grl pcie base gen 3 moi for tektronix 8gbps physical layer … base gen3 receiver... · 2016. 5....

GRL-PCIE3-RXMOIandUserGuide Rev.1.2.0©GraniteRiverLabs2016 Page1of87

GRLPCIeBaseGen3MOIforTektronix8GbpsPhysicalLayerTestSuite


TABLEOFCONTENTS

1 INTRODUCTION 92 REFERENCEDOCUMENTS 93 RESOURCEREQUIREMENTS 103.1 EQUIPMENTREQUIREMENTS....................................................................................................................103.2 SOFTWAREREQUIREMENTS......................................................................................................................10

4 CALIBRATION 114.1 CALIBRATIONPROCESSCONNECTIONSETUPS........................................................................................114.1.1 CalibrationforTP1.......................................................................................................................114.1.2 CalibrationforTP2.......................................................................................................................12

5 SOFTWARE 125.1 SETUP............................................................................................................................................................125.1.1 LaunchandSetupSoftware......................................................................................................135.1.2 AdditionalNotes............................................................................................................................19

5.2 CALIBRATINGUSINGTHESOFTWARE.......................................................................................................195.2.1 SessionInfo......................................................................................................................................195.2.2 ConditionsforTestingandCalibration................................................................................205.2.3 SetupConfiguration.....................................................................................................................205.2.4 SelectingCalibrationStepsUsingtheSoftware...............................................................245.2.5 RunCalibrationSteps..................................................................................................................24

5.3 TESTINGUSINGGRL-PCIE3-BASE-RXSOFTWARE............................................................................255.3.1 ReceiverComplianceTests.......................................................................................................255.3.2 ReceiverMarginTests.................................................................................................................25

5.4 REPORT.........................................................................................................................................................255.5 INTERPRETINGAREPORT..........................................................................................................................265.5.1 DUTInformation............................................................................................................................265.5.2 SummaryTable..............................................................................................................................275.5.3 CalibrationDataResults.............................................................................................................285.5.4 ComplianceTestResults............................................................................................................295.5.5 JitterMarginResults....................................................................................................................30

6 TESTSUITE 307 APPENDIXA:ARTEKCLE1000-A2INSTALLATION 307.1 ISIGENERATORDRIVERINSTALLATION..................................................................................................307.2 CLE1000GUIINSTALLATION.................................................................................................................33

8 APPENDIX B: BERT SCOPEISITRACEBOARD 34


9 APPENDIXC:MANUALTESTMETHODS 359.1 WAVEFORMTESTS......................................................................................................................................359.1.1 PreshootandDeemphasis.........................................................................................................359.1.2 LaunchAmplitude.........................................................................................................................409.1.3 AmplitudeEqualization..............................................................................................................409.1.4 RJCalibration..................................................................................................................................419.1.5 SJCalibration...................................................................................................................................45

9.2 CHANNELCALIBRATIONTESTS(TP2)....................................................................................................499.2.1 ChannelCalibrationInsertionLoss.......................................................................................499.2.2 ChannelCalibrationDifferentialModeSinusoidalInterference...............................569.2.3 ChannelCalibrationACCommonModeSinusoidalInterference.............................58

9.3 CALIBRATIONATTP2P..............................................................................................................................599.3.1 TP2PStressedVoltageCalibration........................................................................................609.3.2 StressedJitterCalibration(ForLongChannelOnly).....................................................68

9.4 RECEIVERTEST...........................................................................................................................................759.4.1 EquipmentSetup...........................................................................................................................759.4.2 StressedVoltageReceiverTest...............................................................................................769.4.3 StressedJitterReceiverTest(100MHz)..............................................................................79

10 PVTAUTOMATION 8210.1 AVAILABLEPARAMETERS......................................................................................................................8210.2 APPLICABLETESTS.................................................................................................................................8210.3 SETTINGUPPVTVALUESEQUENCES..................................................................................................8310.4 SEARCHALGORITHM..............................................................................................................................8610.4.1 JitterMarginTesting................................................................................................................86

10.5 TESTRESULTS..........................................................................................................................................8610.6 SAVINGANDLOADINGAPVTSESSION................................................................................................87


ListofFiguresFigure1.TypicalSetupforTP1Calibration........................................................................................................11Figure2.TypicalSetupforTP2Calibration........................................................................................................12Figure3.RemoteClientWindow.............................................................................................................................13Figure4.GRLAutomatedTestSolutionsinStartMenu.................................................................................14Figure5.RxTestSolutionsinGRLAutomatedTestSolutionsWindow.................................................14Figure6.LicenseDetailsWindow...........................................................................................................................15Figure7.OpenChoiceInstrumentManagerinStartMenu...........................................................................16Figure8.InstrumentListinInstrumentManager............................................................................................17Figure9.EquipmentSetupWindow–View#1.................................................................................................18Figure10.EquipmentSetupWindow–View#2..............................................................................................18Figure11.EquipmentSetupWindow–View#3..............................................................................................19Figure12.SessionInfo.................................................................................................................................................19Figure13.ConditionsforTestingandCalibration...........................................................................................20Figure14.ISIGeneratorSetup..................................................................................................................................20Figure15.CustomSJFrequencies...........................................................................................................................21Figure16.ErrorCounterSetup................................................................................................................................21Figure17.LoopbackModeSetup.............................................................................................................................22Figure18.BERandMaximumErrors....................................................................................................................22Figure19.SeasimSetup...............................................................................................................................................23Figure20.ConnectionSetup......................................................................................................................................23Figure21.SelectCalibrationTestsPage...............................................................................................................24Figure22.ConnectionSetup......................................................................................................................................24Figure23.SelectComplianceTestsPage..............................................................................................................25Figure24.SelectMarginTestsPage.......................................................................................................................25Figure25.ReportResultsPage.................................................................................................................................26Figure26.DUTInformation.......................................................................................................................................26Figure27.SummaryTable..........................................................................................................................................27Figure28.CalibrationResultsExample................................................................................................................28Figure29.CalibrationResultsExample................................................................................................................29Figure30.JitterMarginReportExample.............................................................................................................30Figure31.DeviceManagerWindow......................................................................................................................31Figure32.UpdateDriverWindow..........................................................................................................................31Figure33.WindowsSecurityWindowandConfirmationWindow..........................................................32Figure34.DeviceManagerWindowafterInstallation...................................................................................32Figure35.CLE1000GUI...............................................................................................................................................33Figure36.InsertionLossperTraceLength........................................................................................................34Figure37.InsertionLossConnectionsTable.....................................................................................................34


Figure38.BERTScopeSetup......................................................................................................................................35Figure39.ScopeSetupandMeasurement...........................................................................................................36Figure40.Measuredtransitionamplitude(Example825mVpp)..............................................................37Figure41.Measurednon-transitionamplitude(Example254mV).........................................................37Figure42.MeasuredPreshootamplitude(Example622mV).....................................................................38Figure43.BERTScopeSetup#2...............................................................................................................................39Figure44.ScopeSetupandMeasurement#2....................................................................................................39Figure45.AmplitudeEqualizationSetup............................................................................................................40Figure46.BERTScopeJitterSetup..........................................................................................................................41Figure47.BERTScopePatternSetup.....................................................................................................................42Figure48.DPOJETConfigureSetup........................................................................................................................42Figure49.RJDJSetup....................................................................................................................................................43Figure50.ScopeAdvancedSetup............................................................................................................................43Figure51.ScopeRecordLengthSetup..................................................................................................................44Figure52.ScopeWaveformCapture......................................................................................................................44Figure53.BERTScopeRJCapture...........................................................................................................................45Figure54.SweepJitterRangeandMask..............................................................................................................46Figure55.SweepJitterBERTScopeSetupat30KHz.......................................................................................46Figure56.SweepJitterBERTScopeSetupat1MHz-100MHz......................................................................47Figure57.SweepJitterDPOJETMeasurementat1MHz-100MHz............................................................48Figure58.Calibrationat1MHz-100MHz..............................................................................................................48Figure59.SweepJitterDPOJETMeasurementat1MHz-100MHz............................................................48Figure60.ChannelInsertionLossMaskbyChannelType...........................................................................49Figure61.ISISetup........................................................................................................................................................50Figure62ScopeSetup#1............................................................................................................................................50Figure63ScopeSetup#2............................................................................................................................................50Figure64ScopeAcquisitionModeSetup.............................................................................................................51Figure65CaptureMeasurement.............................................................................................................................51Figure66SavetheWaveform...................................................................................................................................52Figure67SeasimInsertionLossOutputGraph.................................................................................................53Figure68SpecificationMask.....................................................................................................................................54Figure69InsertionLossat27.5%ISI(-16.9dB)..............................................................................................54Figure70InsertionLossat30.%ISI(-17.9dB).................................................................................................55Figure71InsertionLossat32.5%ISI(-18.9dB)WithinTarget................................................................55Figure72InsertionLossCalibrationforLongChannel–ILfallsbetweenrequiredmask............56Figure73BERTScopeSetupforALLZEROPattern.........................................................................................56Figure74BERTScopeSetup#2................................................................................................................................57Figure75ArtekISISetup............................................................................................................................................57Figure76ScopeMeasurement.................................................................................................................................58


Figure77ScopeMeasurement.................................................................................................................................59Figure78SetupforCalculatingtheStressedVoltageEye............................................................................60Figure79StressedVoltageEyeParameters.......................................................................................................60Figure80ScopeSetup..................................................................................................................................................61Figure81AcquiredWaveform..................................................................................................................................62Figure82ApplySeasim...............................................................................................................................................62Figure83GraphicalComparisonofOriginalandAfter-ApplicationResponse...................................63Figure84GraphicalStepResponseComparison..............................................................................................63Figure85SeasimBaseNameSetup........................................................................................................................64Figure86SeasimJitter/NoiseSetup......................................................................................................................65Figure87SeasimEqualizerSetup...........................................................................................................................65Figure88SeasimSimulatedEyeDiagram#1....................................................................................................66Figure89SeasimSimulatedEyeDiagram#2....................................................................................................67Figure90SeasimSimulatedEyeDiagram#3....................................................................................................68Figure91LayoutforLongChannelCalibration................................................................................................69Figure92SpecificationforLongChannelCalibration....................................................................................69Figure93ScopeSetup..................................................................................................................................................70Figure94SeasimMainSetup....................................................................................................................................71Figure95SeasimJitter/NoiseSetup......................................................................................................................72Figure96SeasimEqualizerSetup...........................................................................................................................73Figure97Waveform#1...............................................................................................................................................74Figure98ReceiverTestEquipmentSetup..........................................................................................................75Figure99ReceiverTestConfigureBERTScope.................................................................................................76Figure100ReceiverTestConfigureforStressedJitter..................................................................................77Figure101ReceiverTestConfigureBERTScopeDetector...........................................................................78Figure102ReceiverTestPerformBERTest......................................................................................................78Figure103ReceiverStressedJitterTestBERTScopeSetup........................................................................79Figure104ReceiverStressedJitterTestBERTScopeSetup........................................................................80Figure105ReceiverStressedJitterTestBERTScopeDetector..................................................................80Figure106ReceiverStressedJitterPerformBERTest..................................................................................81Figure107SelectPVTConfiguration.....................................................................................................................83Figure108AddFirstPVTAutomationParameter...........................................................................................83Figure109SeteachPVTParameterValueinSequence................................................................................84Figure110AddSecondPVTParameter................................................................................................................84Figure111ApplytoTests...........................................................................................................................................85Figure112SelectApplicableTests.........................................................................................................................85Figure113.SelectPVTTeststoRun.......................................................................................................................85Figure114RunTestswithPVT................................................................................................................................86


ListofTablesTable1.EquipmentRequirements-Systems.....................................................................................................10Table2.EquipmentRequirements-Cables........................................................................................................10Table3.PresetsforWaveformTests.....................................................................................................................35Table4.StressedJitterTests.....................................................................................................................................45Table5.AvailableParameters...................................................................................................................................82Table6.ApplicableTests.............................................................................................................................................82Table7.PVTAutomation–InternalJitterMarginSearchAlgorithms....................................................86Table8.PVTAutomation–IterationSequenceExample..............................................................................87


RevisionRecordVersion Revision

DateDescriptionofChanges Author(s)

1.0 5/2016 GRL-PCIE3-MOIAddSoftwareGuide.AddAdvancedFeatures.

BillAltmann(GRL)[email protected]


1 IntroductionReceiverdevicecomplianceensurescorrectdatadetectionbythereceiverforanacceptablebiterrorratio(BER).PCIeBaseGen-3devicesshallsupportaBERthatislessthan10-12(i.e.,fewerthanonebiterrorper1012bits)whenasignalwithvalidvoltageandtimingcharacteristicsaredeliveredtothereceivercompliancepoint[1].Thecorrespondingsignalpropertiesforverifyingreceivertoleranceshouldincludethemaximumallowablejitter,noiseandsignalloss.ThisdocumentdescribesthestepbystepcalibrationandprocedurestoperformtheReceiverJitterTolerancetestasspecifiedinthePCIeBase3.0StandardusingtheTektronixBERTScope.TheBERTScopeandappropriateaccessoriesprovidethenecessarytestpatternswithjitter,ISI,andcrosstalk.Additionally,theDPP125CDigitalPre-EmphasisProcessoraddstherequiredtransmitterequalization.ThereceivertolerancetestincludesvariousDifferentialModeSinusoidalInterference,minimumtransmittervoltageamplitude,andjitterwhichincludesrandomjitterincludingasinusoidalperiodicjittercomponentthatissweptacrossspecificfrequencyintervals.OncethestressedreceivertolerancetestsetuphasbeencalibratedtheBERTScopetransmitsaModifiedCompliancepatterntothereceiverandmonitorstheloopbackpatternhasaBERthatislessthan10-12withaconfidencelevelof95%.

2 ReferenceDocuments[1]PCIExpress®BaseSpecificationRev.3.1aDecember7,2015[2]TektronixPCIeGen3BaseMOI(55w-2428589-0)


3 ResourceRequirements3.1 EquipmentRequirements

TABLE1.EQUIPMENTREQUIREMENTS-SYSTEMS

Equipment Qty.

Description KeySpecificationRequirementTektronixP.N.

BSA125Corhigher 1 12.5Gb/sBERTScope RequiresoptionSTRforstressgeneration

DPO/MSO70000DX 1 Real-timeoscilloscope ≥20GHzbandwidth

DPP125CorDPP125B

1 DigitalPre-EmphasisProcessor

CR125Aorhigher 1 12.5Gb/sClockRecoveryUnit

UsedforDUT-sourcedreferenceclockapplications.NotrequiredforBERT-sourcedreference.

ArtekA2 1 ISIGenerator ProgrammableISIGenerator(optional)

AFG3000 1 ArbitraryFunctionGenerator

120MHzSineWaveGenerator

Combiner 1 CombineDifferentialMode(DMI)andACCommonModewithstressedRxtestpattern.

SeasimApplicationfromPCI-SIG

1 SimulationSoftwareofEyeOpeningatTP2P

TABLE2.EQUIPMENTREQUIREMENTS-CABLES

Equipment Qty. KeySpecificationRequirementTektronixP.N.

T+MSF104PE/11PC35/11PC35/500mm 3 174-6663-00

T+MSF104PE/11PC35/11PC35/1000mm 2 PMCABLE1M

T+MMF141/16SMA/16SMA/200mm 3 174-6664-00

T+MMF141/16SMA/16SMA/300mm 1 174-6665-00

T+MMF141/16SMA/16SMA/500mm 1 174-6666-00

T+MMF141/11SMA/16SMA/1.829M 2 174-6667-00

3.2 SoftwareRequirementsSeeTable1.


4 CalibrationPCIecalibrationwillbedoneat3testpoints:TP1andTP2andTP2P.TP1isaphysicaltestpointforcalibrationwithouttheeffectofbreakoutchannellength.TP2,istestpointthatwillaffecttheeyeopeningduetotracelength.TP2P,isantestpointcalculatedbysoftwaretoolSeasimtosimulatetheeyeopeningafterapplyingRxBehavioralpackage,RxCTLE,DFE(ifrequired).

4.1 CalibrationProcessConnectionSetups

4.1.1 CalibrationforTP1

FIGURE1.TYPICALSETUPFORTP1CALIBRATIONConnectionSteps:1. ConnectBERTScopeData(+)toDPP.2. ConnectBERTScopeClkOuttoDPP.3. ConnectDPPData(+)outtoCombinerIn.4. ConnectDPPData(-)outtoCombinerIn.5. ConnectAFGOutput1toCombinerCM-IN.6. ConnectBERTScope(realpanel)SI-outtoCombinerDMIn.7. ConnectCombinerDataOuttoTekScopeChan1andChan2.


4.1.2 CalibrationforTP2

FIGURE2.TYPICALSETUPFORTP2CALIBRATIONConnectionSteps:1. ConnectBERTScopeData(+)toDPP2. ConnectBERTScopeClkOuttoDPP3. ConnectDPPData(+)outtoCombinerIn4. ConnectDPPData(-)outtoCombinerIn5. ConnectAFGOutput1toCombinerCM-IN6. ConnectBERTScope(realpanel)SI-outtoCombinerDMIn7. ConnectCombinerDataOuttoArtekISIBoxInput8. OutputsofArtekISIBoxconnectTekScopeChan1andChan2

5 Software5.1 SetupThissectionprovidesproceduresforinstalling,configuring,andverifyingtheoperationoftheGRLPCIeBase3.0RxTestsolution.Italsowillhelpyoufamiliarizeyourselfwiththebasicoperationoftheapplication.ThesoftwareinstallerautomaticallycreatesshortcutsintheDesktopandStartMenu.Toopentheapplication,followtheprocedureinthefollowingsection.


5.1.1 LaunchandSetupSoftware5.1.1.1 OntheBERTScope1. SelectView>System>ToolsTab.2. UnderUtilitiesColumn,presstheRemotebutton.3. InRemoteWindow,SelectTCP/IP.4. ChangeTerminatorto“LF”.PresstheConnectButton.SeeFigure3.

a) Ifyouseeanerrorpop-upwhenpressingtheConnectbutton.TryadifferentPort.Forexample,changePort23to21.

5. AddressandPort#onRemoteClient.ItwillbeneededtoconnectBERTScopetoautomationsoftware.

6. Minimize,butdonotclose,theRemoteClientWindow.

FIGURE3.REMOTECLIENTWINDOW


5.1.1.2 OnthePCUsedforGRLFrameworkInstallation.1. NavigatetoStartMenu>AllPrograms>GRL>GRLAutomatedTestSolutions.

FIGURE4.GRLAUTOMATEDTESTSOLUTIONSINSTARTMENU

2. ClickApplication>RxTestSolution>PCIe3.0BaseRxTesttoopentheapplication.

FIGURE5.RXTESTSOLUTIONSINGRLAUTOMATEDTESTSOLUTIONSWINDOW


3. Toenablelicense,gotoLicense->LicenseDetails.ThedialoginFigure6willpopup.

FIGURE6.LICENSEDETAILSWINDOW

4. ActivateLicense:a) IfyouhaveanActivationKey,pleaseenterintheboxprovidedandpressActivate.b) IfyoudonothaveanActivationKey,pressClosetousetheSWfor10Daysfreeof

charge.Note:Oncethe10-daytrialtimesout,youwillneedtorequestanactivationkeyforfutureusageonthesamecomputeroroscilloscope.ThedemoSWisalsolimitedinitscapabilityinthatitwillonlycalibratethemaximumfrequencyforeachdatarate.Thus,thedemoversioncannotbeusedtofullycalibrateandtestadevice.ForDemoandBetaCustomerLicenseKeys,[email protected].

5. ClickonEquipmentSetupicon ontheGRLFramework.6. EntertheBERTScopeIPaddressandPortnumbertomatchwhatisintheBERTScope

RemoteClientwindowshowninStep4-5.7. AttachTekAFGviaUSBtoTekScope/ConnectwithLAN.


8. OnTekScope,opentheapplicationOpenChoiceInstrumentManager.SeeFigure7.

FIGURE7.OPENCHOICEINSTRUMENTMANAGERINSTARTMENU


9. InstrumentManagerwilldisplayalltheconnectedinstrumentsonitslist,asinFigure8:a) GPIB8::1::INST(TekScope)b) TCPIP::192.168.0.39::23::SOCKET(BertScope)c) USB::0x0699::0x0345::C022203::INSTR(AFG)

FIGURE8.INSTRUMENTLISTININSTRUMENTMANAGER

10. Notethesesettings,asinFigure9andFigure10:a) EntertheScopeIPAddress.b) EnterBertScopeIPAddress.c) EnterTektronixAFGUSB/IPAddress.d) EntertheCOMAddressoftheISIGeneratortobeused.


FIGURE9.EQUIPMENTSETUPWINDOW–VIEW#1



11. Checktheconnectionbypressingthe“lightning”button .The“lightning”buttonshouldturngreeniftheconnectionhasbeenverified.

12. Dothisforeachinstrumentthatthatwillbeused,asshowninFigure11.


5.1.2 AdditionalNotesTheUSBdriverSWfortheISIGeneratorbeingusedmustbeinstalledonthePCbeingusedfortestingandtheISIGeneratormustbeconnectedtothePCviaUSB.ThedriverfortheISIGeneratorisavailablefromtheISIGeneratormanufacturer.RefertoAppendixofthisdocumentfordriverinstallationinformationforsupportedISIgenerators.

5.2 CalibratingUsingtheSoftware

5.2.1 SessionInfoTheinformationprovidedwillbeincludedinthereport.

The DUT Information and Test Info are input by the user.

The SW Versions information is automatically populated.

FIGURE12.SESSIONINFO


5.2.2 ConditionsforTestingandCalibrationInthissection,conditionsforTestingandCalibrationwillneedtobeset.Userselectsconditionsfortestingandforcalibration. Whencalibrating,theapplicationwillcalibratetheselectedrange,Sjfrequency,commonmodevoltageanddifferentialvoltagethattheuserchooses.Recommendedprocedure:1. Whencalibrating,selectconditionsforcalibrationandperformdesiredcalibration2. Whentesting:re-selectdesiredconditionsfortesting.Forexample,itmaybeonlynecessary

totestrangeAatSjfrequency.Theuserwouldselecttheappropriateconditionsfortest

FIGURE13.CONDITIONSFORTESTINGANDCALIBRATION

5.2.3 SetupConfiguration5.2.3.1 ISIGeneratorSetupIftestisrunningusingBERTScopeISITraceboard(FormoreinformationonhowtogeneratedesiredinsertionlossusingBERTScopeISITraceboard,pleaserefertoAppendixB),usercansettheISItoNONE.

FIGURE14.ISIGENERATORSETUP


5.2.3.2 CustomSJFrequencySetCustomSJfrequencytotestforconditionsetuponprevioustab.

FIGURE15.CUSTOMSJFREQUENCIES

5.2.3.3 ErrorCounterSelectReceiverbaseDUTloopbackcapability.IfDUTcanbeconfiguredtoloopbackmode,selectLoopback,elseselectManual.

FIGURE16.ERRORCOUNTERSETUP

DetailsontheuseofManualmodewillbeprovidedinafutureversionofthisdocument.


5.2.3.4 LoopbackModeIftheuserselectedloopbackontheErrorCountertab,thentheuserneedstoselect“ClockRecovery”intheClockRecoveryMethoddrop-downontheLoopbackModetab.OtheroptionsontheClockRecoveryMethoddrop-downarenotyetsupported.

FIGURE17.LOOPBACKMODESETUP

PCIEusesthedefaultpattern.DetailsontheuseofCustomPatternswillbeprovidedinafutureversionofthisdocument.5.2.3.5 ComplianceTabSetBERandMaximumErrorallowedfortesting.TheselimitsaresetbytheSpecification.Otherlimitsmaybesetinthesefieldsbytheuser.Thesyntax‘1e-12’indicates10-12,andistheonlysyntaxsupportedinthisfield.

FIGURE18.BERANDMAXIMUMERRORS


5.2.3.6 SeasimTabSetifuserwishestousetheRxBehavioralpackageduringEyeHeightandEyeWidthCalibration.Alsosettheintrinsicjitter(ifrequired)tobeusedintheSeasimcalculation.

FIGURE19.SEASIMSETUP

Detailsontheuseof‘False’intheUserRxPackagefieldwillbeprovidedinafutureversionofthisdocument5.2.3.7 ConnectionTabSetupconnectionofData+andData-inScope.Scopechannelsshallbeassignedaccordingtohowthescopecablesareattachedtothetestsetup.

FIGURE20.CONNECTIONSETUP


5.2.4 SelectingCalibrationStepsUsingtheSoftwareTheSelectCalibrationTestspageistheplacewherethecalibrationteststhatneedtobeperformedareselected.Initially,whenstartingforthefirsttimeorchanginganythinginthesetup,itissuggestedtorunCalibrationfirst.Ifthecalibrationisnotcompleted,theRXTestswillshowanerrormessage.

FIGURE21.SELECTCALIBRATIONTESTSPAGE

5.2.5 RunCalibrationSteps

Fromthepop-upmenu,selecttheRunicon: SkipTestifResultsExist.Ifpreviouscalibrationresultsexist,thensoftwarewillskipcalibrationstepsthathaveexistingreports.ReplaceifResultsExist.Ifpreviouscalibrationresultsexist,thensoftwarewillreplaceeachstepincalibrationwithnewresults.(Restart)DeleteExistingResults.Allpreviousresultswillbedeleted,andeachselectedstepincalibrationwillgeneratenewreport.

FIGURE22.CONNECTIONSETUP


5.3 TestingusingGRL-PCIE3-BASE-RXSoftware

5.3.1 ReceiverComplianceTestsTheSelectTestspageistheplacewherethecomplianceteststhatneedtobeperformedareselected.

FIGURE23.SELECTCOMPLIANCETESTSPAGE

TestsarerunfromthesamescreenasshowninSection5.2.5.

5.3.2 ReceiverMarginTestsTheSelectTestspageistheplacewherethecomplianceteststhatneedtobeperformedareselected.

FIGURE24.SELECTMARGINTESTSPAGE

TestsarerunfromthesamescreenasshowninSection5.2.5.

5.4 ReportTheReportpagehasalltheresultsfromallthetestrunsdisplayed.Ifsomeoftheresultsarenotdesired,theycanbeindividuallydeletedbyusingtheDeletebutton.Alsoforapdfreport,clicktheGenerateReportbutton.Tohavethecalibrationdataplottedinthereport,makesurethePlotCalibrationDataboxischecked.


FIGURE25.REPORTRESULTSPAGE

5.5 InterpretingaReport

5.5.1 DUTInformationThisportionispopulatedfromtheinformationintheDUTtabfromtheSessionInfotab.

FIGURE26.DUTINFORMATION


5.5.2 SummaryTableThisportionispopulatedfromthetestsperformedanditsresults.Thisgivesanoverallviewofalltheresultsanditstestconditions.

FIGURE27.SUMMARYTABLE


5.5.3 CalibrationDataResultsIfPlotCalibrationDatacheckboxischecked,thentheplotsareshowninthispartofthereport.

FIGURE28.CALIBRATIONRESULTSEXAMPLE


5.5.4 ComplianceTestResults

FIGURE29.CALIBRATIONRESULTSEXAMPLE


5.5.5 JitterMarginResults

FIGURE30.JITTERMARGINREPORTEXAMPLE

6 TestSuiteThePCIE3BaseSpecificationtestsarelistedinthedrop-downmenusintheequipmentdescribedinthisMOI.

7 AppendixA:ARTEKCLE1000-A2Installation7.1 ISIGeneratorDriverInstallationIfusingARTEKCLE1000-A2forVariableISICalibration,followthesestepstoinstalltheISIgenerator driver before selecting it as an ISI channel in the DP Configuration Utility.

1. ConnecttheCLE1000-A2tothePCbeingusedasthecontroller,usingaUSB2.0cable.2. TurnonthefrontpanelpowerswitchontheCLE1000-A2.3. RightClickonMyComputer>Manage>DeviceManager.IfnoSWfortheCLE1000-A2has

beeninstalled,youwillseea‘bang’inthedevicemanager.SeeFigure31.


FIGURE31.DEVICEMANAGERWINDOW

4. ToinstalltheCLE1000-A2,gotohttp://www.aceunitech.com/support.htmlanddownloadtheControlSWpackagefortheCLE1000.

5. UnpacktheCLE1000SW.zipfile.6. InstalltheCLE1000Driver:

a) InDeviceManager,rightclickonCLE1000>UpdateDriver.b) SelectBrowseMyComputerforDriverfromWindowsdialog.SeeFigure32.c) BrowsetotherootdirectoryoftheunzippedCLE1000SWfolder.d) PressNext.Youwillbeaskedtoconfirmyourrequesttoinstalladriver.e) PressInstall.DriverSWwillcompleteinstallation.

7. Once Installationcompletes,theDeviceManagershouldlooklikeFigure34.

FIGURE32.UPDATEDRIVERWINDOW


FIGURE33.WINDOWSSECURITYWINDOWANDCONFIRMATIONWINDOW

FIGURE34.DEVICEMANAGERWINDOWAFTERINSTALLATION

TheCLE10000SWdriverisnowinstalledandtheCLE1000cannowbeselectedforuseremotely using the GRL DP Configuration Utility.


7.2 CLE1000GUIInstallationIt may also be useful to install the CLE1000 GUI, so that the ISI channel can also be controlled manually from the PC. To install the SW, do the following:

1. IntheCLE1000SWfolder,clickontheSetup.exefile.Onceinstalledsuccessfully,thefollowingGUIwillappearonthedesktop.

2. YoucannowclosetheGUIifyoudon’twanttohavemanualcontrol.

FIGURE35.CLE1000GUI


8 Appendix B: BERT ScopeISITraceBoard TheBERTScopeISITraceBoardisrequiredforPCIeBase3.0InsertionLosstests.Figure36describestheinsertionlossat4GHzonvarioustracelengthsontheBERTScopeISITraceBoard.

FIGURE36.INSERTIONLOSSPERTRACELENGTH

ForPCIeGen3.3Typeoftracelengthtobetested,followthetableinFigure37toconnectpointsoftraceboardtogetthedesiredinsertionloss.

FIGURE37.INSERTIONLOSSCONNECTIONSTABLE


9 AppendixC:ManualTestMethods9.1 WaveformTests

9.1.1 PreshootandDeemphasisPCIeBaseusestwopresetsfordifferenttracelengthsofthebreakoutboard.BothDeemphasisandPreshootarecalibratedforthetargetdBforeachpreset.SeeTable3.

TABLE3.PRESETSFORWAVEFORMTESTS

Preset Preshoot Deemphasis

4 0.0dB 3.5dB

7 0.0dB -6.0dB

9.1.1.1 BERTScopeSetup1. SettheBERTScopetodefaults.2. SetGeneratorto8Gpbs(PCIeGen3Speed)3. DisableAllstressedjittercomponent(Rj,Sjetc)4. SettheOutputamplitudeto800mV5. SettheDPPOutput460mV6. DefaulttheDPPto0.0dBPreshootandDeemphasis,asshowninFigure38.7. Loadwith64ONEs,64ZEROsand128ClkPatterntoBERTScope.

FIGURE38.BERTSCOPESETUP


9.1.1.2 ScopeSetup&Measurement1. SetthescopetoDefaults.2. SetscopeSamplingmodetoRealTimeOnly.3. Setscopeacquisitiontoaveragewith256waveforms.4. SetthetriggerofA_Eventtypetotimeout.5. SetChan1andChan2displaytoON;configurethescaleandoffsetsothewaveformcovers

80%ofthescreen.6. EnableMath1;setMath1toCh1-Ch2;settheautoscale.7. TurnoffChan1andChan2.8. AcquireWaveform.AnexampleisshowninFigure39.

FIGURE39.SCOPESETUPANDMEASUREMENT


9.1.1.3 DeemphasisMeasurementNow,theactualde-emphasisandpre-shootmustbeverifiedonscope.1. Usingcursors,measurepeak-to-peaktransitionamplitudeasshownFigure40.

FIGURE40.MEASUREDTRANSITIONAMPLITUDE(EXAMPLE825MVPP)2. Usingcursors,measurepeak-to-peaknon-transitionamplitude,asshowninFigure41.

FIGURE41.MEASUREDNON-TRANSITIONAMPLITUDE(EXAMPLE254MV)


3. De-emphasis=20log[Non-transition/Transition]=20log[254mV/824mV]=20log[0.31]=-10.2dB9.1.1.4 PreshootMeasurement1. Usingcursors,measurepre-shootamplitude,asshowninFigure42.

FIGURE42.MEASUREDPRESHOOTAMPLITUDE(EXAMPLE622MV)2. Measurepre-shootamplitude.3. Calculatethepre-shoot:20log[Pre-shoot/Non-transition]=20log[622mV/254mV]=20log[2.44]=7.8dB4. IncreasethePreshootandDeemphasislevelstorecordthemeasuredPreshootand

DeemphasisdBfor3.5and-6.0,measuredrespectively.SeeFigure43andFigure44.5. Recordthevalue.


FIGURE43.BERTSCOPESETUP#2

FIGURE44.SCOPESETUPANDMEASUREMENT#2


9.1.2 LaunchAmplitudeTheLaunchAmplitudeiscalibratedfortargetminimumpeak-to-peakamplitudeof800mVppaftercombiner.9.1.2.1 BERTScopeSetup1. UsingthesameTP1CalibrationSetup.2. SetDPPto0.0forPreshootandDeemphasis.3. SetDPPAmplitudeto300mV.4. SetPatterntoClk/256.9.1.2.2 ScopeSetupandMeasurement:1. UsingthesameSetup,ScaleChan1andChan2respectively.2. TurnoffChan1andChan2.3. TurnOnMath1,settoch1-ch2.4. SettheAcquisitionmodetoAverageof2565. SetMeasureAmplitudeofMath1.6. Acquirewaveform.7. ReadtheMEANvalueofamplitudemeasurement.8. TunetheDPPOutputuntilAmplitudemeasuredinscopeis800mV.

9.1.3 AmplitudeEqualizationPerformtheequalizationoflowfrequencyandhighfrequencyamplitudeatTP1.ThisisdonebyaddingsmallamountofDeemphasisofDPP,sothatlowfrequencyandhighfrequencyhavethesameamountofamplitudeaftercombiner.1. UsingthesamesetupofcalibrationforTP1,andsameBERTScopeandTekScopesetting.2. TunetheDPPPreCursorandPostCursorsoDeemphasisis0.0dB.3. TunetheDPPPostCursoruntilthelowfrequencyandhighfrequencycomponentof

amplitudeissamelevel.SeeFigure45.

FIGURE45.AMPLITUDEEQUALIZATIONSETUP


4. SavethePostCursorvalue.

9.1.4 RJCalibration1. UsingaClockpattern(1100),theRJvalueof0ps-5pswillbecalibrated.(Bothlimitsare

RMSvalues.)RJisusedtoadjusttheEyeWidth(EW)inStressJitterTest.2. RJtargetis2ps(RMS).3. TektronixDPOJETisusedasthecalibrationtool.9.1.4.1 BERTScopeSetup1. SettheGeneratorto8Gpbs.2. SettheSub-rateclockmodeisStressedClock.3. SettheRJEnable.4. SettheSJEnable,SettheSJAmplitudeto0.0mV.SeeFigure46.

FIGURE46.BERTSCOPEJITTERSETUP


5. SetthePatternofgeneratorto1100.ram(1-1-0-0pattern).SeeFigure47.

FIGURE47.BERTSCOPEPATTERNSETUP

9.1.4.2 DPPSetup1. SettheDPPPreShootandDeEmphasisusingP4preset(0.0dbforboth).2. Setthepostcursorandprecursorbasedonequalizedamplitudevaluerecordedearlier.3. SetDPPoutputthatreflect800mVamplitudethatrecordedearlier.9.1.4.3 ScopeSetup1. SettheDPOJETConfigure->ClockRecoverytoConstantClockMean.

FIGURE48.DPOJETCONFIGURESETUP


2. UnderRJDJsettingsforclocksignal.

FIGURE49.RJDJSETUP

3. OntheAdvancePanel,settheNominalDataRateto8Gpbs.

FIGURE50.SCOPEADVANCEDSETUP


4. SettheHorizontalmodetoManual,setrecordlengthto2M.

FIGURE51.SCOPERECORDLENGTHSETUP

5. Cleartheresult.RunSingle.

FIGURE52.SCOPEWAVEFORMCAPTURE

6. ReadthemeasuredRJ1.


7. TunetheBertScopeRJvalue.

FIGURE53.BERTSCOPERJCAPTURE

8. ThetargetmeasuredvalueforRJ:2psRMSand3psRMS.

9.1.5 SJCalibrationTherearefourSJ(SweepJitter)frequenciesrequired:30KHz,1MHz,10MHzand100MHz.SJneedstobecalibrated(with1100pattern)forallcasesintheproperway.

TABLE4.STRESSEDJITTERTESTS

Frequency

30KHz

1MHz

10MHz

100MHz 0.1 UIPP

StressedVoltageTest:

StressedJitterTest:


TheStressedJittertestrequiresthetesttopasseachandeveryfrequency,withitsrespectiveSJamplitudeat30KHz,1MHz,10MHzand100MHz.

FIGURE54.SWEEPJITTERRANGEANDMASK

Usingthissamesetupateachfrequency,makethemeasurement.9.1.5.1 CalibrateSweepJitterat30KHz.1. OnBERTScope,EnablePhaseModulatorandSetPMFrequencyto30KHzandPMDevn:1UI.

FIGURE55.SWEEPJITTERBERTSCOPESETUPAT30KHZ

2. OntheBERTScope,usingDPOJET,measurePJ1.Note,forthismeasurementtheDPOJETClockRecoveryMethodshouldbesettoConstantClock–Meansoastonotfilterthelowfrequencyjittermodulationthatistobeverified.

3. ReadthePJ1measurement.Itisinunitsofseconds.ConverttoUI.


9.1.5.2 CalibrateSweepJitterat1MHz,10MHz,100MHz1. SetSineJitterinitiallyto10%UI.

FIGURE56.SWEEPJITTERBERTSCOPESETUPAT1MHZ-100MHZ

1. MeasureSJusingDPOJET.


FIGURE57.SWEEPJITTERDPOJETMEASUREMENTAT1MHZ-100MHZ2. ReadthePJ1value.3. Again,notevalueofSJonBERTScopeneededtogenerate10%SJatreferencepoint.4. Calibrationfor1MHz,10MHzand100MHzwillneedtosettheSJFrequencyandSJ

AmplitudeinsteadofPM.

FIGURE58.CALIBRATIONAT1MHZ-100MHZ

FIGURE59.SWEEPJITTERDPOJETMEASUREMENTAT1MHZ-100MHZ


9.2 ChannelCalibrationTests(TP2)

9.2.1 ChannelCalibrationInsertionLossPCIeGen3defines3typesofcalibrationchannel.1. None2. Short3. LongDefinedbyFigure60,eachchannelinsertionlossmustmeetthemaskdependingonitschanneltype.VariableandprogrammableISIinjectorisneededtosimulatethetracelengthtoachievethetargetlossforeachchannel.

FIGURE60.CHANNELINSERTIONLOSSMASKBYCHANNELTYPE

Insertionlossismeasuredbydifferentiatingstepresponse,anddoingtheFFToftheresultingimpulseresponse.TheSeasimapplicationprovidesthemethodtocalculationtheinsertionlossgiventhestepresponse.9.2.1.1 BERTScopeSetup1. SetBERTScopeSetPatterntoclk/256.2. SetDPPSetDeemphasisandPreshoottoP4withpostcursorandprecursorforequalization

ofamplituderecordedearlier.3. SetDPPoutputthatreflectsthe800mVamplitudethatwasrecordedearlier.4. DisableRj.5. DisableSj.9.2.1.2 ISISetup1. OpentheArtekISIapplication.


2. SettheISI%to0.0.

FIGURE61.ISISETUP

9.2.1.3 ScopeSetup1. TurnOnCh1andCh2,scalech1andch2correctly.2. TurnOffch1andch23. TurnONMath1,setch1-ch2.Scalecorrectly.4. SetupTriggerAEventtoEdge,sourcetochan1,5. SetupTriggerA-BEventwithAcquisitionDelayto4ns.

FIGURE62SCOPESETUP#1

FIGURE63SCOPESETUP#2


6. SetupAcquisitionModetoAverageof2048Waveforms.

FIGURE64SCOPEACQUISITIONMODESETUP

7. RunSingleandcapturemeasurement.

FIGURE65CAPTUREMEASUREMENT

8. SavetheWaveformto.DATformat.9. Modifythe.datformattoSeasimcompatiblewaveformwithnameending_vict.rfstep1.10. The_vict.rfstep1formatisconsistoftime[SPACE]Voltage_level[NewLine].11. Copythe_vict.rfstep1stepresponseto\step_responsefolder.


12. LaunchSeasim_GUI.pyw.

FIGURE66SAVETHEWAVEFORM

13. ChangethefilenameBasenameSteptothefilenamesavedandmodified.14. ClickRun.


15. Seasimwilloutputgraphindicatingtheinsertionloss.

FIGURE67SEASIMINSERTIONLOSSOUTPUTGRAPH

16. Insertionlossat4GHzis-9dBforsampleabove.17. IncreasetheISI%thenrecapturethewaveform,save,modifyandrunSeasim.18. EnsuretheinsertionlossisbetweenthePCIeGen3specsforrespectivechanneltype.


9.2.1.4 ExampleResults

FIGURE68SPECIFICATIONMASK

FIGURE69INSERTIONLOSSAT27.5%ISI(-16.9DB)


FIGURE70INSERTIONLOSSAT30.%ISI(-17.9DB)

FIGURE71INSERTIONLOSSAT32.5%ISI(-18.9DB)WITHINTARGET


FIGURE72INSERTIONLOSSCALIBRATIONFORLONGCHANNEL–ILFALLSBETWEENREQUIREDMASK

9.2.2 ChannelCalibrationDifferentialModeSinusoidalInterference9.2.2.1 BERTScopeSetup1. SetALLZEROPattern.

FIGURE73BERTSCOPESETUPFORALLZEROPATTERN


2. SetallJitterto0mVamplitude.3. EnabletheSINEINTERFERENCE.4. SettheFrequencyto2.1GHz.5. SettoExternal.

FIGURE74BERTSCOPESETUP#2

6. SettheSineInterferenceAmplitudeto100mV.9.2.2.2 ISISetup1. SettheArtekISI%tocalibratedchanneltype.

FIGURE75ARTEKISISETUP


9.2.2.3 ScopeSetup1. SetAcquisitionAverageto256.2. ScaleCh1andCh2accordingly.3. TurnonMATH1,ch1-ch2,scaleaccordingly.4. MeasurePeaktoPeakofMath1.5. RunSingle.6. ObtaintheMEANvalueofmath1peaktopeak.7. TunetheSineInterferenceAmplitudesomeasuredvalueis16mV.

FIGURE76SCOPEMEASUREMENT

9.2.3 ChannelCalibrationACCommonModeSinusoidalInterference9.2.3.1 BERTScopeSetup1. RemainALLZEROPattern.2. SettheSINEInterferenceamplitudeto0mV.9.2.3.2 SetupAFG1. EnabletheAFGoutput1.2. SettheOutputModetoSINEwave.3. SettheSINEWavefrequencyto120MHz.4. SettheOutput1Amplitudeto1V.


9.2.3.3 ScopeSetup1. ScaleCh1andCh2.2. SetMATH1toch1+ch2.ScaleMATH1.3. TurnOFFCh1andCH2.4. SetAcquisitiontoAverage256.

FIGURE77SCOPEMEASUREMENT

5. TunetheAFGAmplitude.6. TargetCM:

150mVforLongChannel250mVforShortandNoneChannel

9.3 CalibrationatTP2PTwodistincttestsareutilizedtotestareceiver:oneforitsminimumeyeheight(voltage),andanotherforitsminimumeyewidth(jitter).Theproceduresforcalibratingthestressedeyearesimilar,althoughthenumberandmagnitudeofsignalimpairmentsourcesvariesbetweenthetwotests.


9.3.1 TP2PStressedVoltageCalibrationTheconfigurationforcalibratingastressedvoltageeyeforRxtestingisshownbelowwherethecalibrationprocedureisperformedforallthreecalibration/breakoutchannelcombinations.RjandSjareaddedasdefinedinbelowandcommonmodeanddifferentialmodenoisesourcesareaddedsimultaneously.

FIGURE78SETUPFORCALCULATINGTHESTRESSEDVOLTAGEEYE

FIGURE79STRESSEDVOLTAGEEYEPARAMETERS


EyewidthandeyeheightaredefinedafterapplyingpostprocessingandaredefinedatTP2P.ThelongcalibrationchannelutilizesbothCTLEandDFE,whilethemediumandshortchannelscalibrationchannelsuseCTLEonly.EHissetbyadjustingtheamountofdifferentialnoiseuntilthevaluedefinedbyVRX-SV-8Gisobtained.Ifitisnotpossibletomaintainasufficienteyewidthbyadjustingonlythedifferentialnoise,itisacceptabletoinjectlessdifferentialnoiseandadjustthegeneratorlaunchvoltage.SeasimisusedtopostprocessthereceivereyeatTP2P.Inthiscontext,Rj,Sj,DM-SIsourceareinputtoSeasim.WhileCMSIarecombinedwithclk/256patternsourcefromBERTandcapturedinScope.9.3.1.1 BERTScopeSetup1. SetBERTScopePatterntoclk/2562. TurnOffRj,Sj,DM-SiatBERTScope.3. SetDPPOuputto800mVAmplitudecalibratedearlier.4. SetDPPDeEmphasisandPreshoot.Use“Preset4forShortandNonechannel.UsePreset7

forLongchannel.9.3.1.2 AFGSetup1. TurnOffAFG9.3.1.3 ScopeSetup1. SetupTriggerAEventtoEdge,sourcetochan1,2. SetupTriggerA-BEventwithAcquisitionDelayto4ns.

FIGURE80SCOPESETUP


1. ScaleCh1andCh2,Math1(ch1-ch2)2. SetAcquisitiontoAverageto20483. AcquiretheWaveform.4. SavetheWaveform.

FIGURE81ACQUIREDWAVEFORM

5. ModifyWaveformtoSeasimcompatibleformat.

FIGURE82APPLYSEASIM

6. ApplytheRxBehavioralPackagea) RxBehavioralPackage(inS2P/S4P)file.b) CTLE/DFEandCDRcanbesimulatedinSeasim.


c) RxPackagemodelisconvolutedexternallywithStepresponsebeforeinputtoSeasimd) StepresponseisconverttoFrequencydomain,thenmultiplythemagnitudewiths2p

S21magnitudeandphasecorrespondingtoitsfrequencyrange.e) Itcanberealizedusingpythonscript.f) Acomparisonoforiginalfrequencyresponse(red),andtheafterapplicationofs2p

(purple),showingthes2pRxpackages21graphasagreenline.

FIGURE83GRAPHICALCOMPARISONOFORIGINALANDAFTER-APPLICATIONRESPONSEg) Stepresponsebefore(red)andafter(purple).

FIGURE84GRAPHICALSTEPRESPONSECOMPARISON

7. RunSeasim:a) SettheBaseNameforSteptofilenamesaved.


b) Checktheoptionsontopsaveaspicturebelow.

FIGURE85SEASIMBASENAMESETUPc) OnJitterNoisetab:

i) SettheCorrespondingJittervalueforRj,Sj,DM-SI.ii) DM-SIvalueneedtotunedandvarytoachieveEH.iii) SetDM-SIto0mVforstart.iv) SetLFRandomJitter=Rj(2ps).v) SetLRUniformlydistributedJitter=Sj(0.1UI).


vi) SetLFUniformlyDistributedVoltageNoise=DM-SI14mVormore.

FIGURE86SEASIMJITTER/NOISESETUPd) OnEqualizertab:

i) SettheDFEtapsandmaxMagnitude.ii) IfLongchannelsetto[0.000](DisableDFE)iii) IfShortandNone,setto[0.030],EnablewithMaxof30mV.

FIGURE87SEASIMEQUALIZERSETUPe) RunSimulation.


8. SimulatedEyeDiagramwillbecreated,withitscalculatedEHandEWatBER-12basedonjitterinput.

FIGURE88SEASIMSIMULATEDEYEDIAGRAM#1

9. ObservetheEHandEW.


10. ChangetheDM-SIvalueto15mVandrunsimulationagain.



11. ChangetheDM-SIvalueto16mVandrunsimulationagain.


12. CalibrateuntilEHisobtained.(*)IfEWrangecannotbeachieved,IncreasetheAmplitudefrom800mVto900mVandperformtheStressVoltagecalibrationagainuntilEHandEWareobtained.

9.3.2 StressedJitterCalibration(ForLongChannelOnly)Thestressedjittercalibrationprocedureissimilartothatofstressedvoltage.Onlythelongcalibrationchannel(-20dB)isused.Notethatthesamepostprocessingscriptsareappliedidenticallyastheyareforthestressedvoltageeyecase.Eyewidthisfine-tunedbymakingadjustmentstotheRjsource,whileEHmaybeadjustedbyvaryingthelaunchvoltageatthegenerator.


FIGURE91LAYOUTFORLONGCHANNELCALIBRATION

FIGURE92SPECIFICATIONFORLONGCHANNELCALIBRATION

9.3.2.1 BERTScopeSetup1. SetBERTScopePatterntoclk/2562. TurnOffRj,Sj,DM-SiatBERTScope.3. SetDPPOutputto800mVAmplitudecalibratedearlier.4. SetDPPDeemphasisandPreshoottoPreset7forShortchannel.Preset4forotherchannel

Type.5. TurnOffAFG.


9.3.2.2 ScopeSetup1. SetupTriggerAEventtoEdge,sourcetochan1,2. SetupTriggerA-BEventwithAcquisitionDelayto4ns.

FIGURE93SCOPESETUP3. ScaleCh1andCh2,Math1(ch1-ch2).4. SetAcquisitiontoAverageto2048.5. AcquireWaveform.6. SaveWaveform.7. ModifyWaveformtoSeasimcompatibleformat.


9.3.2.3 ApplyRxBehavioralPackage1. RunSeasim:

a) SettheBaseNameforSteptofilenamesaved.b) Checktheoptionsontopsave,asshowninFigure94.

FIGURE94SEASIMMAINSETUP


c) OnJitterNoisetab.i) SettheCorrespondingJittervalueforRj,Sj.ii) RjvalueneedtotunedandvarytoachieveEW.iii) SetLFRandomJitter=Rj(3psormore).iv) SetLRUniformlydistributedJitter=Sj(0.1UI).v) SetLFUniformlyDistributedVoltageNoise=0.0mV.

FIGURE95SEASIMJITTER/NOISESETUP


d) Equalizertab:i) SettheDFEtapsandmaxMagnitude.ii) Setto[0.030].

FIGURE96SEASIMEQUALIZERSETUPe) RunSimulation.


2. SimulatedEyeDiagramwillbecreatedwithitscalculatedEHandEWatBER-12basedonjitterinput.

FIGURE97WAVEFORM#1

3. ObservetheEHandEW.4. ChangetheRjvalueandrunsimulationagain.5. CalibrateuntilEWisobtained.(*)IfEHrangecannotbeachieved,IncreasetheAmplitudefrom800mVto900mVandperformtheStressJittercalibrationagainuntilEHandEWareobtained.


9.4 ReceiverTest

9.4.1 EquipmentSetup

FIGURE98RECEIVERTESTEQUIPMENTSETUP

9.4.1.1 ConnectionSteps1. ConnectBERTScopeData(+)toDPP.2. ConnectBERTScopeClkOuttoDPP.3. ConnectDPPData(+)outtoCombinerIn.4. ConnectDPPData(-)outtoCombinerIn.5. ConnectAFGOutput1toCombinerCM-IN.6. ConnectBERTScope(realpanel)SI-outtoCombinerDMIn.7. ConnectCombinerDataOuttoArtekBox.8. ConnectArtekBoxOuttoDUTIn.9. ConnectDUTTxOuttoClockRecoveryCR125ADataIn.10. ConnectCR125ADataouttoBERTScopeDetectorDataIn.11. ConnectCR125ASubrateClockOuttoBERTScopeDetectorClockIn.12. ConnecttheExternalClockfromBERTScopetoDUTasRefClk(100MHz).


9.4.2 StressedVoltageReceiverTestOnceacalibratedEHandEWhavebeenobtained,thecablesaremovedtoconnecttheRxDUTtothefarendofcalibrationchannel.TheTxequalizationisthenoptimizedasitwasforthestressedvoltageeyewiththeassumptionthattheDUTRxwillalsooptimizeitsequalization.SjissettoaninitialvaluethatpermitsthereceiverCDRtoachievelock.9.4.2.1 ConfigureBERTScope1. SetGeneratorto8Gpbs.2. SetthePatterntoPCIe_8G_BruteFor.RAM.

FIGURE99RECEIVERTESTCONFIGUREBERTSCOPE


9.4.2.2 ConfigureforStressedJitter1. SettheCalibratedSJfor0.1UIat100MHz.2. SettheCalibratedRjfor2ps(RMS).3. SettheCalibratedSineInterferenceAmplitudethatiscalibratedtoachieveEHandEW(DM-

SI).4. SettheSineInterferenceFrequencyto2.1GHz.5. SettheSineInterferencemodetoExternal.6. SettheDPPOutputtocalibratedamplitudetoachieveEHandEW.

FIGURE100RECEIVERTESTCONFIGUREFORSTRESSEDJITTER

7. ConfigureISIbysettingArtekISI%valuetocalibratedchannelType.8. ConfigureAFG:

a) SetOutput1ofAFGONb) SetOutput1ModetoSineWavec) SetSineWaveFrequencyto120MHzd) SettheSineWaveAmplitudetoCalibratedvalue.

9. SetuptheBERTScopeDetector:a) ClicktheAutoAlign


FIGURE101RECEIVERTESTCONFIGUREBERTSCOPEDETECTOR

9.4.2.3 BitErrorRateTest1. WiththeDUTinloopbackmode,andBERTScopesynchronizewithpattern.2. Compliancetestmaybegin.3. ClicktheResetResult.4. ClicktheRUN.5. LettheDetectorRun,stopwhentheBITsismorethan1xE12.6. ReadtheErrorvalue.7. Iftheerroriszero(0),thenthetestpasses.

FIGURE102RECEIVERTESTPERFORMBERTEST


9.4.3 StressedJitterReceiverTest(100MHz)9.4.3.1 ConfigureBERTScope1. SetGeneratorto8Gpbs.2. SetthePatterntoPCIe_8G_BruteFor.RAM.

FIGURE103RECEIVERSTRESSEDJITTERTESTBERTSCOPESETUP


9.4.3.2 ConfigureforStressedJitterat100MHz1. SettheCalibratedSJfor0.1UIat100MHz.2. SettheCalibratedRJthatiscalibratedduringStressedJitterCalibrationthatachievedEW

andEH.3. SettheCalibratedSineInterferenceto0mV.4. SettheDPPOutputtocalibratedamplitudetoachieveEHandEW.

FIGURE104RECEIVERSTRESSEDJITTERTESTBERTSCOPESETUP

5. ConfigureISIbysettingArtekISI%valuetocalibratedchannelType.6. ConfigureAFGbysettingOutput1ofAFGOF.7. SetuptheBERTScopeDetectorbyclickingonAutoAlign.

FIGURE105RECEIVERSTRESSEDJITTERTESTBERTSCOPEDETECTOR


9.4.3.3 BitErrorRateTest1. WiththeDUTinloopbackmode,andBERTScopesynchronizewithpattern.2. Compliancetestmaybegin.3. ClicktheResetResult.4. ClicktheRUN.5. LettheDetectorRun,stopwhentheBITsismorethan1xE12.6. ReadtheErrorvalue.7. ItisPassiferroris0.

FIGURE106RECEIVERSTRESSEDJITTERPERFORMBERTEST


10 PVTAutomationGraniteRiverprovidessoftwaretosupportrepeatedtestingwithinsequencesofparametervalues,whichareappliedtotheDUTduringthetests.

10.1 AvailableParametersTable5liststheparameterswhichcanbecontrolledbythePVTAutomationsoftware.Uptoeightvaluesmaybespecifiedforeachparameter.

TABLE5.AVAILABLEPARAMETERS

Symbol Parameter Units

RJ RandomJitter Picoseconds

ISI InterSymbolInterference PercentofUI

SJ SinusoidalJitter Picoseconds

Amplitude LaunchVoltage Millivolts,peak-to-peak

CM CommonMode(noisesource)

DM DifferentialMode(noisesource)

10.2 ApplicableTestsTable6liststhetestswhichcanbecontrolledbythePVTAutomationsoftware.PVTparametershavenoeffectonothertestsinthesuite.

TABLE6.APPLICABLETESTS

TestTitle

StressVoltageSweepTest(none)

StressVoltageSweepTest(short)

StressVoltageSweepTest(long)

StressJitterSweepTest(long)


10.3 SettingupPVTValueSequences1. SelectthePVTConfigurationicononthetoolbar.SeeFigure107.

FIGURE107SELECTPVTCONFIGURATION

2. Addaparametertotheselectedtestbyselecting“AddCondition”.SeeFigure108,whichselects‘SJ’asthenewconditiongroup.Nodrop-downmenuofallowedparameternamesisprovided.RefertoTable5.Ashortdescriptionmaybeprovided.Thisdescription,andthenamesoftheindividualstep‘Variables’areallincludedinthetestresultsReport.

FIGURE108ADDFIRSTPVTAUTOMATIONPARAMETER

3. Enteroneormoreparametervalueforthestepsofthetestconditionsequence.Takecaretoincludethesuffixfortheunits,andtoassignvalueswhichareappropriateforthatparameteraccordingtothePCIE3specification.SeeFigure109,whichshowsfourstepsforparameter‘SJ’,named‘SJ1’,‘SJ2’,‘SJ3’and‘SJ4’,andassignedvalues1ps,1.2ps,1.8psand3ps,respectively.WhenfinishededitingtheTestConditions,clickon“OK”.Notethatindividualstepsmaybeselected,theneditedorremovedfromthelist.


FIGURE109SETEACHPVTPARAMETERVALUEINSEQUENCE

4. Addasecondparameter.SeeFigure110.,whichadds‘SweepISI’,withthreevalues,eachexpressedasapercentage.

FIGURE110ADDSECONDPVTPARAMETER

5. Repeatsettingvaluestoeachoftheallowedparameters.Thoseparameterswhicharenotsetupwithexplicitvalueswillusethedefaultvalue.


6. Fromthemenu,applythesequencesofparameterstotheselectedtests(seeFigure111andFigure112),whichbuildsa“StressTestPlan”.

FIGURE111APPLYTOTESTS

FIGURE112SELECTAPPLICABLETESTS

7. SelectthePVTteststorun(seeFigure113).

FIGURE113.SELECTPVTTESTSTORUN


8. Runthetestsusingthe“RunTestswithPVT”button(seeFigure114).

FIGURE114RUNTESTSWITHPVT

10.4 SearchAlgorithm

10.4.1 JitterMarginTestingAfterselectingtheparametersandtheirranges,theusermayselectfromalistofsearchalgorithmstofindtheboundsofjittermargin.

TABLE7.PVTAUTOMATION–INTERNALJITTERMARGINSEARCHALGORITHMS

Symbol Algorithm

Bottom-Up

Top-Down

Binary

10.5 TestResultsResultsfromtheselectedPVTtests,eachusingtheoneormoredefinedPVTparameters,arecollectedintheTestReport.Theselectedtestsareallrun,oneaftertheother,foreachpermutationoftheparameters.Theparameterdefinedfirstisvariedmostslowly;thelast-definedparameterisdefinedmostquickly.Forexample,consideringtheparametersandtestsdefinedandselectedinFigure108toFigure113williterateasshowninTable8.(Individualparameterstepnamesarenotshown.)


TABLE8.PVTAUTOMATION–ITERATIONSEQUENCEEXAMPLE

Seq. SJ ISI Tests

1 1.0ps 10% All4ParameterSweepingTests












10.6 SavingandLoadingaPVTSessionWhenusingthePVTAutomationsoftware,the“SaveAs”and“Restore”buttonsarenotused.Tosaveasession,withallofthePVTparameterinformation,thetestresults,andanywaveforms,usethe“Options”commandonthemenubar,thenthe“SaveSession”command.Toloadasessionbackintothesoftware,includingthesavedparametersettings,usethe“Options”commandonthemenubar,thenthe“LoadSession”command.Theconfigurationandsessionresultsaresavedinafilewiththeextension‘.ses’,whichisacompressedzip-stylefile,containingavarietyofinformation.

END_OF_DOCUMENT