Data Sheet

TeledyneLeCroyCorporation RecordingRules‐USB2.0
288 USBProtocolSuiteUserManual
5.8.10 Counters for USB 2.0
Counter:AcountertellstheAnalyzertosearchforxinstancesoftheselectedevent.For
example,ifyouenter10,theAnalyzercounts10instancesoftheselectedeventbeforeit
performswhateveractionyouassign.CounterscannotbeappliedtoeventswithFilter
Actions.Themaximumcountervalueis65,535.
Triggerscanbesetonmultipleinstancesofanevent.Forexample,youcansetatriggerto
occurfollowingfiveinstancesofanyDLP.ToconfiguretheAnalyzertolookformultiple
events,youenableCounters.CounterstelltheAnalyzerhowmanyoccurrencesofan
eventforwhichitshouldwaitbeforetriggering.Forexample,useacountertoTrigger
followingthe16thoccurrenceofanerrororDLLPmessage.
Events and Actions
Withinevents,countersdeterminehowmanytimestheeventmustoccurbeforethe
associatedactionsaretriggered.Eventcounterstypicallyhavetwoproperties:
 CountRandomly:Canbesetto“Yes”or“No”(defaultvalueis“No”).Ifsetto
“Yes”,theeventrepeatsarandomnumberoftimes(between1andthevalueset
inthepropertyMaxRandomCount,whichreplacesthepropertyCounterValue
when“Yes”isselected),beforetheactionistriggered.
 CounterValue:NumberofrepeatsrequiredwhenCountRandomlyissetto
“No”.Thedefaultvalueis1.
Withinactions,countersdeterminehowmanytimesthesystemcallstheactionbeforeit
acts.Actioncounterstypicallyhavetwoproperties:
 Random:Canbesetto“Yes”or“No”(defaultvalueis“No”).Ifsetto“Yes”,the
actiontriggersanumberofoccurrencesbeforetheactiontakesplace.That
numberrangesrandomlybetween1andthevaluesetinthepropertyAtleast
everyNthoccurrence,whichreplacesthepropertyEveryNthoccurrencewhen
“Yes”isselected.
 EveryNthoccurrence:Numberoftimesthesystemcallstheactionbeforeit
acts.
Notethatthereissomeoverlapinthewaythesecounterscanbeused.Forexample,in
thesimplecaseofasingleeventleadingtoasingleaction,itmakesnodifference
whetheryouspecifytheeventtorequirefiverepeatsbeforetriggeringtheaction,orthe
actiontorequirefiveoccurrencesbeforeitacts.
However,inthecaseofcombinedeventsand/oractions,theseparatecountersprovide
flexibilityindesigningtestcases.Forexample,considerthecasewhereEvent_1OR
Event_2leadstoAction.IfEvent_1hasacounterof5,thentheActiontriggerseither
whenEvent_1hasrepeatedfivetimesorwhenEvent_2happensthefirsttime,
whicheveroccursfirst.
Butiftheeventcountersaresetto1andtheActioncounterissetto5,thentheAction
happensafterfiveoccurrencesofEITHEREvent_1orEvent_2.