//
`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, 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;
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 else
if(RxStateSFD)
LatchedCrcError else
if(RxStateData[0])
LatchedCrcError end
// LatchedMRxErr
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
LatchedMRxErr else
if(MRxErr & MRxDV & (RxStatePreamble | RxStateSFD | (|RxStateData) | RxStateIdle & ~Transmitting))
LatchedMRxErr else
LatchedMRxErr end
// ReceivedPacketGood
assign ReceivedPacketGood = ~LatchedCrcError;
// ReceivedLengthOK
assign ReceivedLengthOK = RxByteCnt[15:0] >= r_MinFL[15:0] & RxByteCnt[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 else
LoadRxStatus end
// ReceiveEnd
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
ReceiveEnd else
ReceiveEnd 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 else
if(LoadRxStatus & ~SetInvalidSymbol)
InvalidSymbol else
if(SetInvalidSymbol)
InvalidSymbol end
// Late Collision
reg RxLateCollision;
reg RxColWindow;
// Collision Window
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
RxLateCollision else
if(LoadRxStatus)
RxLateCollision else
if(Collision & (~r_FullD) & (~RxColWindow | r_RecSmall))
RxLateCollision end
// Collision Window
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
RxColWindow else
if(~Collision & RxByteCnt[5:0] == CollValid[5:0] & RxStateData[1])
RxColWindow else
if(RxStateIdle)
RxColWindow end
// ShortFrame
reg ShortFrame;
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
ShortFrame else
if(LoadRxStatus)
ShortFrame else
if(TakeSample)
ShortFrame end
// DribbleNibble
reg DribbleNibble;
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
DribbleNibble else
if(RxStateSFD)
DribbleNibble else
if(~MRxDV & RxStateData[1])
DribbleNibble end
reg ReceivedPacketTooBig;
always @ (posedge MRxClk or posedge Reset)
begin
if(Reset)
ReceivedPacketTooBig else
if(LoadRxStatus)
ReceivedPacketTooBig else
if(TakeSample)
ReceivedPacketTooBig r_MaxFL[15:0];
end
// Latched Retry counter for tx status
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
RetryCntLatched else
if(StartTxDone | StartTxAbort)
RetryCntLatched end
// Latched Retransmission limit
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
RetryLimit else
if(StartTxDone | StartTxAbort)
RetryLimit end
// Latched Late Collision
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
LateCollLatched else
if(StartTxDone | StartTxAbort)
LateCollLatched end
// Latched Defer state
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
DeferLatched else
if(DeferIndication & TxUsedData)
DeferLatched else
if(TxStartFrm)
DeferLatched end
// CarrierSenseLost
always @ (posedge MTxClk or posedge Reset)
begin
if(Reset)
CarrierSenseLost else
if((StatePreamble | (|StateData)) & ~CarrierSense & ~Loopback & ~Collision & ~r_FullD)
CarrierSenseLost else
if(TxStartFrm)
CarrierSenseLost end
endmodule
