Data Sheet

TeledyneLeCroyCorporation USB3.1ElectricalTestModes
596 USBProtocolSuiteUserManual
Usetheterminationbuttonstoverifythatadevicesees(ordoesnotsee)
terminationfromtheexerciserports.Afteryoufinish,besuretoputthembackin
themodethatyouexpectthemtobeinwhendone.
6. SettheLoopbackInterval.Thisisthetimeintervalinmillisecondsinwhicheachof
theBERTorderedsets(BRST,BDAT,andBERC)willbetransmitted.The minimum
valueis1 ms.Themaximumvalueis2^28=268,435,456 ms.
7. PresstheStartbutton.
Loopbackentryandpatterngenerationoccursimmediatelyafterthelinkpartners
completetraining.SSCisenabledwithinthetransmittedloopbackpattern.Ifthe
analyzerisusedtorecordtheexchange,theloopbacktrafficshouldappearinboth
upstreamanddownstreamdirections,withindividualBERTorderedsets.
Intheimagebelow,theVoyagerinitiatesloopbacktestingonahost(upstream)port.
UnchecktheHide Logical Idle Packetsoption,onthetoolbarorViewmenu.Thenusethe
LinkTrackertoverifythatthepatternistransmitted(seeFigure 12.12onpage 596)
Figure 12.12: Device Initiates Loopback Mode with SuperSpeed Host.
Theloopbacksequenceistransmittedforthedefinedintervalandautomaticallyrepeats
untiltheStopbuttonispressed.TheElectricalTestwindowautomaticallymonitorsthe
loopbackpatternsforreceivererrorsanddisplaysthefollowing:
 NumberofSymbols