Teledyne LeCroy USB File Based Decode Manual - Manual (Page 31)

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C OMPUTER A CCESS T ECHNOLOGY C ORPORATION USB D ESCRIPTOR D EFINITION (. DSC ) F ILES
Reference Manual
WordValue={
0x01=DEVICE type
0x02=CONFIGURATION type
0x04=INTERFACE type
0x05=ENDPOINT type
...
}
...
Data={
Length=?
Descriptors=TRUE
}
When wValue is 0x01 , the decoder will look for a descriptor definition with a
DescriptorType value of 0x01 . If found, the descriptor information will be
decoded and displayed in the trace output.
DescriptorSubtype
This entry is used only in conjunction with a DescriptorType entry. Its value
is the assigned subtype code. This keyword was introduced specifically to support
the descriptor format extension adopted by the Audio device class. Any other class
or vendor descriptor specification based on this extension may utilize the
DescriptorSubType keyword as well.
ClassCode
This entry is used only when the referring .req file contains GroupType=Class .
The ClassCode value is the USB-assigned class code. Its value should match the
ClassCode value in the .req file that references the descriptor definition.
Example from hub.req:
GroupName=Hub Class
GroupType=Class
ClassCode=0x09
Corresponding example from hub.dsc:
DescriptorName=HUB
DescriptorType=0x29
ClassCode=0x09