參數(shù)資料
型號: GL850
廠商: Electronic Theatre Controls, Inc.
英文描述: USB 2.0 4-PORT HUB Controller
中文描述: 個USB 2.0 4端口集線器控制器
文件頁數(shù): 34/40頁
文件大?。?/td> 382K
代理商: GL850
GL850 USB 2.0 4-Port HUB Controller
2000-2003 Genesys Logic Inc.—All rights reserved.
Page 34
5.4.2.4 Interface Descriptor
Interface Descriptor follows Configuration Descriptor for GET_DESCRIPTOR (CONFIGURATION)
command.
Table 5.18 - Interface Descriptor for High Speed
Offset
Field
Value
Description
I/O
Configuratio
n
EEPROM
Configuratio
n
0
bLength
09h
9 bytes for this descriptor
-
-
1
bDescriptorType
04h
Interface descriptor type
-
-
2
bIerfaceNumber
00h
Interface number
-
-
3
bAlternateSetting
00h
Alternate setting
-
-
4
bNumEndpoints
01h
Number of endpoints
-
-
5
bInterfaceClass
09h
Hub class code
-
-
6
bInterfaceSubClass
00h
Subclass code
-
-
7
bInterfaceProtocol
00h
Single TT
-
-
8
iInterface
00h
Index of string descriptor
-
-
5.4.2.5 Endpoint Descriptor in Configuration Descriptor
bInterval of High Speed Interface Descriptor is 0Ch, which is different from that of Full Speed Endpoint
Descriptor.
Table 5.19 - Endpoint Descriptor for High Speed
Offset
Field
Value
Description
I/O
Configuration
EEPROM
Configuration
0
bLength
07h
7bytes for this descriptor
-
-
1
bDescriptorType
05h
Endpoint descriptor type
-
-
2
bEpointAddress
81h
Address of the endpoint
-
-
3
bAttribute
03h
Interrupt endpoint
Max. packet size of the
endpoint
Polling interval =
(2
12
-1) X 125 us
-
-
4
wMaxPacketSize
01h
-
-
6
bInterval
0Ch
-
-
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