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dmitryr |
//////////////////////////////////////////////////////////////////////
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//// ////
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//// eth_rxcounters.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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//// - Novan Hartadi (novan@vlsi.itb.ac.id) ////
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//// - Mahmud Galela (mgalela@vlsi.itb.ac.id) ////
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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 1.5 2002/02/15 11:13:29 mohor
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// Format of the file changed a bit.
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//
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// Revision 1.4 2002/02/14 20:19:41 billditt
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// Modified for Address Checking,
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// addition of eth_addrcheck.v
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//
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// Revision 1.3 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 1.2 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 1.1 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 2001/06/27 21:26:19 mohor
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// Initial release of the RxEthMAC 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_rxcounters (MRxClk, Reset, MRxDV, StateIdle, StateSFD, StateData, StateDrop, StatePreamble,
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MRxDEqD, DlyCrcEn, DlyCrcCnt, Transmitting, MaxFL, r_IFG, HugEn, IFGCounterEq24,
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ByteCntEq0, ByteCntEq1, ByteCntEq2,ByteCntEq3,ByteCntEq4,ByteCntEq5, ByteCntEq6,
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ByteCntEq7, ByteCntGreat2, ByteCntSmall7, ByteCntMaxFrame, ByteCntOut
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);
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parameter Tp = 1;
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input MRxClk;
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input Reset;
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input MRxDV;
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input StateSFD;
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input [1:0] StateData;
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input MRxDEqD;
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input StateIdle;
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input StateDrop;
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input DlyCrcEn;
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input StatePreamble;
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input Transmitting;
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input HugEn;
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input [15:0] MaxFL;
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input r_IFG;
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output IFGCounterEq24; // IFG counter reaches 9600 ns (960 ns)
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output [3:0] DlyCrcCnt; // Delayed CRC counter
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output ByteCntEq0; // Byte counter = 0
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output ByteCntEq1; // Byte counter = 1
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output ByteCntEq2; // Byte counter = 2
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output ByteCntEq3; // Byte counter = 3
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output ByteCntEq4; // Byte counter = 4
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output ByteCntEq5; // Byte counter = 5
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output ByteCntEq6; // Byte counter = 6
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output ByteCntEq7; // Byte counter = 7
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output ByteCntGreat2; // Byte counter > 2
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output ByteCntSmall7; // Byte counter < 7
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output ByteCntMaxFrame; // Byte counter = MaxFL
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output [15:0] ByteCntOut; // Byte counter
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wire ResetByteCounter;
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wire IncrementByteCounter;
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wire ResetIFGCounter;
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wire IncrementIFGCounter;
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wire ByteCntMax;
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reg [15:0] ByteCnt;
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reg [3:0] DlyCrcCnt;
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reg [4:0] IFGCounter;
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wire [15:0] ByteCntDelayed;
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assign ResetByteCounter = MRxDV & (StateSFD & MRxDEqD | StateData[0] & ByteCntMaxFrame);
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assign IncrementByteCounter = ~ResetByteCounter & MRxDV &
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(StatePreamble | StateSFD | StateIdle & ~Transmitting |
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StateData[1] & ~ByteCntMax & ~(DlyCrcEn & |DlyCrcCnt)
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);
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always @ (posedge MRxClk or posedge Reset)
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begin
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if(Reset)
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ByteCnt[15:0] <= #Tp 16'h0;
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else
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begin
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if(ResetByteCounter)
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ByteCnt[15:0] <= #Tp 16'h0;
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else
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if(IncrementByteCounter)
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ByteCnt[15:0] <= #Tp ByteCnt[15:0] + 1'b1;
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end
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end
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assign ByteCntDelayed = ByteCnt + 3'h4;
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assign ByteCntOut = DlyCrcEn? ByteCntDelayed : ByteCnt;
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assign ByteCntEq0 = ByteCnt == 16'h0;
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assign ByteCntEq1 = ByteCnt == 16'h1;
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assign ByteCntEq2 = ByteCnt == 16'h2;
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assign ByteCntEq3 = ByteCnt == 16'h3;
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assign ByteCntEq4 = ByteCnt == 16'h4;
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assign ByteCntEq5 = ByteCnt == 16'h5;
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assign ByteCntEq6 = ByteCnt == 16'h6;
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assign ByteCntEq7 = ByteCnt == 16'h7;
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assign ByteCntGreat2 = ByteCnt > 16'h2;
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assign ByteCntSmall7 = ByteCnt < 16'h7;
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assign ByteCntMax = ByteCnt == 16'hffff;
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assign ByteCntMaxFrame = ByteCnt == MaxFL[15:0] & ~HugEn;
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assign ResetIFGCounter = StateSFD & MRxDV & MRxDEqD | StateDrop;
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assign IncrementIFGCounter = ~ResetIFGCounter & (StateDrop | StateIdle | StatePreamble | StateSFD) & ~IFGCounterEq24;
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always @ (posedge MRxClk or posedge Reset)
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begin
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if(Reset)
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IFGCounter[4:0] <= #Tp 5'h0;
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else
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begin
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if(ResetIFGCounter)
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IFGCounter[4:0] <= #Tp 5'h0;
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else
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if(IncrementIFGCounter)
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IFGCounter[4:0] <= #Tp IFGCounter[4:0] + 1'b1;
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end
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end
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assign IFGCounterEq24 = (IFGCounter[4:0] == 5'h18) | r_IFG; // 24*400 = 9600 ns or r_IFG is set to 1
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always @ (posedge MRxClk or posedge Reset)
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begin
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if(Reset)
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DlyCrcCnt[3:0] <= #Tp 4'h0;
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else
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begin
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if(DlyCrcCnt[3:0] == 4'h9)
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DlyCrcCnt[3:0] <= #Tp 4'h0;
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else
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if(DlyCrcEn & StateSFD)
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DlyCrcCnt[3:0] <= #Tp 4'h1;
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else
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if(DlyCrcEn & (|DlyCrcCnt[3:0]))
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DlyCrcCnt[3:0] <= #Tp DlyCrcCnt[3:0] + 1'b1;
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end
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end
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endmodule
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