[u/mrichter/AliRoot.git] / ITS / AliITSRawStreamSDD.cxx

/**************************************************************************
 * Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$*/

///////////////////////////////////////////////////////////////////////////////
///
/// This class provides access to ITS SDD digits in raw data.
///
///////////////////////////////////////////////////////////////////////////////

#include "AliITSRawStreamSDD.h"
#include "AliRawReader.h"
#include "AliLog.h"

ClassImp(AliITSRawStreamSDD)
  
const UInt_t AliITSRawStreamSDD::fgkCodeLength[8] =  {8, 18, 2, 3, 4, 5, 6, 7};

//______________________________________________________________________
AliITSRawStreamSDD::AliITSRawStreamSDD(AliRawReader* rawReader) :
  AliITSRawStream(rawReader),
fDDLModuleMap(0),
fData(0),
fEventId(0),
fCarlosId(-1),
fChannel(0),
fJitter(0),
fNCarlos(kModulesPerDDL),
fDDL(0),
fEndWords(0),
fResetSkip(0)
{
// create an object to read ITS SDD raw digits
  fDDLModuleMap=new AliITSDDLModuleMapSDD();
  fDDLModuleMap->SetDefaultMap();
  Reset();
  for(Int_t i=0;i<kFifoWords;i++) fNfifo[i]=0;
  for(Int_t i=0;i<kDDLsNumber;i++) fSkip[i]=0;
  fRawReader->Reset();
  fRawReader->Select("ITSSDD");

  for(Short_t i=0; i<kCarlosWords; i++) fICarlosWord[i]=0x30000000 + i; // 805306368+i;
  for(Short_t i=0; i<kFifoWords; i++) fIFifoWord[i]=0x30000010 + i;  // 805306384+i;
}

//______________________________________________________________________
AliITSRawStreamSDD::AliITSRawStreamSDD(const AliITSRawStreamSDD& rs) :
AliITSRawStream(rs.fRawReader),
fDDLModuleMap(rs.fDDLModuleMap),
fData(0),
fEventId(0),
fCarlosId(-1),
fChannel(0),
fJitter(0),
fNCarlos(kModulesPerDDL),
fDDL(0),
fEndWords(0),
fResetSkip(0)
{
  // copy constructor
  AliError("Copy constructor should not be used.");
}
//__________________________________________________________________________
AliITSRawStreamSDD& AliITSRawStreamSDD::operator=(const AliITSRawStreamSDD& rs) {
  // assignment operator
  if (this!=&rs) {}
  AliError("Assignment opertator should not be used.");
  return *this;
}

//______________________________________________________________________
AliITSRawStreamSDD::~AliITSRawStreamSDD(){
  if(fDDLModuleMap) delete fDDLModuleMap;
}
//______________________________________________________________________
UInt_t AliITSRawStreamSDD::ReadBits()
{
// read bits from the given channel
  UInt_t result = (fChannelData[fCarlosId][fChannel] & ((1<<fReadBits[fCarlosId][fChannel]) - 1));
  fChannelData[fCarlosId][fChannel] >>= fReadBits[fCarlosId][fChannel]; 
  fLastBit[fCarlosId][fChannel] -= fReadBits[fCarlosId][fChannel];
  return result;
}

//______________________________________________________________________
Int_t AliITSRawStreamSDD::DecompAmbra(Int_t value) const
{
  // AMBRA decompression (from 8 to 10 bit)
  
  if ((value & 0x80) == 0) {
    return value & 0x7f;
  } else if ((value & 0x40) == 0) {
    return 0x081 + ((value & 0x3f) << 1);
  } else if ((value & 0x20) == 0) {
    return 0x104 + ((value & 0x1f) << 3);
  } else {
    return 0x208 + ((value & 0x1f) << 4);
  }
  
}

//______________________________________________________________________
Bool_t AliITSRawStreamSDD::Next()
{
// read the next raw digit
// returns kFALSE if there is no digit left
// returns kTRUE and fCompletedModule=kFALSE when a digit is found
// returns kTRUE and fCompletedModule=kTRUE  when a module is completed (=3x3FFFFFFF footer words)

  fPrevModuleID = fModuleID;
  fDDL=fRawReader->GetDDLID();
  Int_t ddln = fRawReader->GetDDLID();
  if(ddln <0) ddln=0;
  fCompletedModule=kFALSE;

  while (kTRUE) {
    if(fResetSkip==0){
      Bool_t kSkip = ResetSkip(ddln);
      fResetSkip=1;
      if(!kSkip) return kSkip;
    }
  
    if ((fChannel < 0) || (fCarlosId < 0) || (fChannel >= 2) || (fCarlosId >= kModulesPerDDL) || (fLastBit[fCarlosId][fChannel] < fReadBits[fCarlosId][fChannel]) ) {
      if (!fRawReader->ReadNextInt(fData)) return kFALSE;  // read next word
      ddln = fRawReader->GetDDLID();
      if(ddln!=fDDL) { 
	Reset();
	fDDL=fRawReader->GetDDLID();
      }
      if(ddln < 0 || ddln > (kDDLsNumber-1)) ddln  = 0;

      fChannel = -1;
      if((fData >> 16) == 0x7F00){ // jitter word
	for(Int_t i=0;i<kDDLsNumber;i++){fSkip[i]=0;}
	fResetSkip=0;
	fEndWords=0;
	continue;
      }

      UInt_t nData28= fData >> 28;
      UInt_t nData30= fData >> 30;


      if (nData28== 0x02) {           // header
	fEventId = (fData >> 3) & 0x07FF; 
      } else if (nData28== 0x04) {
	// JTAG word -- do nothing
      } else if (nData28== 0x03) {    // Carlos and FIFO words or Footers
	if(fData>=fICarlosWord[0]&&fData<=fICarlosWord[11]) { // Carlos Word
	  if(fEndWords==12) continue; // out of event
	  fCarlosId = fData-fICarlosWord[0];
	  Int_t iFifoIdx = fCarlosId/3;
	  if(fNCarlos == 8) iFifoIdx=fCarlosId/2;
	  fNfifo[iFifoIdx] = fCarlosId;
	} else if (fData>=fIFifoWord[0]&&fData<=fIFifoWord[3]){ // FIFO word
	  if(fEndWords==12) continue; // out of event
	  fCarlosId = fNfifo[fData-fIFifoWord[0]];	    
	} else if(fData==0x3FFFFFFF){ // Carlos footer
	  if(fCarlosId>=0 && fCarlosId<kModulesPerDDL){
	    fICountFoot[fCarlosId]++; // stop before the last word (last word=jitter)
	    if(fICountFoot[fCarlosId]==3){
	      fCompletedModule=kTRUE;
	      //	      printf("Completed module %d DDL %d\n",fCarlosId,ddln);
	      return kTRUE;
	    }
	  }
	} else if(fData==0x3F1F1F1F){ // CarlosRX footer
	  fEndWords++;
	  if(fEndWords<=12) continue;
	}else{
	  fRawReader->AddMajorErrorLog(kDataError,"Too many footers");
	  AliWarning(Form("invalid data: too many footers\n", fData));
	  return kFALSE;	    
	}
      } else if (nData30 == 0x02 || nData30 == 0x03) {
	fChannel = nData30-2;
	if(fCarlosId>=0 && fChannel>=0 && fCarlosId <kModulesPerDDL && fChannel<2){
	  fChannelData[fCarlosId][fChannel] += 
	    (ULong64_t(fData & 0x3FFFFFFF) << fLastBit[fCarlosId][fChannel]);
	  fLastBit[fCarlosId][fChannel] += 30;
	}
      } else {                               // unknown data format
	fRawReader->AddMajorErrorLog(kDataFormatErr,Form("Invalid data %8.8x",fData));
	AliWarning(Form("invalid data: %8.8x\n", fData));
	return kFALSE;
      }
      
      if (fNCarlos == 8 && fCarlosId >= 8) continue;  // old data, fNCarlos = 8;
      if(fCarlosId>=0 && fCarlosId <kModulesPerDDL){
	 fModuleID = GetModuleNumber(ddln,fCarlosId);
      }
    } else {  // decode data
      if (fReadCode[fCarlosId][fChannel]) {// read the next code word
	fChannelCode[fCarlosId][fChannel] = ReadBits();
	fReadCode[fCarlosId][fChannel] = kFALSE;
	fReadBits[fCarlosId][fChannel] = fgkCodeLength[fChannelCode[fCarlosId][fChannel]];
      } else {                      // read the next data word
	UInt_t data = ReadBits();
	fReadCode[fCarlosId][fChannel] = kTRUE;
	fReadBits[fCarlosId][fChannel] = 3;
	if (fChannelCode[fCarlosId][fChannel] == 0) {         // set the time bin	  
	  fTimeBin[fCarlosId][fChannel] = data;
	} else if (fChannelCode[fCarlosId][fChannel] == 1) {  // next anode
	  fTimeBin[fCarlosId][fChannel] = 0;
	  fAnode[fCarlosId][fChannel]++;
	} else {                                   // ADC signal data
	  fSignal = DecompAmbra(data + (1 << fChannelCode[fCarlosId][fChannel]) + fLowThreshold[fChannel]);
	  fCoord1 = fAnode[fCarlosId][fChannel];
	  fCoord2 = fTimeBin[fCarlosId][fChannel];
	  fTimeBin[fCarlosId][fChannel]++;
	  //printf("Data read, Module=%d , Anode=%d , Time=%d , Charge=%d\n",fModuleID,fCoord1,fCoord2,fSignal);
	  return kTRUE;
	}
      }
    }
  }
  return kFALSE;
}

//______________________________________________________________________
void AliITSRawStreamSDD::Reset(){

  //reset data member for a new ddl
  for(Int_t i=0;i<2;i++){
    for(Int_t ic=0;ic<kModulesPerDDL;ic++){
      fChannelData[ic][i]=0;
      fLastBit[ic][i]=0;
      fChannelCode[ic][i]=0;
      fReadCode[ic][i]=kTRUE;
      fReadBits[ic][i]=3;
      fTimeBin[ic][i]=0;
      fAnode[ic][i]=0;     
    }
    fLowThreshold[i]=0;
  }
  for(Int_t i=0;i<kModulesPerDDL;i++) fICountFoot[i]=0;
}

//______________________________________________________________________
Bool_t AliITSRawStreamSDD::ResetSkip(Int_t ddln){
  // skip the 1 DDL header word = 0xffffffff
  Bool_t startCount=kFALSE;
  while (fSkip[ddln] < 1) {
    if (!fRawReader->ReadNextInt(fData)) { 
      return kFALSE;
    }
    if(fData==0xFFFFFFFF) startCount=kTRUE;
    //printf("%x\n",fData);
    if ((fData >> 30) == 0x01) continue;  // JTAG word
    if(startCount) fSkip[ddln]++;
  }
  return kTRUE;
}
Commit	Line	Data
2906f4c2	1	/**************************************************************************
27639c72	2	* Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
2906f4c2	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
ceb607d0	16	/* $Id$*/
2906f4c2	17
	18	///////////////////////////////////////////////////////////////////////////////
	19	///
	20	/// This class provides access to ITS SDD digits in raw data.
	21	///
	22	///////////////////////////////////////////////////////////////////////////////
	23
	24	#include "AliITSRawStreamSDD.h"
	25	#include "AliRawReader.h"
39a7c5cc	26	#include "AliLog.h"
2906f4c2	27
2906f4c2	28	ClassImp(AliITSRawStreamSDD)
1ba0280f	29
1ba0280f	30	const UInt_t AliITSRawStreamSDD::fgkCodeLength[8] = {8, 18, 2, 3, 4, 5, 6, 7};
2906f4c2	31
979b5a5f	32	//______________________________________________________________________
2906f4c2	33	AliITSRawStreamSDD::AliITSRawStreamSDD(AliRawReader* rawReader) :
e56160b8	34	AliITSRawStream(rawReader),
979b5a5f	35	fDDLModuleMap(0),
e56160b8	36	fData(0),
a97b3678	37	fEventId(0),
14dceddf	38	fCarlosId(-1),
e56160b8	39	fChannel(0),
a97b3678	40	fJitter(0),
a97b3678	41	fNCarlos(kModulesPerDDL),
27639c72	42	fDDL(0),
9c8e7d50	43	fEndWords(0),
	44	fResetSkip(0)
	45	{
2906f4c2	46	// create an object to read ITS SDD raw digits
979b5a5f	47	fDDLModuleMap=new AliITSDDLModuleMapSDD();
979b5a5f	48	fDDLModuleMap->SetDefaultMap();
27639c72	49	Reset();
765a9f95	50	for(Int_t i=0;i<kFifoWords;i++) fNfifo[i]=0;
a97b3678	51	for(Int_t i=0;i<kDDLsNumber;i++) fSkip[i]=0;
a97b3678	52	fRawReader->Reset();
362c9d61	53	fRawReader->Select("ITSSDD");
1ba0280f	54
27639c72	55	for(Short_t i=0; i<kCarlosWords; i++) fICarlosWord[i]=0x30000000 + i; // 805306368+i;
27639c72	56	for(Short_t i=0; i<kFifoWords; i++) fIFifoWord[i]=0x30000010 + i; // 805306384+i;
1ba0280f	57	}
1ba0280f	58
979b5a5f	59	//______________________________________________________________________
	60	AliITSRawStreamSDD::AliITSRawStreamSDD(const AliITSRawStreamSDD& rs) :
	61	AliITSRawStream(rs.fRawReader),
	62	fDDLModuleMap(rs.fDDLModuleMap),
	63	fData(0),
	64	fEventId(0),
	65	fCarlosId(-1),
	66	fChannel(0),
	67	fJitter(0),
	68	fNCarlos(kModulesPerDDL),
	69	fDDL(0),
	70	fEndWords(0),
	71	fResetSkip(0)
	72	{
	73	// copy constructor
	74	AliError("Copy constructor should not be used.");
	75	}
	76	//__________________________________________________________________________
	77	AliITSRawStreamSDD& AliITSRawStreamSDD::operator=(const AliITSRawStreamSDD& rs) {
	78	// assignment operator
	79	if (this!=&rs) {}
	80	AliError("Assignment opertator should not be used.");
	81	return *this;
	82	}
	83
	84	//______________________________________________________________________
	85	AliITSRawStreamSDD::~AliITSRawStreamSDD(){
	86	if(fDDLModuleMap) delete fDDLModuleMap;
	87	}
	88	//______________________________________________________________________
1ba0280f	89	UInt_t AliITSRawStreamSDD::ReadBits()
	90	{
	91	// read bits from the given channel
a97b3678	92	UInt_t result = (fChannelData[fCarlosId][fChannel] & ((1<<fReadBits[fCarlosId][fChannel]) - 1));
	93	fChannelData[fCarlosId][fChannel] >>= fReadBits[fCarlosId][fChannel];
	94	fLastBit[fCarlosId][fChannel] -= fReadBits[fCarlosId][fChannel];
1ba0280f	95	return result;
2906f4c2	96	}
2906f4c2	97
979b5a5f	98	//______________________________________________________________________
1ba0280f	99	Int_t AliITSRawStreamSDD::DecompAmbra(Int_t value) const
1ba0280f	100	{
a97b3678	101	// AMBRA decompression (from 8 to 10 bit)
a97b3678	102
1ba0280f	103	if ((value & 0x80) == 0) {
	104	return value & 0x7f;
	105	} else if ((value & 0x40) == 0) {
	106	return 0x081 + ((value & 0x3f) << 1);
	107	} else if ((value & 0x20) == 0) {
	108	return 0x104 + ((value & 0x1f) << 3);
	109	} else {
	110	return 0x208 + ((value & 0x1f) << 4);
	111	}
a97b3678	112
1ba0280f	113	}
2906f4c2	114
979b5a5f	115	//______________________________________________________________________
2906f4c2	116	Bool_t AliITSRawStreamSDD::Next()
	117	{
	118	// read the next raw digit
	119	// returns kFALSE if there is no digit left
5dfa68c5	120	// returns kTRUE and fCompletedModule=kFALSE when a digit is found
	121	// returns kTRUE and fCompletedModule=kTRUE when a module is completed (=3x3FFFFFFF footer words)
	122
2906f4c2	123	fPrevModuleID = fModuleID;
a97b3678	124	fDDL=fRawReader->GetDDLID();
	125	Int_t ddln = fRawReader->GetDDLID();
	126	if(ddln <0) ddln=0;
5dfa68c5	127	fCompletedModule=kFALSE;
a97b3678	128
a97b3678	129	while (kTRUE) {
5dfa68c5	130	if(fResetSkip==0){
	131	Bool_t kSkip = ResetSkip(ddln);
	132	fResetSkip=1;
	133	if(!kSkip) return kSkip;
	134	}
27639c72	135
8345a1cf	136	if ((fChannel < 0) \|\| (fCarlosId < 0) \|\| (fChannel >= 2) \|\| (fCarlosId >= kModulesPerDDL) \|\| (fLastBit[fCarlosId][fChannel] < fReadBits[fCarlosId][fChannel]) ) {
14dceddf	137	if (!fRawReader->ReadNextInt(fData)) return kFALSE; // read next word
a97b3678	138	ddln = fRawReader->GetDDLID();
27639c72	139	if(ddln!=fDDL) {
9c8e7d50	140	Reset();
9c8e7d50	141	fDDL=fRawReader->GetDDLID();
9c8e7d50	142	}
a97b3678	143	if(ddln < 0 \|\| ddln > (kDDLsNumber-1)) ddln = 0;
5dfa68c5	144
a97b3678	145	fChannel = -1;
c3ad350c	146	if((fData >> 16) == 0x7F00){ // jitter word
9c8e7d50	147	for(Int_t i=0;i<kDDLsNumber;i++){fSkip[i]=0;}
	148	fResetSkip=0;
	149	fEndWords=0;
5dfa68c5	150	continue;
9c8e7d50	151	}
5dfa68c5	152
14dceddf	153	UInt_t nData28= fData >> 28;
	154	UInt_t nData30= fData >> 30;
	155
	156
	157	if (nData28== 0x02) { // header
	158	fEventId = (fData >> 3) & 0x07FF;
c3ad350c	159	} else if (nData28== 0x04) {
c3ad350c	160	// JTAG word -- do nothing
14dceddf	161	} else if (nData28== 0x03) { // Carlos and FIFO words or Footers
	162	if(fData>=fICarlosWord[0]&&fData<=fICarlosWord[11]) { // Carlos Word
	163	if(fEndWords==12) continue; // out of event
	164	fCarlosId = fData-fICarlosWord[0];
	165	Int_t iFifoIdx = fCarlosId/3;
	166	if(fNCarlos == 8) iFifoIdx=fCarlosId/2;
	167	fNfifo[iFifoIdx] = fCarlosId;
	168	} else if (fData>=fIFifoWord[0]&&fData<=fIFifoWord[3]){ // FIFO word
	169	if(fEndWords==12) continue; // out of event
	170	fCarlosId = fNfifo[fData-fIFifoWord[0]];
	171	} else if(fData==0x3FFFFFFF){ // Carlos footer
8345a1cf	172	if(fCarlosId>=0 && fCarlosId<kModulesPerDDL){
	173	fICountFoot[fCarlosId]++; // stop before the last word (last word=jitter)
	174	if(fICountFoot[fCarlosId]==3){
	175	fCompletedModule=kTRUE;
	176	// printf("Completed module %d DDL %d\n",fCarlosId,ddln);
	177	return kTRUE;
	178	}
9c8e7d50	179	}
14dceddf	180	} else if(fData==0x3F1F1F1F){ // CarlosRX footer
	181	fEndWords++;
	182	if(fEndWords<=12) continue;
	183	}else{
	184	fRawReader->AddMajorErrorLog(kDataError,"Too many footers");
	185	AliWarning(Form("invalid data: too many footers\n", fData));
	186	return kFALSE;
9c8e7d50	187	}
14dceddf	188	} else if (nData30 == 0x02 \|\| nData30 == 0x03) {
14dceddf	189	fChannel = nData30-2;
8345a1cf	190	if(fCarlosId>=0 && fChannel>=0 && fCarlosId <kModulesPerDDL && fChannel<2){
	191	fChannelData[fCarlosId][fChannel] +=
	192	(ULong64_t(fData & 0x3FFFFFFF) << fLastBit[fCarlosId][fChannel]);
	193	fLastBit[fCarlosId][fChannel] += 30;
	194	}
a97b3678	195	} else { // unknown data format
9c8e7d50	196	fRawReader->AddMajorErrorLog(kDataFormatErr,Form("Invalid data %8.8x",fData));
	197	AliWarning(Form("invalid data: %8.8x\n", fData));
	198	return kFALSE;
a97b3678	199	}
a97b3678	200
14dceddf	201	if (fNCarlos == 8 && fCarlosId >= 8) continue; // old data, fNCarlos = 8;
8345a1cf	202	if(fCarlosId>=0 && fCarlosId <kModulesPerDDL){
979b5a5f	203	fModuleID = GetModuleNumber(ddln,fCarlosId);
8345a1cf	204	}
a97b3678	205	} else { // decode data
a97b3678	206	if (fReadCode[fCarlosId][fChannel]) {// read the next code word
9c8e7d50	207	fChannelCode[fCarlosId][fChannel] = ReadBits();
	208	fReadCode[fCarlosId][fChannel] = kFALSE;
	209	fReadBits[fCarlosId][fChannel] = fgkCodeLength[fChannelCode[fCarlosId][fChannel]];
a97b3678	210	} else { // read the next data word
9c8e7d50	211	UInt_t data = ReadBits();
	212	fReadCode[fCarlosId][fChannel] = kTRUE;
	213	fReadBits[fCarlosId][fChannel] = 3;
	214	if (fChannelCode[fCarlosId][fChannel] == 0) { // set the time bin
	215	fTimeBin[fCarlosId][fChannel] = data;
	216	} else if (fChannelCode[fCarlosId][fChannel] == 1) { // next anode
	217	fTimeBin[fCarlosId][fChannel] = 0;
	218	fAnode[fCarlosId][fChannel]++;
	219	} else { // ADC signal data
	220	fSignal = DecompAmbra(data + (1 << fChannelCode[fCarlosId][fChannel]) + fLowThreshold[fChannel]);
	221	fCoord1 = fAnode[fCarlosId][fChannel];
	222	fCoord2 = fTimeBin[fCarlosId][fChannel];
	223	fTimeBin[fCarlosId][fChannel]++;
14dceddf	224	//printf("Data read, Module=%d , Anode=%d , Time=%d , Charge=%d\n",fModuleID,fCoord1,fCoord2,fSignal);
9c8e7d50	225	return kTRUE;
9c8e7d50	226	}
a97b3678	227	}
	228	}
	229	}
14dceddf	230	return kFALSE;
2906f4c2	231	}
1ba0280f	232
979b5a5f	233	//______________________________________________________________________
a97b3678	234	void AliITSRawStreamSDD::Reset(){
765a9f95	235
a97b3678	236	//reset data member for a new ddl
a97b3678	237	for(Int_t i=0;i<2;i++){
	238	for(Int_t ic=0;ic<kModulesPerDDL;ic++){
	239	fChannelData[ic][i]=0;
	240	fLastBit[ic][i]=0;
	241	fChannelCode[ic][i]=0;
14dceddf	242	fReadCode[ic][i]=kTRUE;
14dceddf	243	fReadBits[ic][i]=3;
a97b3678	244	fTimeBin[ic][i]=0;
	245	fAnode[ic][i]=0;
	246	}
	247	fLowThreshold[i]=0;
	248	}
27639c72	249	for(Int_t i=0;i<kModulesPerDDL;i++) fICountFoot[i]=0;
a97b3678	250	}
765a9f95	251
979b5a5f	252	//______________________________________________________________________
765a9f95	253	Bool_t AliITSRawStreamSDD::ResetSkip(Int_t ddln){
8345a1cf	254	// skip the 1 DDL header word = 0xffffffff
5dfa68c5	255	Bool_t startCount=kFALSE;
8345a1cf	256	while (fSkip[ddln] < 1) {
27639c72	257	if (!fRawReader->ReadNextInt(fData)) {
9c8e7d50	258	return kFALSE;
9c8e7d50	259	}
5dfa68c5	260	if(fData==0xFFFFFFFF) startCount=kTRUE;
9c8e7d50	261	//printf("%x\n",fData);
765a9f95	262	if ((fData >> 30) == 0x01) continue; // JTAG word
5dfa68c5	263	if(startCount) fSkip[ddln]++;
765a9f95	264	}
	265	return kTRUE;
	266	}
	267