Philips ISP1521 ユーザーズマニュアル
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)
(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
3
02
02
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)
(bytes)
Field name
Value (hex)
Comments
Full-speed
High-speed
0
bLength
09
09
descriptor length = 9 bytes
1
bDescriptorType
07
07
type = OtherSpeedConfigurationType
2
wTotalLength
19
19
TotalConfByte
3
00
00
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)
(bytes)
Field name
Value (hex)
Comments
Full-speed
High-speed
0
bLength
09
09
descriptor length = 9 bytes
1
bDescriptorType
02
02
type = CONFIGURATION
2
wTotalLength
19
19
total length of configuration, interface and endpoint
descriptors = 25 bytes
descriptors = 25 bytes
3
00
00
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
00
00
self-powered