Data Sheet

USBProtocolSuiteUserManual 573
TransactionEngine TeledyneLeCroyCorporation
Figure 12.2: Connecting a Cable from Host under Test to Exerciser “A” Port.
12.5 Transaction Engine
TheTransactionEngineallowsVoyagerhardwaretoautomaticallyhandlelow‐level
protocolelements,forquickerresponseandhigherdatathroughput.Some
Transaction Enginefeaturesare:
 RetryUponRXNRDYTP:ExerciserautomaticallywaitsforERDYandthenretries
HeaderTPorACKTP.
 UponRXofDataburstpackets:ExerciserautomaticallysendsACKTPwith
properSEQnumberforallreceivedpackets.
 UponRXofDPwithoutoforderSEQnumber:ExercisersendsACKTPwithmiss‐
ingSEQnumberandRetrybitsetto1.
 UponRXofDPwithHostErrorbitset:Exerciser(inDeviceEmulationmode)
automaticallywaitsforERDYandthenretriespacket.
 UponRXofStreamTransferwithout‐of‐orderdatapackets:ExercisersendsACK
TPwithcorrectStreamIDandSEQnumber.
Note:FormoreinformationonthetheoryofoperationoftheTransaction Engineandtheuseofthe
Scriptinglanguage,consulttheVoyagerUSB3.1ExerciserGenerationScriptLanguageReference
Manual.
12.6 Transaction Engine
TheTransactionEngineallowsVoyagerhardwaretoautomaticallyhandlelow‐level
protocolelements,forquickerresponseandhigherdatathroughput.Some
Transaction Enginefeaturesare:
 RetryUponRXNRDYTP:ExerciserautomaticallywaitsforERDYandthenretries