AK4571 Datasheet, PDF (39/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
4. standard Device Request
4.1.
Clear Feature
AK4571
ACK
Offset Field
Size Value
0
bmRequestType
1 0x00
0x02
1
bRequest
1 0x01
2
wValue
2 0x0000
0x0001
4
wIndex
2 0x0000
6
wLength
2 0x000
Description
Device
Endpoint
CLEAR_FEATURE
clear ENDPONT0 HALT
clear REMOTE_WAKEUP
4.2.
Get Configuration
AK4571
1
Offset Field
Size
0
bmRequestType
1
1
bRequest
1
2
wValue
2
4
wIndex
2
6
wLength
2
”1”
Value
0x80
0x08
0x0000
0x0000
0x0001
Description
GET_CONFIGURATION
4.3.
Get Descriptor
Descriptor
Offset Field
Size
0
bmRequestType
1
1
bRequest
1
2
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 Desc. type, Low Byte is Index.
DEVICE : 0x0100 : (Index is 0 only)
CONFIGURATION : 0x0200
Descriptor Length (ZZZZ is assigned by host)
4.4.
Get Interface
AK4571
#2 Alt0,Alt1
Offset Field
0
bmRequestType
1
bRequest
2
wValue
4
wIndex
6
wLength
Interface
Alternate Setting
Iterface #1, Interface
Interface #0, Interface #3 Alt0
Size Value
Description
1 0x81
1 0x0A
2 0x0000
GET_INTERFACE
ZERO
2 0x0000
0x0001
0x0002
0x0003
Audio Control Interface
Audio Streaming Interface for A/D
Audio Streaming Interface for D/A
HID Interface
2 0x0001
AK4571 has zero bandwidth Audio Streaming Interface and
normal Audio Streaming Interface.
MS0153-J-02
- 39 -
2003/3