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OpenFPGA/openfpga_flow/benchmarks/iwls2005/ethernet/rtl/eth_macstatus.v

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//////////////////////////////////////////////////////////////////////
//// ////
//// eth_macstatus.v ////
//// ////
//// This file is part of the Ethernet IP core project ////
//// http://www.opencores.org/projects/ethmac/ ////
//// ////
//// Author(s): ////
//// - Igor Mohor (igorM@opencores.org) ////
//// ////
//// All additional information is available in the Readme.txt ////
//// file. ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2001, 2002 Authors ////
//// ////
//// 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: eth_macstatus.v,v $
// Revision 1.17 2005/03/21 20:07:18 igorm
// Some small fixes + some troubles fixed.
//
// Revision 1.16 2005/02/21 10:42:11 igorm
// Defer indication fixed.
//
// Revision 1.15 2003/01/30 13:28:19 tadejm
// Defer indication changed.
//
// Revision 1.14 2002/11/22 01:57:06 mohor
// Rx Flow control fixed. CF flag added to the RX buffer descriptor. RxAbort
// synchronized.
//
// Revision 1.13 2002/11/13 22:30:58 tadejm
// Late collision is reported only when not in the full duplex.
// Sample is taken (for status) as soon as MRxDV is not valid (regardless
// of the received byte cnt).
//
// Revision 1.12 2002/09/12 14:50:16 mohor
// CarrierSenseLost bug fixed when operating in full duplex mode.
//
// Revision 1.11 2002/09/04 18:38:03 mohor
// CarrierSenseLost status is not set when working in loopback mode.
//
// Revision 1.10 2002/07/25 18:17:46 mohor
// InvalidSymbol generation changed.
//
// Revision 1.9 2002/04/22 13:51:44 mohor
// Short frame and ReceivedLengthOK were not detected correctly.
//
// Revision 1.8 2002/02/18 10:40:17 mohor
// Small fixes.
//
// Revision 1.7 2002/02/15 17:07:39 mohor
// Status was not written correctly when frames were discarted because of
// address mismatch.
//
// Revision 1.6 2002/02/11 09:18:21 mohor
// Tx status is written back to the BD.
//
// Revision 1.5 2002/02/08 16:21:54 mohor
// Rx status is written back to the BD.
//
// Revision 1.4 2002/01/23 10:28:16 mohor
// Link in the header changed.
//
// Revision 1.3 2001/10/19 08:43:51 mohor
// eth_timescale.v changed to timescale.v This is done because of the
// simulation of the few cores in a one joined project.
//
// Revision 1.2 2001/09/11 14:17:00 mohor
// Few little NCSIM warnings fixed.
//
// Revision 1.1 2001/08/06 14:44:29 mohor
// A define FPGA added to select between Artisan RAM (for ASIC) and Block Ram (For Virtex).
// Include files fixed to contain no path.
// File names and module names changed ta have a eth_ prologue in the name.
// File eth_timescale.v is used to define timescale
// All pin names on the top module are changed to contain _I, _O or _OE at the end.
// Bidirectional signal MDIO is changed to three signals (Mdc_O, Mdi_I, Mdo_O
// and Mdo_OE. The bidirectional signal must be created on the top level. This
// is done due to the ASIC tools.
//
// Revision 1.1 2001/07/30 21:23:42 mohor
// Directory structure changed. Files checked and joind together.
//
//
//
//
//
`include "timescale.v"
module eth_macstatus(
MRxClk, Reset, ReceivedLengthOK, ReceiveEnd, ReceivedPacketGood, RxCrcError,
MRxErr, MRxDV, RxStateSFD, RxStateData, RxStatePreamble, RxStateIdle, Transmitting,
RxByteCnt, RxByteCntEq0, RxByteCntGreat2, RxByteCntMaxFrame,
InvalidSymbol, MRxD, LatchedCrcError, Collision, CollValid, RxLateCollision,
r_RecSmall, r_MinFL, r_MaxFL, ShortFrame, DribbleNibble, ReceivedPacketTooBig, r_HugEn,
LoadRxStatus, StartTxDone, StartTxAbort, RetryCnt, RetryCntLatched, MTxClk, MaxCollisionOccured,
RetryLimit, LateCollision, LateCollLatched, DeferIndication, DeferLatched, RstDeferLatched, TxStartFrm,
StatePreamble, StateData, CarrierSense, CarrierSenseLost, TxUsedData, LatchedMRxErr, Loopback,
r_FullD
);
parameter Tp = 1;
input MRxClk;
input Reset;
input RxCrcError;
input MRxErr;
input MRxDV;
input RxStateSFD;
input [1:0] RxStateData;
input RxStatePreamble;
input RxStateIdle;
input Transmitting;
input [15:0] RxByteCnt;
input RxByteCntEq0;
input RxByteCntGreat2;
input RxByteCntMaxFrame;
input [3:0] MRxD;
input Collision;
input [5:0] CollValid;
input r_RecSmall;
input [15:0] r_MinFL;
input [15:0] r_MaxFL;
input r_HugEn;
input StartTxDone;
input StartTxAbort;
input [3:0] RetryCnt;
input MTxClk;
input MaxCollisionOccured;
input LateCollision;
input DeferIndication;
input TxStartFrm;
input StatePreamble;
input [1:0] StateData;
input CarrierSense;
input TxUsedData;
input Loopback;
input r_FullD;
output ReceivedLengthOK;
output ReceiveEnd;
output ReceivedPacketGood;
output InvalidSymbol;
output LatchedCrcError;
output RxLateCollision;
output ShortFrame;
output DribbleNibble;
output ReceivedPacketTooBig;
output LoadRxStatus;
output [3:0] RetryCntLatched;
output RetryLimit;
output LateCollLatched;
output DeferLatched;
input RstDeferLatched;
output CarrierSenseLost;
output LatchedMRxErr;
reg ReceiveEnd;
reg LatchedCrcError;
reg LatchedMRxErr;
reg LoadRxStatus;
reg InvalidSymbol;
reg [3:0] RetryCntLatched;
reg RetryLimit;
reg LateCollLatched;
reg DeferLatched;
reg CarrierSenseLost;
wire TakeSample;
wire SetInvalidSymbol; // Invalid symbol was received during reception in 100Mbps
// Crc error
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
LatchedCrcError <=#Tp 1'b0;
else
if(RxStateSFD)
LatchedCrcError <=#Tp 1'b0;
else
if(RxStateData[0])
LatchedCrcError <=#Tp RxCrcError & ~RxByteCntEq0;
end
// LatchedMRxErr
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
LatchedMRxErr <=#Tp 1'b0;
else
if(MRxErr & MRxDV & (RxStatePreamble | RxStateSFD | (|RxStateData) | RxStateIdle & ~Transmitting))
LatchedMRxErr <=#Tp 1'b1;
else
LatchedMRxErr <=#Tp 1'b0;
end
// ReceivedPacketGood
assign ReceivedPacketGood = ~LatchedCrcError;
// ReceivedLengthOK
assign ReceivedLengthOK = RxByteCnt[15:0] >= r_MinFL[15:0] & RxByteCnt[15:0] <= r_MaxFL[15:0];
// Time to take a sample
//assign TakeSample = |RxStateData & ~MRxDV & RxByteCntGreat2 |
assign TakeSample = (|RxStateData) & (~MRxDV) |
RxStateData[0] & MRxDV & RxByteCntMaxFrame;
// LoadRxStatus
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
LoadRxStatus <=#Tp 1'b0;
else
LoadRxStatus <=#Tp TakeSample;
end
// ReceiveEnd
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
ReceiveEnd <=#Tp 1'b0;
else
ReceiveEnd <=#Tp LoadRxStatus;
end
// Invalid Symbol received during 100Mbps mode
assign SetInvalidSymbol = MRxDV & MRxErr & MRxD[3:0] == 4'he;
// InvalidSymbol
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
InvalidSymbol <=#Tp 1'b0;
else
if(LoadRxStatus & ~SetInvalidSymbol)
InvalidSymbol <=#Tp 1'b0;
else
if(SetInvalidSymbol)
InvalidSymbol <=#Tp 1'b1;
end
// Late Collision
reg RxLateCollision;
reg RxColWindow;
// Collision Window
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
RxLateCollision <=#Tp 1'b0;
else
if(LoadRxStatus)
RxLateCollision <=#Tp 1'b0;
else
if(Collision & (~r_FullD) & (~RxColWindow | r_RecSmall))
RxLateCollision <=#Tp 1'b1;
end
// Collision Window
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
RxColWindow <=#Tp 1'b1;
else
if(~Collision & RxByteCnt[5:0] == CollValid[5:0] & RxStateData[1])
RxColWindow <=#Tp 1'b0;
else
if(RxStateIdle)
RxColWindow <=#Tp 1'b1;
end
// ShortFrame
reg ShortFrame;
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
ShortFrame <=#Tp 1'b0;
else
if(LoadRxStatus)
ShortFrame <=#Tp 1'b0;
else
if(TakeSample)
ShortFrame <=#Tp RxByteCnt[15:0] < r_MinFL[15:0];
end
// DribbleNibble
reg DribbleNibble;
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
DribbleNibble <=#Tp 1'b0;
else
if(RxStateSFD)
DribbleNibble <=#Tp 1'b0;
else
if(~MRxDV & RxStateData[1])
DribbleNibble <=#Tp 1'b1;
end
reg ReceivedPacketTooBig;
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
ReceivedPacketTooBig <=#Tp 1'b0;
else
if(LoadRxStatus)
ReceivedPacketTooBig <=#Tp 1'b0;
else
if(TakeSample)
ReceivedPacketTooBig <=#Tp ~r_HugEn & RxByteCnt[15:0] > r_MaxFL[15:0];
end
// Latched Retry counter for tx status
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
RetryCntLatched <=#Tp 4'h0;
else
if(StartTxDone | StartTxAbort)
RetryCntLatched <=#Tp RetryCnt;
end
// Latched Retransmission limit
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
RetryLimit <=#Tp 1'h0;
else
if(StartTxDone | StartTxAbort)
RetryLimit <=#Tp MaxCollisionOccured;
end
// Latched Late Collision
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
LateCollLatched <=#Tp 1'b0;
else
if(StartTxDone | StartTxAbort)
LateCollLatched <=#Tp LateCollision;
end
// Latched Defer state
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
DeferLatched <=#Tp 1'b0;
else
if(DeferIndication)
DeferLatched <=#Tp 1'b1;
else
if(RstDeferLatched)
DeferLatched <=#Tp 1'b0;
end
// CarrierSenseLost
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
CarrierSenseLost <=#Tp 1'b0;
else
if((StatePreamble | (|StateData)) & ~CarrierSense & ~Loopback & ~Collision & ~r_FullD)
CarrierSenseLost <=#Tp 1'b1;
else
if(TxStartFrm)
CarrierSenseLost <=#Tp 1'b0;
end
endmodule
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