Subversion Repositories ethmac

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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/                   ////

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////  Author(s):                                                  ////

////      - Igor Mohor (igorM@opencores.org)                      ////

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////  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         ////

//// 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                     ////

////                                                              ////

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//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// 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.