
EZ-USB FX2 Technical Reference Manual
B - 12 EZ-USB FX2 Technical Reference Manual v2.1
Table B-2 Device Qualifier
Offset Field Description Value
0 bLength Length of this Descriptor = 10 bytes 0AH
1 bDescriptorType
Descriptor Type =
Device Qualifier
06H
2 bcdUSB (L) USB Specification Version 2.00 (L) 00H
3 bcdUSB (H) USB Specification Version 2.00 (H) 02H
4 bDeviceClass Device Class (FF is vendor-specific) FFH
5 bDeviceSubClass Device Sub-class (FF is vendor-specific) FFH
6 bDeviceProtocol Device Protocol (FF is vendor-specific) FFH
7 bMaxPacketSize0 Maximum Packet Size for other speed = 64 bytes 40H
8 bNumConfigurations Number of other Configurations = 1 01H
9 bReserved Must be set to Zero 00H
Table B-3 Configuration Descriptor
Offset Field Description Value
0 bLength Length of this Descriptor = 9 bytes 09H
1 bDescriptorType
Descriptor Type =
Configuration
02H
2 wTotalLength (L) Total length (L) including Interface and Endpoint descriptors
(171 total)
ABH
3 wTotalLength (H) Total Length (H) 00H
4 bNumInterfaces Number of Interfaces in this Configuration 01H
5 bConfigurationValue Configuration value used by Set_Configuration Request to
select this interface
01H
6 iConfiguration Index of String Describing this Configuration = None 00H
7 bmAttributes Attributes - Bus Powered, No Wakeup 80H
8 MaxPower Maximum Power - 100 ma 32H
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