
Appendix A A - 1
Appendix A
Default Descriptors for Full Speed Mode
Tables A-1 through A-25 show the descriptor data built into the FX2 logic. The tables are presented
in the order that the bytes are stored.
The Device Descriptor specifies a MaxPacketSize of 64 bytes for endpoint 0, contains Cypress
Semiconductor Vendor, Product and Release Number IDs, and uses no string indices. Release
Number IDs (XX and YY) are found in individual Cypress Semiconductor data sheets. The FX2
logic returns this information response to a “Get_Descriptor/Device” host request.
Table A-1 Default USB Device Descriptor
Offset Field Description Value
0 bLength Length of this Descriptor = 18 bytes 12H
1 bDescriptorType
Descriptor Type =
Device
01H
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 EP0 =
64 bytes
40H
8 idVendor (L) Vendor ID (L) Cypress Semi = 04B4H B4H
9 idVendor (H) Vendor ID (H) 04H
10 idProduct (L) Product ID (L) EZ-USB = 8613H 13H
11 idProduct (H) Product ID (H) 86H
12 bcdDevice (L) Device Release Number (BCD,L) (see individual data sheet) xxH
13 bcdDevice (H) Device Release Number (BCD,H) (see individual data sheet) xxH
14 iManufacturer Manufacturer Index String = None 00H
15 iProduct Product Index String = None 00H
16 iSerialNumber Serial number Index String = None 00H
17 bNumConfigurations Number of Configurations in this Interface = 1 01H
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