ASAHI KASEI
[AK4571]
3. デスククリプタ詳細
Device Descriptor
Field
3.1.
Offset
Size Value
Description
0
1
2
bLength
bDe scriptorType
BcdUSB
1
1
2
0x12
0x01
0x0110
Size of this descriptor in bytes
DEVICE descriptor
1.10 - current revision of USB spec.
4
5
6
7
8
10
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
IdVendor
1
1
1
1
2
2
0x00
0x00
0x00
0x08
0x0556
0x000 4
Device defined at Interface level
Unused
Unused
8 bytes
AKM’s Vendor ID
Upper 00 means Audio Product
Lower 04 means AKM product ID
Device release code
“ AKM ”
“ AK4571”
Unused
One configuration
IdProduct
12
14
15
16
17
bcdDevice
IManufacturer
Iproduct
ISerialNumber
bNumConfigurations
2
1
1
1
1
0x0100
0x01
0x02
0x00
0x01
Table Device Descriptor
3.2.
Configuration Descriptor
Offset
Field
Size
Value
Description
0
1
2
Blength
bDescriptorType
WTotalLength
1
1
2
0x09
0x02
0x011C
Size of this descriptor
CONFIGURATION descriptor
length of entire configuration block
total 284 bytes including this interface
descriptor.
4
5
6
7
8
BnumInterfaces
bConfigurationValue
IConfiguration
BmAttributes
1
1
1
1
1
0x0 4
0x01
0x00
0x80
0x31
Four interfaces
index of this configuration
null string
supports Bus Powered Device
98mA
MaxPower
MS0153-J-02
2003/3
- 25 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
