AK5371A Datasheet, PDF (23/32 Pages) Asahi Kasei Microsystems – 2ch A/D Converter with USB I/F

ASAHI KASEI
[AK5371A]
4 Standard requests
4.1 Clear Feature
The AK5371A accepts “Clear Feature” request without stall. Though this request does not influence to the
operation of the device, the AK5371A does not support this request.
4.2 Get Configuration
The AK5371A returns Configuration value.
Field
Size Value
Offset
0
bmRequestType 1 0x80
1
bRequest
1 0x08
2
wValue
2 0x0000
4
wIndex
2 0x0000
6
wLength
2 0x0001
Description
GET_CONFIGURATION
AKM USB Mic. has one configuration.
4.3 Get Descriptor
Offset
0
1
2
Field
Size
bmRequestType 1
bRequest
1
wValue
2
Value
0x80
0x06
0xZZZZ
4
wIndex
6
wLength
2 0x0000
2 0xZZZZ
Description
GET_DESCRIPTOR
ZZZZ is assigned by host:
High Byte is Descriptor Type, Low Byte is Index.
DEVICE : 0x0100 : (Index is 0 only)
CONFIGURATION : 0x0200
STRING: 0x03??(?? is 00, 01, 02)
if wValue is DEVICE or CONFIGURATION, wIndex is
zero. If wValue is 0x0300(LANGID), wIndex is zero.
If wValue is 0x0301 or 0x0302, wIndex is
0x0409“English(US)”.
Descriptor Length (ZZZZ is assigned by host)
4.4 Get Interface
The AK5371A returns the current bAlternateSetting value.
Offset
0
1
2
4
6
Field
Size
bmRequestType 1
bRequest
1
wValue
2
wIndex
2
wLength
2
Value
0x81
0x0A
0x0000
0x0000
0x0001
0x0001
Description
GET_INTERFACE
ZERO
Audio Control Interface
Audio Streaming Interface
AKM USB Mic. Has zero bandwidth Audio
Streaming Interface and normal Audio Streaming
Interface.
MS0546-E-00
MS0103-E-00
23
2007/02