Data Sheet

USBProtocolSuiteUserManual 559
FormatofTrafficGenerationFiles TeledyneLeCroyCorporation
device_pid pidstring Usethisasthefirstkeyofmostpacketssentby
adevice.
Thekeyshouldbeassignedtoavalidpacket
identifierstringpertheUSBspecification:
DATA0,DATA1,ACK,NAK,STALL,NYET,DATA2,
MDATA,EXT,orLPM.
Normally,thedevice_pid=statementisNOT
presentinaHostGeneration.utgfile,because
thedeviceresponsesareintendedtocome
fromrealdevices.Bydefault,HostGeneration
filesexportedfromTraceFilesdoNOTinclude
device_pid=statements.
Warning:IfyouspecifyPID=0xNN,youmust
useraw_data=()tospecifytherestofthe
packetdata,becausethepacketstructureis
unknown.
frame 11bits
or
AUTO
AUTONUMBER
KEEP_ALIVE
Createsastartofframepacketandgeneratesa
SOF PIDasexpected.
Thekeyshouldbeassignedavalueoftheframe
number,AUTO,AUTONUMBER,orKEEP_ALIVE.
Note:Anexplicitframenumberissupported
onlywhenthegeneratorisin"Bitstream
Mode".
AUTOinstructsthegeneratortoincrementthe
framenumberautomatically.AUTONUMBERis
exactlythesameasAUTO.Customersrequested
thisstringtomakeiteasiertounderstand.They
aretreatedidentically.
KEEP_ALIVEinstructstheAnalyzertogeneratea
low‐speedEOPinplaceofaSOFpacketfor
trafficonalow‐speedbranch
(file_speed=LOW).
ForDeviceEmulation,thisstatementisignored
bytheDeviceEmulator,butservestoorganize
the.utgfileinamorereadablemanner.
TABLE 11.3: Support Keys for Defining Fields within a packet. (Continued)
Key Code Format Description