CM6327A
USB Single-Chip Audio Solution for Mono Microphone
6 USB Audio Topology and Descriptions
6.1 USB Audio Topology
FEA
SEL
IT
OT
MIC
USB STREAM
6.2
Device Descriptors
Offset
Field
bLength
Size
Value (Hex)
Description
0
1
1
1
2
1
1
1
1
2
2
2
1
1
1
1
12
01
Descriptor length
Device descriptor
USB 1.1-compliant
bDescriptorType
bcdUSB
2
0110
00
4
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
Device class specified by interface
Device subclass specified by interface
Device protocol specified by interface
Endpoint zero packet size
Vendor ID
5
00
6
00
7
10
8
0d8c
0134
0100
03
10
12
14
15
16
17
idProduct
Product ID
bcdDevice
Device release number
iManufacturer
iProduct
Manufacturer string descriptor index
Product string descriptor index
01
iSerialNumber
bNumConfigurations
00 or 03(*) Serial number string descriptor index
01 Number of configurations
Note 1: When valid EEPROM is detected, Vendor ID and Product ID will be replaced by the content of the EEPROM
Note 2: iSerialNumber will be valid only if the external EEPROM contains this info
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