AK4571 Datasheet, PDF (34/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
3.5.
Interface Descriptor #2
3.5.1. Standard Audio Streaming Interface descriptor <Alternate Setting 0> (D/A Audio Streaming Data)
Zero Bandwidth
Offset Field
Size Value
Description
0 bLength
1 0x09
Length of this descriptor
1 bDescriptorType
1 0x04
INTERFACE descriptor
2 bInterfaceNumber
1 0x02
Index of this interface
3 bAlternateSetting
1 0x00
Index of this setting
4 bNumEndpoints
1 0x00
endpoints 0
5 bInterfaceClass
1 0x01
AUDIO
6 bInterfaceSubclass
1 0x02
AUDIO_STREAMING
7 bInterfaceProtocol
1 0x00
Unused
10 iInterface
1 0x00
null string
3.5.2. Operational Interface descriptor <Alternate Setting 1> (D/A Audio Streaming Data)
Offset Field
Size Value
Description
0 BLength
1 0x09
Length of this descriptor
1 bDescriptorType
1 0x04
INTERFACE descriptor
2 bInterfaceNumber
1 0x02
Index of this interface
3 bAlternateSetting
1 0x01
Index of this setting
4 bNumEndpoints
1 0x01
Streaming
5 bInterfaceClass
1 0x01
AUDIO
6 bInterfaceSubclass
1 0x02
AUDIO_STREAMING
7 bInterfaceProtocol
1 0x00
Unused
8 iInterface
1 0x00
null string
3.5.3. Class -specific audio streaming interface descriptor<Alternate Setting 1>
Offset Field
Size Value
Description
0 bLength
1 0x07
Length of this descriptor
1 bDescriptorType
1 0x24
CS_INTERFACE descriptor
2 bDescriptorSubtype 1 0x01
AS_GENERAL
3 bTerminalLink
1 0x03
Unit ID of Terminal(Input Terminal)
4 bDelay
1 0x00
Interface delay
5 wFormatTag
2 0x0001
PCM
MS0153-J-02
- 34 -
2003/3