CM108B Datasheet, PDF (12/24 Pages) C-Media Electronics – A Highly Integrated USB Audio Single Chip

Offset
Field
Size
0
bLength
1
1
bDescriptorType
1
2
wTotalLength
2
4
bNumInterfaces
1
5 bConfigurationValue 1
6
iConfiguration
1
7
bmAttributes
1
8
bMaxPower
2
CM108B
USB Audio Single Chip
Value (Hex)
09
02
XXXX
04
01
00
80
32
Description
Total 9 Bytes
Configuration Descriptor
Total length of data returned for this configuration:
Programmable by MSEL and MODE pin
Number of interfaces supported by this Configuration:
0: control interface
1: ISO-OUT interface
2: ISO-IN interface
3: INT-IN(HID) interface
Configuration value
Index of string descriptor describing this configuration
Bus Power and support Remote Wakeup
Maximum power consumption of the USB Device: 100mA
7.1.2 USB audio topology diagram for speaker
0X01
IT
0X09
FEA
0X06
OT
Device Descriptor
Offset
Field
Size
0
bLength
1
1
bDescriptorType
1
2
bcdUSB
2
4
bDeviceClass
1
5
bDeviceSubClass
1
6
bDeviceProtocol
1
7
bMaxPacketSize0
1
8
idVendor
2
10
idProduct
2
12
bcdDevice
2
14
iManufacturer
1
15
iProduct
1
16
iSerialNumber
1
17 bNumConfigurations
1
Value (Hex)
12
01
0110
00
00
00
08
0d8c
0012
0100
01
02
00
01
Description
Descriptor length
Device Descriptor
USB 1.1 compliant
Device class specified by interface
Device subclass specified by interface
Device protocol specified by interface
Endpoint zero packet size
Vendor ID
Product ID
Device release number
Index of string descriptor describing manufacturer
Index of string descriptor describing product
Index of string descriptor describing serial number
Number of configuration
Configuration Descriptor
Offset
Field
Size
0
bLength
1
1
bDescriptorType
1
2
wTotalLength
2
4
bNumInterfaces
1
5 bConfigurationValue
1
6
iConfiguration
1
7
bmAttributes
1
8
bMaxPower
1
Value (Hex)
09
02
XXXX
03
01
00
80
32
Description
Descriptor length
Configuration Descriptor
Total length of data returned for this configuration:
Programmable by MSEL and MODE pin
Number of interfaces supported by this Configuration:
00: Control
01: ISO-Out
02: INT-IN (HID)
Configuration value
Index of string descriptor describing this configuration
Attributes(PWRSEL=0:Bus Powered, 1:SELF Powered)
Maximum power consumption from bus = 100mA
Datasheet Revision: 1.11
Page 12 / 24
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