AK4571 Datasheet, PDF (32/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
3.4.2. Standard Interface descriptor <Alternate Setting 1> (A/D Audio Streaming Data)
Offset Field
Size Value
0 bLength
1 0x09
1 bDescriptorType
1 0x04
2 bInterfaceNumber
1 0x01
3 bAlternateSetting
1 0x01
4 bNumEndpoints
1 0x01
5 bInterfaceClass
1 0x01
6 bInterfaceSubclass
1 0x02
7 bInterfaceProtocol
1 0x00
8 iInterface
1 0x00
Description
Length of this descriptor
INTERFACE descriptor
Index of this interface
Index of this setting
1 Endpoint
AUDIO
AUDIO_STREAMING
Unused
null string
3.4.3. Class -specific audio streaming interface descriptor <Alt 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 0x02
Unit ID of terminal(Output Terminal ID)
4 bDelay
1 0x00
Interface delay
5 wFormatTag
2 0x0001
PCM
3.4.4. Type I format type descriptor
Offset Field
Size Value
0 blength
1 0x1D
1 bDescriptorType
2 bdescriptorSubtype
3 bformatType
4 bNrChannels
5 bSubFrameSize
6 bBitResolution
7 bSamFreqType
8 tSamFreq[0]
11 tSamFreq[1]
14 tSamFreq[2]
17 tSamFreq[3]
20 tSamFreq[4]
23 tSamFreq[5]
26 tSamFreq[6]
1 0x24
1 0x02
1 0x01
1 0x01
1 0x02
1 0x10
1 0x07
3 0x001F40
3 0x002B11
3 0x003E80
3 0x005622
3 0x007D00
3 0x00AC44
3 0x00BB80
Description
Size of this descriptor
CS_INTERFACE
FORMAT_TYPE
FORMAT_TYPE_I
One channel
Two bytes per slot
16 bits
Seven frequencies
8000Hz
11025Hz
16000 Hz
22050Hz
32000Hz
44100Hz
4800Hz
MS0153-J-02
- 32 -
2003/3