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EZ-USB FX2 Technical Reference Manual
B - 18 EZ-USB FX2 Technical Reference Manual v2.1
Table B-19 Interface Descriptor (Alt. Setting 3)
Offset Field Description Value
0 bLength Length of the Interface Descriptor 09H
1 bDescriptorType
Descriptor Type =
Interface
04H
2 bInterfaceNumber Zero based index of this interface = 0 00H
3 bAlternateSetting Alternate Setting Value = 3 03H
4 bNumEndpoints Number of endpoints in this interface (not counting EP0) = 6 06H
5 bInterfaceClass Interface Class = Vendor Specific FFH
6 bInterfaceSubClass Interface Sub-class = Vendor Specific FFH
7 bInterfaceProtocol Interface Protocol = Vendor Specific FFH
8 iInterface Index to string descriptor for this interface = None 00H
Table B-20 Endpoint Descriptor (EP1 out)
Offset Field Description Value
0 bLength Length of this Endpoint Descriptor 07H
1 bDescriptorType
Descriptor Type =
Endpoint
05H
2 bEndpointAddress Endpoint Direction (1 is in) and address = OUT1 01H
3 bmAttributes XFR Type = INT 03H
4 wMaxPacketSize (L) Maximum Packet Size = 64 bytes 40H
5 WMaxPacketSize (H) Maximum Packet Size - High 00H
6 bInterval Polling Interval in Milliseconds (1 for iso) 01H
Table B-21 Endpoint Descriptor (EP1 in)
Offset Field Description Value
0 bLength Length of this Endpoint Descriptor 07H
1 bDescriptorType
Descriptor Type =
Endpoint
05H
2 bEndpointAddress Endpoint Direction (1 is in) and address = IN1 81H
3 bmAttributes XFR Type = INT 03H
4 wMaxPacketSize (L) Maximum Packet Size = 64 bytes 40H
5 WMaxPacketSize (H) Maximum Packet Size - High 00H
6 bInterval Polling Interval in Milliseconds (1 for iso) 01H
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