CM119B
USB Audio Single Chip
5 USB Topology
The CM119B supports headset and speaker topology that can be selected by MODE pin. The topology
setting as follows: MODE=0, Headset Topology
MODE=1, Speaker Topology
5.1 Headset Topology
0X09
FEA
0X0F
MIXER
0X06
OT
0X01
IT
0X0D
FEA
0X02
IT
0X0A
FEA
0X07
OT
0X08
SEL
5.1.1 Device Descriptor
Offset
Field
Size
1
1
2
1
1
1
1
2
Value (Hex)
Description
0
1
2
bLength
bDescriptorType
bcdUSB
12
01
0110
00
00
00
Total 18 Bytes
Device descriptor
USB 1.1 compliant
4
5
6
7
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
Device class specified by interface
Device subclass specified by interface
Device protocol specified by interface
Endpoint zero Size = 8 bytes
Vendor ID
8
8
0d8c
0013
10
idProduct
2
Product ID
Device compliant to the Audio Device Class specification
version 1.00
Index of string descriptor that characterizes the
manufacturer
12
14
15
bcdDevice
2
1
1
0100
01
iManufacturer
iProduct
02
Index of string descriptor that characterizes the product
iSerialNumber
Index of string descriptor that characterizes the device’s
serial number
Configurations number = 1
16
17
1
1
00
01
bNumConfigurations
5.1.2 Configuration Descriptor
Offset
Field
Size
1
1
Value (Hex)
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
1
bLength
bDescriptorType
wTotalLength
09
02
XXXX
2
2
bNumInterfaces
4
1
04
0: control interface
2: ISO-IN interface
Configuration value
1: ISO-OUT interface
3: INT-IN(HID) interface
5
6
bConfigurationValue
iConfiguration
1
1
01
00
Index of string descriptor that characterizes this
configuration
Page 9 / 29 www.cmedia.com.tw
Revised: Aug. 2013 Copyright© C-Media Electronics Inc.
CMEDIA [ C-MEDIA ELECTRONICS ]
