AK4571 Datasheet, PDF (26/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
3.3.
Interface Descriptor # 0
3.3.1. Standard Audio Control Interface Descriptor
Offset Field
Size Value
Description
0 bLength
1 bDescriptorType
1 0x09
1 0x04
Size of this descriptor
INTERFACE descriptor
2 bInterfaceNumber
1 0x00
Index of this interface
3 bAlternateSetting
1 0x00
Index of this setting
4 bNumEndpoints
1 0x00
only uses Endpoint 0
5 bInterfaceClass
1 0x01
AUDIO
6 bInterfaceSubclass
7 bInterfaceProtocol
1 0x01
1 0x00
AUDIO_CONTROL
not vendor or class specific
8 IInterface
1 0x00
null string
Table Standard Interface Descriptor
3.3.2. Class -Specific Audio Control Interface Descriptor
Offset
0
1
2
3
5
Field
Size
BLength
1
bDescriptorType
1
bDescriptorSubtype 1
BcdADC
2
wTotalLength
2
Value
0x0A
0x24
0x01
0x0100
0x0065
7 binCollection
8 baInterfaceNr(0)
9 baInterfaceNr(1)
1 0x02
1 0x01
1 0x02
Description
Size of this descriptor
CS_INTERFACE
HEADER subtype
Revision of class specification – 1.00
Total size of class-specific Audio Control
Interface descriptors 101 byte
(includes this descriptor)
The number of streaming interfaces
Streaming interface number 1 belongs to
this audio control interface. IN Interface
Streaming interface number 2 belongs to
this audio control interface. OUT Interface
MS0153-J-02
- 26 -
2003/3