public virtual void PerformOperation(InternalRequest internalReq)
{
FlashChipDie targetDie = this.Dies[internalReq.TargetPageAddress.DieID];
if (targetDie.Status != DieStatus.Idle &&
(internalReq.ExecutionType != InternalRequestExecutionType.Multiplane) &&
(internalReq.ExecutionType != InternalRequestExecutionType.InterleavedMultiplane))
{
throw new Exception("Executing operation on a busy die");
}
if (targetDie.Planes[internalReq.TargetPageAddress.PlaneID].Status == PlaneStatus.Busy)
{
throw new Exception("Executing operation on a busy plane");
}
targetDie.CurrentExecutingOperationCount++;
targetDie.Status = DieStatus.Busy;
targetDie.Planes[internalReq.TargetPageAddress.PlaneID].Status = PlaneStatus.Busy;
targetDie.Planes[internalReq.TargetPageAddress.PlaneID].CurrentExecutingRequest = internalReq;
ulong executionTime = 0;
switch (internalReq.Type)
{
case InternalRequestType.Read:
this.Status = FlashChipStatus.Reading;
/* tR + tRR
* According to micron's manual, after read operation accomplishment, we have to wait for ready signals to be driven*/
executionTime = readLatency + readDataOutputReadyTime;
break;
case InternalRequestType.Write:
this.Status = FlashChipStatus.Writing;
executionTime = programLatency;
break;
case InternalRequestType.Clean:
this.Status = FlashChipStatus.Erasing;
executionTime = eraseLatency; //This is a normal erase requeset
break;
default:
throw new Exception("Unhandled operation type");
}
internalReq.ExpectedFinishTime = XEngineFactory.XEngine.Time + executionTime;
internalReq.FlashChipExecutionEvent = new XEvent(internalReq.ExpectedFinishTime, this, internalReq, 0);
XEngineFactory.XEngine.EventList.InsertXEvent(internalReq.FlashChipExecutionEvent);
CurrentExecutingOperationCount++;
if (CurrentExecutingOperationCount == 1)
{
ThisRoundExecutionStart = XEngineFactory.XEngine.Time;
ThisRoundExecutionFinish = ulong.MaxValue;
ExpectedFinishTime = internalReq.ExpectedFinishTime;
IssueTimeOfExecutingRequest = internalReq.IssueTime;
}
}
public FlashChip(
string id,
uint channelID,
uint localChipID,
uint overallChipID,
uint dieNo,
uint PlaneNoPerDie,
uint BlockNoPerPlane,
uint PageNoPerBlock,
uint BlockEraseLimit,
ulong readLatency,
ulong programLatency,
ulong eraseLatency,
ulong readDataOutputReadyTime
) : base(id)
{
this.ChannelID = channelID;
this.LocalChipID = localChipID;
this.OverallChipID = overallChipID;
this.CurrentActiveDieID = 0;
this.PlaneNoPerDie = PlaneNoPerDie;
this.BlockNoPerPlane = BlockNoPerPlane;
this.PageNoPerBlock = PageNoPerBlock;
this.BlockEraseLimit = BlockEraseLimit;
this.Dies = new FlashChipDie[dieNo];
for (uint dieID = 0; dieID < dieNo; dieID++)
{
Dies[dieID] = new FlashChipDie(channelID, overallChipID, localChipID, dieID, PlaneNoPerDie, BlockNoPerPlane, PageNoPerBlock);
}
this.ReadCount = 0;
this.ProgamCount = 0;
this.EraseCount = 0;
this.readLatency = readLatency;
this.programLatency = programLatency;
this.eraseLatency = eraseLatency;
this.readDataOutputReadyTime = readDataOutputReadyTime;
this.Status = FlashChipStatus.Idle;
}
public override void ProcessXEvent(XEvent e)
{
if (e.Removed)
{
return;
}
//Just only one xevent: OperationFinished
InternalRequest targetRequest = e.Parameters as InternalRequest;
FlashChipDie targetDie = this.Dies[targetRequest.TargetPageAddress.DieID];
targetDie.CurrentExecutingOperationCount--;
if (targetDie.CurrentExecutingOperationCount == 0)
{
targetDie.Status = DieStatus.Idle;
}
targetDie.Planes[targetRequest.TargetPageAddress.PlaneID].Status = PlaneStatus.Idle;
targetDie.Planes[targetRequest.TargetPageAddress.PlaneID].CurrentExecutingRequest = null;
CurrentExecutingOperationCount--;
if (CurrentExecutingOperationCount == 0)
{
Status = FlashChipStatus.Idle;
totalCommandExecutionPeriod += XEngineFactory.XEngine.Time - ThisRoundExecutionStart;
ThisRoundExecutionFinish = XEngineFactory.XEngine.Time;
}
switch (targetRequest.Type)
{
case InternalRequestType.Read:
this.ReadCount++;
targetDie.Planes[targetRequest.TargetPageAddress.PlaneID].ReadCount++;
targetRequest.ExecutionTime += this.readLatency;
this.Status = FlashChipStatus.Waiting;
//Either a normal read (waiting for read data transfer) or a copyback read (waiting for write execution)
this.CurrentWaitingTransfers++;
if (targetDie.Status == DieStatus.Idle)
{
targetDie.TotalReadExecutionPeriod += readLatency;
}
break;
case InternalRequestType.Write:
this.ProgamCount++;
targetDie.Planes[targetRequest.TargetPageAddress.PlaneID].ProgamCount++;
targetRequest.ExecutionTime += this.programLatency;
if (targetDie.Status == DieStatus.Idle)
{
targetDie.TotalProgramExecutionPeriod += programLatency;
}
break;
case InternalRequestType.Clean:
this.EraseCount++;
targetDie.Planes[targetRequest.TargetPageAddress.PlaneID].EraseCount++;
targetRequest.ExecutionTime += this.eraseLatency;
FlashChipBlock targetBlock = this.Dies[targetRequest.TargetPageAddress.DieID].Planes[targetRequest.TargetPageAddress.PlaneID].Blocks[targetRequest.TargetPageAddress.BlockID];
targetDie.Planes[targetRequest.TargetPageAddress.PlaneID].FreePagesNo += (PageNoPerBlock - targetBlock.FreePageNo);
targetBlock.FreePageNo = PageNoPerBlock;
targetBlock.InvalidPageNo = 0;
targetBlock.LastWrittenPageNo = -1;
targetBlock.EraseCount++;
for (int i = 0; i < PageNoPerBlock; i++)
{
targetBlock.Pages[i].StreamID = FlashChipPage.PG_NOSTREAM;
targetBlock.Pages[i].ValidStatus = FlashChipPage.PG_FREE;
targetBlock.Pages[i].LPN = ulong.MaxValue;
}
#region UpdateFastGCData
targetDie.BlockInfoAbstract[targetBlock.BlockID].FreePageNo += PageNoPerBlock;
targetDie.BlockInfoAbstract[targetBlock.BlockID].InvalidPageNo = 0;
targetDie.BlockInfoAbstract[targetBlock.BlockID].EraseCount++;
#endregion
if (targetDie.Status == DieStatus.Idle)
{
targetDie.TotalEraseExecutionPeriod += eraseLatency;
}
break;
default:
break;
}
OnInternalRequestServiced(targetRequest);
}