CM6571 Datasheet, PDF (23/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

CM6571
USB Audio Sound Chip
11
iTerminal
1
00
Index of string descriptor describing this Input Terminal
class-specific input terminal descriptor (microphone), ID=02
Offset
Field
Size Value (Hex)
Description
0
bLength
1
0C
Descriptor length
1
bDescriptorType
1
24
CS_INTERFACE descriptor type
2
bDescriptorSubtype 1
02
OUTPUT_TERMINAL descriptor subtype
3
bTerminalID
1
02
Terminal ID
4
wTerminalType
2
0201 Terminal Type: Microphone
6
bAssocTerminal
1
00
Associate Terminal
7
bNrChannels
1
02
Number of channel Stereo : 02
8
wChannelConfig
2
0003
D0: Left Front (L)
D1: Right Front (R)
10
iChannelNames
1
00
Index of string descriptor describing the name of the
first logical channel
11
iTerminal
1
00
Index of string descriptor describing this Input Terminal
class-specific output terminal descriptor (speaker),ID=03
Offset
Field
Size Value (Hex)
Description
0
bLength
1
09
Descriptor length
1
bDescriptorType
1
24
CS_INTERFACE descriptor type
2
bDescriptorSubtype 1
03
OUTPUT_TERMINAL descriptor subtype
3
bTerminalID
1
03
Terminal ID
4
wTerminalType
1
0301 Terminal Type: Speaker
5
bAssocTerminal
1
00
Associate Terminal
6
bSourceID
1
05
Source ID: 05
8
iTerminal
1
00
Index of string descriptor describing this Output
Terminal
class-specific output terminal descriptor (USB stream), ID=04
Offset
Field
Size Value (Hex)
Description
0
bLength
1
09
Descriptor length
1
bDescriptorType
1
24
CS_INTERFACE descriptor type
2
bDescriptorSubtype 1
03
OUTPUT_TERMINAL descriptor subtype
3
bTerminalID
1
04
Terminal ID
4
wTerminalType
2
0101 Terminal Type: USB Stream
6
bAssocTerminal
1
00
Associate Terminal
7
bSourceID
1
08
Source ID: 08
8
iTerminal
1
00
Index of string descriptor describing this Output
Terminal
class-specific feature unit descriptor (speaker playing) , ID=05
Offset
Field
Size Value (Hex)
Description
0
bLength
1
0A
Descriptor length
1
bDescriptorType
1
24
CS_INTERFACE descriptor type
2
bDescriptorSubtype 1
06
FEATURE_UNIT descriptor subtype
3
bUnitID
1
05
Unit ID
4
bSourceID
1
09
Source ID from Input Unit: 09
5
bControlSize
1
01
Size in byte of bmaControls array: 1 bytes
6
bmaControls(1)
1
01
master mute 01
7
bmaControls(2)
1
02
Left Front volume control
02 : stereo
8
bmaControls(3)
1
02
Right Front volume control
02 : stereo
9
iFeature
1
00
Index of string descriptor describing this Feature Unit
Revised: Nov. 2012
Page 23 / 63
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