AK4571 Datasheet, PDF (33/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
3.4.5. Standard Endpoint descriptor
Offset Field
Size Value
0 bLength
1 0x09
1 bDescriptorType
1 0x05
2 bendpointAddress
1 0x81
3 bmAttributes
1 0x05
4 wMaxPacketSize
2 0x0064
6 bInterval
1 0x01
7 bRefresh
1 0x00
8 bSynchAddress
1 0x00
Description
Length of this descriptor
ENDPOINT descriptor
Endpoint 1, IN direction
Isochronous, asynchronous
2byte*50sample*1ch=100 byte/frame
One packet every frame (Must be s et to 1)
Unused
Unused
3.4.6. Class-specific isochronous audio data endpoint descriptor
Offset Field
Size Value
Description
0 bLength
1 0x07
Size of this descriptor
1 bDescriptorType
1 0x25
CS_ENDPOINT
2 bDescriptorSubtype 1 0x01
EP GENERAL
3 bmAttributes
1 0x01
sample rate control
4 bLockDelayUnits
1 0x00
Unused
5 wLockDelay
2 0x0000
MS0153-J-02
- 33 -
2003/3