todo

sopc builder 中网络的eth_ocm核

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////  TODO                                                        ////
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////  This file is part of the Ethernet IP core project           ////
////  http://www.opencores.org/projects/ethmac/                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Igor Mohor ([e-mail])                      ////
////                                                              ////
////  All additional information is available in the Readme.txt   ////
////  file.                                                       ////
////                                                              ////
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//// Copyright (C) 2001, 2002 Authors                             ////
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//// This source file may be used and distributed without         ////
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//// 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.                                               ////
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//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
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//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: TODO,v $
// Revision 1.3  2003/01/23 09:14:12  mohor
// Fix MTxErr or prevent sending too big frames.
//
// Revision 1.2  2002/11/21 00:33:32  mohor
// In loopback rx_clk is not looped back. Possible CRC error. Consider if usage
// of additional logic is necessery (FIFO for looping the data).
//
// Revision 1.1  2002/09/10 10:42:06  mohor
// HASH improvement needed.
//


- Add logic for easier use of the HASH table: First write MAC address to some
  register. Then issue a command. CRC is calculated from this MAC and appropriate
  bit written to the HASH register.
  
- In loopback rx_clk is not looped back. Possible CRC error. Consider if usage of
  additional logic is necessery (FIFO for looping the data).

- When sending frames bigger than MaxFL, MaxFL is sent, BD marked as finished, 
  TxB_IRQ interrupt is set and MTxErr is set for a short period. Fix MTxErr or 
  prevent sending too big frames or set TxE_IRQ instead.