2/fpga/eth/rtl/verilog/MAC_rx/Broadcast_filter.v

   1 //////////////////////////////////////////////////////////////////////\r
   2 ////                                                              ////\r
   3 ////  Broadcast_filter.v                                          ////\r
   4 ////                                                              ////\r
   5 ////  This file is part of the Ethernet IP core project           ////\r
   6 ////  http://www.opencores.org/projects.cgi/web/ethernet_tri_mode/////\r
   7 ////                                                              ////\r
   8 ////  Author(s):                                                  ////\r
   9 ////      - Jon Gao (gaojon@yahoo.com)                            ////\r
  10 ////                                                              ////\r
  11 ////                                                              ////\r
  12 //////////////////////////////////////////////////////////////////////\r
  13 ////                                                              ////\r
  14 //// Copyright (C) 2001 Authors                                   ////\r
  15 ////                                                              ////\r
  16 //// This source file may be used and distributed without         ////\r
  17 //// restriction provided that this copyright statement is not    ////\r
  18 //// removed from the file and that any derivative work contains  ////\r
  19 //// the original copyright notice and the associated disclaimer. ////\r
  20 ////                                                              ////\r
  21 //// This source file is free software; you can redistribute it   ////\r
  22 //// and/or modify it under the terms of the GNU Lesser General   ////\r
  23 //// Public License as published by the Free Software Foundation; ////\r
  24 //// either version 2.1 of the License, or (at your option) any   ////\r
  25 //// later version.                                               ////\r
  26 ////                                                              ////\r
  27 //// This source is distributed in the hope that it will be       ////\r
  28 //// useful, but WITHOUT ANY WARRANTY; without even the implied   ////\r
  29 //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////\r
  30 //// PURPOSE.  See the GNU Lesser General Public License for more ////\r
  31 //// details.                                                     ////\r
  32 ////                                                              ////\r
  33 //// You should have received a copy of the GNU Lesser General    ////\r
  34 //// Public License along with this source; if not, download it   ////\r
  35 //// from http://www.opencores.org/lgpl.shtml                     ////\r
  36 ////                                                              ////\r
  37 //////////////////////////////////////////////////////////////////////\r
  38 //                                                                    \r
  39 // CVS Revision History                                               \r
  40 //                                                                    \r
  41 // $Log: Broadcast_filter.v,v $\r
  42 // Revision 1.3  2006/01/19 14:07:54  maverickist\r
  43 // verification is complete.\r
  44 //\r
  45 // Revision 1.2  2005/12/16 06:44:16  Administrator\r
  46 // replaced tab with space.\r
  47 // passed 9.6k length frame test.\r
  48 //\r
  49 // Revision 1.1.1.1  2005/12/13 01:51:45  Administrator\r
  50 // no message\r
  51 //    \r
  52 \r
  53 module Broadcast_filter (    \r
  54 Reset                   ,\r
  55 Clk                     ,\r
  56 //MAC_rx_ctrl           ,\r
  57 broadcast_ptr           ,\r
  58 broadcast_drop          ,\r
  59 //FromCPU               ,\r
  60 broadcast_filter_en     ,\r
  61 broadcast_bucket_depth    ,\r
  62 broadcast_bucket_interval \r
  63 );\r
  64 input           Reset                       ;\r
  65 input           Clk                         ;\r
  66                 //MAC_rx_ctrl               \r
  67 input           broadcast_ptr               ;\r
  68 output          broadcast_drop              ;\r
  69                 //FromCPU                   ;\r
  70 input           broadcast_filter_en         ;\r
  71 input   [15:0]  broadcast_bucket_depth      ;\r
  72 input   [15:0]  broadcast_bucket_interval   ;\r
  73 \r
  74 //******************************************************************************  \r
  75 //internal signals                                                                \r
  76 //******************************************************************************  \r
  77 reg     [15:0]  time_counter            ;\r
  78 reg     [15:0]  broadcast_counter        ;\r
  79 reg             broadcast_drop          ;\r
  80 //******************************************************************************  \r
  81 //                                                               \r
  82 //****************************************************************************** \r
  83 always @ (posedge Clk or posedge Reset)\r
  84     if (Reset)\r
  85         time_counter    <=0;\r
  86     else if (time_counter==broadcast_bucket_interval)\r
  87         time_counter    <=0;\r
  88     else\r
  89         time_counter    <=time_counter+1;\r
  90 \r
  91 always @ (posedge Clk or posedge Reset)\r
  92     if (Reset)\r
  93         broadcast_counter   <=0;\r
  94     else if (time_counter==broadcast_bucket_interval)\r
  95         broadcast_counter   <=0;\r
  96     else if (broadcast_ptr&&broadcast_counter!=broadcast_bucket_depth)\r
  97         broadcast_counter   <=broadcast_counter+1;\r
  98                 \r
  99 always @ (posedge Clk or posedge Reset)\r
 100     if (Reset)\r
 101         broadcast_drop      <=0;\r
 102     else if(broadcast_filter_en&&broadcast_counter==broadcast_bucket_depth)\r
 103         broadcast_drop      <=1;\r
 104     else\r
 105         broadcast_drop      <=0;\r
 106 \r
 107 endmodule