CM6500B Datasheet, PDF (13/36 Pages) C-Media Electronics – USB Audio Sound Chip

CM6500 / CM6500B
USB Audio Sound Chip
6 USB Audio Topology
CM6500 / CM6500B supports 4 types of topology by default. They are Headset, Docking, Speaker, Mic.
Different topology can be selected by pin Mode_0 and Mode_1. The combinations are as below.
MODE_1= 0, MODE_0= 0 for Headset
MODE_1= 0, MODE_0= 1 for Microphone
MODE_1= 1, MODE_0= 0 for Speaker
MODE_1= 1, MODE_0= 1 for Docking
6.1 Headset Topology
0x01
IT
USB STREAM
0x07
FEA
0x02
IT
MIC
0x09
MIXER
0x06
FEA
0x05
FEA
0x03
OT
SPEAKER
0x08
SEL
0x04
OT
USB STREAM
Device Descriptor
Offset
0
1
2
4
5
6
7
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
8
idVendor
10
idProduct
12
bcdDevice
14
iManufacturer
15
iProduct
16
iSerialNumber
17
bNumConfigurations
Size
1
1
2
1
1
1
1
2
2
2
1
1
1
1
Value (Hex)
Description
12
Descriptor length
01
Device Descriptor
0110 USB 1.1 compliant
00
Device class specified by interface
00
Device subclass specified by interface
00
Device protocol specified by interface
10
Endpoint zero packet size
0D8C Vendor ID
0178~017F Product ID
0000 Device release number
01
Index of string descriptor describing manufacturer
02
Index of string descriptor describing product
00
Index of string descriptor describing serial number
01
Number of configuration
www.cmedia.com.tw
Copyright © C-Media Electronics Inc.
Rev. 1.02 ︱ Page 13/16