CM6571 Datasheet, PDF (28/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

CM6571
USB Audio Sound Chip
class-specific HID interface descriptor (interface 3, alternate 0)
Offset
Field
Size Value (Hex)
Description
0
bLength
1
09
Descriptor length
1
bDescriptorType
1
21
HID descriptor type
2
bcdHID
2
0100 HID class version
4
bCountryCode
1
00
No country code
5
bNumDescriptors
1
01
One HID class descriptor
6
bDescriptorType
1
22
Report Descriptor
7
wDescriptorLength 2
002C HID class descriptor length in byte: 44 bytes
standard HID interrupt in endpoint descriptor (ep 87)
Offset
Field
Size Value (Hex)
Description
0
bLength
1
07
Descriptor length
1
bDescriptorType
1
05
Endpoint Descriptor
2
bEndpointAddress 1
87
IN Endpoint, Endpoint number: 07
3
bmAttributes
1
03
Interrupt Endpoint
4
wMaxPacketSize
2
0010 Maximum packet size: 16 bytes
6
bInterval
1
01
1ms
Revised: Nov. 2012
Page 28 / 63
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