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6.9.1USB-MODEVMProtocol
KitOperation
www.ti.com
Figure16.Help
TheactualUSBprotocolusedaswellasinstructionsonwritingscriptsaredetailedinthefollowing
subsections.Whileitisnotnecessarytounderstandoruseeithertheprotocolorthescriptsdirectly,
understandingthemmaybehelpfultosomeusers.
TheUSB-MODEVMisdefinedtobeaVendor-Specificclass,andisidentifiedonthePCsystemasan
NI-VISAdevice.BecausetheTAS1020hasseveralroutinesinitsROMwhicharedesignedforusewith
HID-classdevices,HID-likestructuresareused,eventhoughtheUSB-MODEVMisnotanHID-class
device.DatapassesfromthePCtotheTAS1020usingthecontrolendpoint.
DataissentinanHIDSETREPORT(seeTable7):
Table7.USBControlEndpoint
HIDSETREPORTRequest
PARTVALUEDESCRIPTION
bmRequestType0x2100100001
bRequest0x09SET_REPORT
wValue0x00don'tcare
wIndex0x03HIDinterfaceisindex3
wLengthcalculatedbyhost
DataDatapacketasdescribed
below
TLV320AIC12KEVMB-KandTLV320AIC14KEVMB-KUser'sGuide 22SLAU229B–October2007–RevisedAugust2008
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