參數(shù)資料
型號: CM109
廠商: C-Media Electronics Inc.
英文描述: USB I/O Controller
中文描述: 的USB I / O控制器
文件頁數(shù): 8/36頁
文件大小: 618K
代理商: CM109
CM109
High Integration / Low Cost USB Audio Controller
for PC Internet Phone
Date: 08/Sep/2005
Version:
1.3a
- 15 -
7.3.1 HID Descriptor
HID Interface Descriptor
Offset
Field
Size
Value (Hex)
Description
0
bLength
1
09
Size of this descriptor: 9 byte
1
bDescriptorType
1
04
INTERFACE descriptor type
2
bInterfaceNumber
1
03
Number of Interface: 3
3
bAlternateSetting
1
00
alternate 0
4
bNumEndpoints
1
01
Number of endpoints used by this
Interface: 1
5
bInterfaceClass
1
03
HID Interface Class
6
bInterfaceSubClass
1
00
No Subclass
7
bInterfaceProtocol
1
00
Must be set to 0
8
iInterface
1
00
Index of a string descriptor that
describes this interface.
HID Descriptor
Offset
Field
Size
Value (Hex)
Description
0
bLength
1
09
Total 9 Bytes
1
bDescriptorType
1
21
HID Descriptor Type
2
bcdHID
2
0100
HID class version 1.00
4
bCountryCode
1
00
5
bNumDescriptors
1
01
6
bDescriptorType
1
22
Report Descriptor
7
wDescriptorLength
2
0030
Numeric expression that is the total size
of the optional descriptor: 48 Bytes
Interrupt IN Endpoint Descriptor
Offset
Field
Size
Value (Hex)
Description
0
bLength
1
07
Total 7 Bytes
1
bDescriptorType
1
05
ENDPOINT Descriptor Type
2
bEndpointAddress
1
83
IN Endpoint
Endpoint number = 3
3
bmAttributes
1
03
Interrupt endpoint type
4
wMaxPacketSize
2
0004
Maximum packet size: 4 bytes
6
bInterval
1
20
32ms
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