GL850 datasheet(30/40 Pages) ETC

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GL850 USB 2.0 4-Port HUB Controller

Page 30

5.4.1.6 Other Speed Configuration Descriptor

An USB2.0 hub returns Other Speed Configuration Descriptor for the command GET_DESCRIPTOR

(OTHER_SPEED_CONFIGURATION). An USB2.0 host will issue this command when the hub plugged is

an USB2.0 hub.

Table 5.9 - Other Speed Configuration Descriptor for Full Speed

Offset

Field

Value

Description

I/O

Configuration

EEPROM

Configuration

bLength

09h

9 bytes for this descriptor

bDescriptorType

07h

Other speed descriptor

type

wTotalLength

19h

Total 25 bytes

bNumberInterface

01h

Number of interfaces

bConfigurationValue

01h

Configuration value

iConfiguration

00h

Index of string descriptor

bmAttribute

E0h

Can switch between self

power and bus power

bMaxPower

32h

Max. power = 100 mA

5.4.1.7 Interface Descriptor combined with Other Speed Configuration Descriptor

Other Speed Interface Descriptor is in combination after Other Speed Configuration Descriptor for the

command GET_DESCRIPTOR (OTHER_SPEED_CONFIGURATION).

Table 5.10 - Other Speed Interface Descriptor for Full Speed

Offset

Field

Value

Description

I/O

Configuration

EEPROM

Configuration

bLength

09h

9 bytes for this descriptor

bDescriptorType

04h

Interface descriptor type

bIerfaceNumber

00h

Interface number

bAlternateSetting

00h

Alternate setting

bNumEndpoints

01h

Number of endpoints

bInterfaceClass

09h

Hub class code

bInterfaceSubClass

00h

Subclass code

bInterfaceProtocol

00h

Single TT

iInterface

00h

Index of string descriptor

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