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Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 15 of 48
9397 750 07002
© Philips Electronics N.V. 2000. All rights reserved.
9.3 Descriptors
The ISP1122 hub controller supports the following standard USB descriptors:
•
Device
•
Configuration
•
Interface
•
Endpoint
•
Hub
•
String.
Table 10: Device descriptor
Values in square brackets are optional.
Offset
(bytes)
Field name Size
(bytes)
Value
(Hex)
Comments
0 bLength 1 12 descriptor length = 18 bytes
1 bDescriptorType 1 01 type = DEVICE
2 bcdUSB 2 10, 01
USB Specification Rev. 1.1
4 bDeviceClass 1 09 HUB_CLASSCODE
5 bDeviceSubClass 1 00 -
6 bDeviceProtocol 1 00 -
7 bMaxPacketSize0 1 40 packet size = 64 bytes
8 idVendor 2 CC, 04 Philips Semiconductors vendor ID
(04CC); can be customized using an
external EEPROM (see Tabl e 2 3)
10 idProduct 2 22, 11 ISP1122 product ID; can be
customized using an external
EEPROM (see Table 23)
12 bcdDevice 2 01, 01 device release 1.1; silicon revision
increments this value
14 iManufacturer 1 00 no manufacturer string (default)
[01] manufacturer string enabled
(using an external EEPROM)
15 iProduct 1 00 no product string (default)
[02] product string enabled
(using an external EEPROM)
16 iSerialNumber 1 00 no serial number string
17 bNumConfigurations 1 01 one configuration