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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)： | 4/36頁 |
| 文件大小： | 618K |
| 代理商： | CM109 |
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CM109
High Integration / Low Cost USB Audio Controller
for PC Internet Phone
Date: 08/Sep/2005
Version:
1.3a
- 11 -
7. FUNCTION DESCRIPTIONS
7.1 USB Interface
CM109 integrates USB transceiver, PLL, and regulator so only a few passive
components are necessary for the USB interface connection. Default USB descriptors
are embedded in CM109; therefore no additional design effort is needed for a generic
USB operation. PID changes with the jumper pin setting so different setting have
different PID. For customized product, customer can attach a 93C46 EEPROM to
override the embedded VID, PID and provide addition serial number for each set.
CM109 automatically detects 93C46 existence and performs the overwrite function
during power up.
7.1.1 Device Descriptor
Offset
Field
Size
Value
(Hex)
Description
0
bLength
1
12
Total 18 Bytes
1
bDescriptorType
1
01
Device Descriptor
2
bcdUSB
2
0110
USB 1.1 compliant.
4
bDeviceClass
1
00
5
bDeviceSubClass
1
00
6
bDeviceProtocol
1
00
7
bMaxPacketSize0
1
40
Endpoint zero Size = 64 bytes
8
idVendor
2
0d8c
Vendor ID
10
idProduct
2
0008 ~
000F
Product ID
Programmable by MSEL and
MODE pin
12
bcdDevice
2
0100
Device compliant to the Audio
Device Class specification
version 1.00
14
iManufacturer
1
01
Index of string descriptor
describing manufacturer
15
iProduct
1
02
Index of string descriptor
describing product
16
iSerialNumber
1
03
Index of string descriptor
describing the device’s serial
number
17
bNumConfigurations
1
01
Configurations number = 1
Note: VID, PID, and serial number can be overridden by external EEPROM content
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