GL850 View Datasheet(PDF) - Genesys Logic
Part Name
Description
MFG CO.
'GL850' PDF : 40 Pages View PDF
GL850 USB 2.0 4-Port HUB Controller
5.4.1.2 Device Qualifier Descriptor
Hub returns Device Qualifier Descriptor when GET_DESCRIPTOR (DEVICE_QUALIFIER) command is
issued from host.
Table 5.5 - Device Qualifier for Full Speed
Offset
Field
Value
Description
I/O
EEPROM
Configuration Configuration
0 bLength
0Ah 10 bytes for this descriptor
-
-
1 bDescriptorType
06h
Device qualifier descriptor
type
-
-
2 bcdUSB
0200h USB2.0 compliance
-
-
4 bDeviceClass
09h Hub class code
-
-
5 bDeviceSubClass
00h Subclass code
-
-
6 bDeviceProtocol
01h Single TT
-
-
7 bMaxPacketSize0
40h
Max. packet size for
endpoint0 of other speed
-
-
8
bNumConfigurations
01h
Number of other speed
config.
-
-
9 bReserved
00h Reserved for future use
-
-
5.4.1.3 Configuration Descriptor
When host issues GET_DESCRIPTOR (CONFIGURATION) command to the hub, hub will return
Configuration Descriptor, Interface Descriptor, and Endpoint Descriptor in combination to the host.
Table 5.6 - Configuration Descriptor for Full Speed
Offset
Field
0 bLength
1 bDescriptorType
2 wTotalLength
4 bNumberInterface
5 bConfigurationValue
6 iConfiguration
7 bmAttribute
8 bMaxPower
Value
Description
09h 9 bytes for this descriptor
02h
Configuration descriptor
type
0019h Total 25 bytes
I/O
EEPROM
Configuration Configuration
-
-
-
-
-
-
01h Number of interfaces
-
-
01h Configuration value
-
-
00h Index of string descriptor
-
-
E0h
Can switch between
power and bus power
self
-
-
32h Max. power = 100 mA
-
-
©2000-2003 Genesys Logic Inc.—All rights reserved.
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