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