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//////////////////////////////////////////////////////////////////////
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//// ////
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//// eth_transmitcontrol.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/ethmac/ ////
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//// ////
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//// Author(s): ////
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//// - Igor Mohor (igorM@opencores.org) ////
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//// ////
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//// All additional information is avaliable in the Readme.txt ////
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//// file. ////
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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: not supported by cvs2svn $
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// Revision 1.6 2002/11/21 00:16:14 mohor
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// When TxUsedData and CtrlMux occur at the same time, byte counter needs
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// to be incremented by 2. Signal IncrementByteCntBy2 added for that reason.
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//
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// Revision 1.5 2002/11/19 17:37:32 mohor
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// When control frame (PAUSE) was sent, status was written in the
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// eth_wishbone module and both TXB and TXC interrupts were set. Fixed.
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// Only TXC interrupt is set.
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//
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// Revision 1.4 2002/01/23 10:28:16 mohor
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// Link in the header changed.
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//
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// Revision 1.3 2001/10/19 08:43:51 mohor
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// eth_timescale.v changed to timescale.v This is done because of the
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// simulation of the few cores in a one joined project.
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//
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// Revision 1.2 2001/09/11 14:17:00 mohor
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// Few little NCSIM warnings fixed.
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//
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// Revision 1.1 2001/08/06 14:44:29 mohor
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// A define FPGA added to select between Artisan RAM (for ASIC) and Block Ram (For Virtex).
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// Include files fixed to contain no path.
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// File names and module names changed ta have a eth_ prologue in the name.
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// File eth_timescale.v is used to define timescale
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// All pin names on the top module are changed to contain _I, _O or _OE at the end.
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// Bidirectional signal MDIO is changed to three signals (Mdc_O, Mdi_I, Mdo_O
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// and Mdo_OE. The bidirectional signal must be created on the top level. This
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// is done due to the ASIC tools.
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//
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// Revision 1.1 2001/07/30 21:23:42 mohor
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// Directory structure changed. Files checked and joind together.
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//
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// Revision 1.1 2001/07/03 12:51:54 mohor
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// Initial release of the MAC Control module.
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//
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//
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//
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//
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//
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//
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`include "timescale.v"
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module eth_transmitcontrol (MTxClk, TxReset, TxUsedDataIn, TxUsedDataOut, TxDoneIn, TxAbortIn,
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TxStartFrmIn, TPauseRq, TxUsedDataOutDetected, TxFlow, DlyCrcEn,
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TxPauseTV, MAC, TxCtrlStartFrm, TxCtrlEndFrm, SendingCtrlFrm, CtrlMux,
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ControlData, WillSendControlFrame, BlockTxDone
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);
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parameter Tp = 1;
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input MTxClk;
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input TxReset;
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input TxUsedDataIn;
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input TxUsedDataOut;
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input TxDoneIn;
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input TxAbortIn;
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input TxStartFrmIn;
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input TPauseRq;
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input TxUsedDataOutDetected;
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input TxFlow;
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input DlyCrcEn;
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input [15:0] TxPauseTV;
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input [47:0] MAC;
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output TxCtrlStartFrm;
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output TxCtrlEndFrm;
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output SendingCtrlFrm;
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output CtrlMux;
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output [7:0] ControlData;
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output WillSendControlFrame;
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output BlockTxDone;
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reg SendingCtrlFrm;
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reg CtrlMux;
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reg WillSendControlFrame;
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reg [3:0] DlyCrcCnt;
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reg [5:0] ByteCnt;
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reg ControlEnd_q;
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reg [7:0] MuxedCtrlData;
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reg TxCtrlStartFrm;
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reg TxCtrlStartFrm_q;
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reg TxCtrlEndFrm;
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reg [7:0] ControlData;
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reg TxUsedDataIn_q;
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reg BlockTxDone;
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wire IncrementDlyCrcCnt;
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wire ResetByteCnt;
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wire IncrementByteCnt;
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wire ControlEnd;
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wire IncrementByteCntBy2;
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wire EnableCnt;
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// A command for Sending the control frame is active (latched)
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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WillSendControlFrame <= #Tp 1'b0;
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else
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if(TxCtrlEndFrm & CtrlMux)
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WillSendControlFrame <= #Tp 1'b0;
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else
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if(TPauseRq & TxFlow)
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WillSendControlFrame <= #Tp 1'b1;
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end
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// Generation of the transmit control packet start frame
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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TxCtrlStartFrm <= #Tp 1'b0;
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else
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if(TxUsedDataIn_q & CtrlMux)
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TxCtrlStartFrm <= #Tp 1'b0;
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else
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if(WillSendControlFrame & ~TxUsedDataOut & (TxDoneIn | TxAbortIn | TxStartFrmIn | (~TxUsedDataOutDetected)))
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TxCtrlStartFrm <= #Tp 1'b1;
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end
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// Generation of the transmit control packet end frame
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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TxCtrlEndFrm <= #Tp 1'b0;
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else
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if(ControlEnd | ControlEnd_q)
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TxCtrlEndFrm <= #Tp 1'b1;
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else
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TxCtrlEndFrm <= #Tp 1'b0;
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end
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// Generation of the multiplexer signal (controls muxes for switching between
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// normal and control packets)
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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CtrlMux <= #Tp 1'b0;
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else
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if(WillSendControlFrame & ~TxUsedDataOut)
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CtrlMux <= #Tp 1'b1;
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else
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if(TxDoneIn)
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CtrlMux <= #Tp 1'b0;
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end
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// Generation of the Sending Control Frame signal (enables padding and CRC)
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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SendingCtrlFrm <= #Tp 1'b0;
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else
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if(WillSendControlFrame & TxCtrlStartFrm)
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SendingCtrlFrm <= #Tp 1'b1;
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else
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if(TxDoneIn)
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SendingCtrlFrm <= #Tp 1'b0;
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end
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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TxUsedDataIn_q <= #Tp 1'b0;
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else
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TxUsedDataIn_q <= #Tp TxUsedDataIn;
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end
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// Generation of the signal that will block sending the Done signal to the eth_wishbone module
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// While sending the control frame
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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BlockTxDone <= #Tp 1'b0;
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else
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if(TxCtrlStartFrm)
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BlockTxDone <= #Tp 1'b1;
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else
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if(TxStartFrmIn)
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BlockTxDone <= #Tp 1'b0;
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end
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always @ (posedge MTxClk)
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begin
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ControlEnd_q <= #Tp ControlEnd;
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TxCtrlStartFrm_q <= #Tp TxCtrlStartFrm;
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end
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assign IncrementDlyCrcCnt = CtrlMux & TxUsedDataIn & ~DlyCrcCnt[2];
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// Delayed CRC counter
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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DlyCrcCnt <= #Tp 4'h0;
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else
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if(ResetByteCnt)
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DlyCrcCnt <= #Tp 4'h0;
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else
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if(IncrementDlyCrcCnt)
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DlyCrcCnt <= #Tp DlyCrcCnt + 1'b1;
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end
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assign ResetByteCnt = TxReset | (~TxCtrlStartFrm & (TxDoneIn | TxAbortIn));
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assign IncrementByteCnt = CtrlMux & (TxCtrlStartFrm & ~TxCtrlStartFrm_q & ~TxUsedDataIn | TxUsedDataIn & ~ControlEnd);
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assign IncrementByteCntBy2 = CtrlMux & TxCtrlStartFrm & (~TxCtrlStartFrm_q) & TxUsedDataIn; // When TxUsedDataIn and CtrlMux are set at the same time
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assign EnableCnt = (~DlyCrcEn | DlyCrcEn & (&DlyCrcCnt[1:0]));
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// Byte counter
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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ByteCnt <= #Tp 6'h0;
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else
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if(ResetByteCnt)
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ByteCnt <= #Tp 6'h0;
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else
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if(IncrementByteCntBy2 & EnableCnt)
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ByteCnt <= #Tp (ByteCnt[5:0] ) + 2'h2;
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else
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if(IncrementByteCnt & EnableCnt)
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ByteCnt <= #Tp (ByteCnt[5:0] ) + 1'b1;
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end
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assign ControlEnd = ByteCnt[5:0] == 6'h22;
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// Control data generation (goes to the TxEthMAC module)
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always @ (ByteCnt or DlyCrcEn or MAC or TxPauseTV or DlyCrcCnt)
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begin
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case(ByteCnt)
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6'h0: if(~DlyCrcEn | DlyCrcEn & (&DlyCrcCnt[1:0]))
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MuxedCtrlData[7:0] = 8'h01; // Reserved Multicast Address
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else
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MuxedCtrlData[7:0] = 8'h0;
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6'h2: MuxedCtrlData[7:0] = 8'h80;
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6'h4: MuxedCtrlData[7:0] = 8'hC2;
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6'h6: MuxedCtrlData[7:0] = 8'h00;
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6'h8: MuxedCtrlData[7:0] = 8'h00;
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6'hA: MuxedCtrlData[7:0] = 8'h01;
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6'hC: MuxedCtrlData[7:0] = MAC[47:40];
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6'hE: MuxedCtrlData[7:0] = MAC[39:32];
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6'h10: MuxedCtrlData[7:0] = MAC[31:24];
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6'h12: MuxedCtrlData[7:0] = MAC[23:16];
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6'h14: MuxedCtrlData[7:0] = MAC[15:8];
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6'h16: MuxedCtrlData[7:0] = MAC[7:0];
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6'h18: MuxedCtrlData[7:0] = 8'h88; // Type/Length
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6'h1A: MuxedCtrlData[7:0] = 8'h08;
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6'h1C: MuxedCtrlData[7:0] = 8'h00; // Opcode
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6'h1E: MuxedCtrlData[7:0] = 8'h01;
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6'h20: MuxedCtrlData[7:0] = TxPauseTV[15:8]; // Pause timer value
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6'h22: MuxedCtrlData[7:0] = TxPauseTV[7:0];
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default: MuxedCtrlData[7:0] = 8'h0;
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endcase
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end
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// Latched Control data
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always @ (posedge MTxClk or posedge TxReset)
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begin
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if(TxReset)
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ControlData[7:0] <= #Tp 8'h0;
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else
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if(~ByteCnt[0])
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ControlData[7:0] <= #Tp MuxedCtrlData[7:0];
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end
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endmodule
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