
Appendix A A - 3
Table A-4 USB Default Interface 0, Alternate Setting 0
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 =
0
00H
4 bNumEndpoints
Number of endpoints in this interface (not counting EP0) =
0
00H
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 A-5 USB Default Interface 0, Alternate Setting 1
Offset Field Description Value
0 bLength Length of this Interface Descriptor 09H
1 bDescriptorType
Descriptor Type =
Interface
04H
2 bInterfaceNumber
Zero based index of this interface =
0
00H
3 bAlternateSetting
Alternate Setting Value =
1
01H
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 A-6 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 =
BULK
02H
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
)
00H
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