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Philips Semiconductors
ISP1521
Hi-Speed USB hub controller
Product data Rev. 03 — 24 November 2004 26 of 53
9397 750 13702
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
[1] Value in units of 2 mA.
Table 16: Device_qualifier descriptor
Offset
(bytes)
Field name Value (hex) Comments
Full-speed High-speed
0 bLength 0A 0A descriptor length = 10 bytes
1 bDescriptorType 06 06 type = DeviceQualifierType
2 bcdUSB 00 00 see USB specification Rev. 2.0
30202
4 bDeviceClass 09 09 HUB_CLASSCODE
5 bDeviceSubClass 00 00 HubSubClassCode
6 bDeviceProtocol 00 01 HubProtocolHSpeedOneTT
7 bMaxPacketSize0 40 40 packet size = 64 bytes
8 bNumConfigurations 01 01 number of configurations
Table 17: Other_speed_configuration descriptor
Offset
(bytes)
Field name Value (hex) Comments
Full-speed High-speed
0 bLength 09 09 descriptor length=9bytes
1 bDescriptorType 07 07 type = OtherSpeedConfigurationType
2 wTotalLength 19 19 TotalConfByte
30000
4 bNumInterfaces 01 01 -
5 bConfigurationValue 01 01 -
6 iConfiguration 00 00 no string supported
7 bmAttributes E0 E0 self-powered
A0 A0 others
8 bMaxPower 00 00 self-powered
Table 18: Configuration descriptor
Offset
(bytes)
Field name Value (hex) Comments
Full-speed High-speed
0 bLength 09 09 descriptor length=9bytes
1 bDescriptorType 02 02 type = CONFIGURATION
2 wTotalLength 19 19 total length of configuration, interface and endpoint
descriptors = 25 bytes
30000
4 bNumInterfaces 01 01 one interface
5 bConfigurationValue 01 01 configuration value = 1
6 iConfiguration 00 00 no configuration string descriptor
7 bmAttributes E0 E0 self-powered
8 bMaxPower
[1]
00 00 self-powered