CM108 Datasheet, PDF (19/29 Pages) C-Media Electronics – USB Audio I/O Controller

CM108
Integration Dual DAC, Earphone Driver, ADC,
Microphone Booster, PLL, Regulator, and USB Transceiver
HID Descriptor
Offset
Field
0
bLength
1 bDescriptorType
2
bcdHID
4
bCountryCode
5 bNumDescriptors
6 bDescriptorType
Size
1
1
2
1
1
1
7 wDescriptorLength 2
Value (Hex)
Description
09
Total 9 Bytes
21
HID Descriptor Type
0100 HID class version 1.00
00
01
22
Report Descriptor
0030
Numeric expression that is the total size
of the optional descriptor: 48 Bytes
Interrupt IN Endpoint Descriptor
Offset
Field
Size Value (Hex)
Description
0
bLength
1
07
Total 7 Bytes
1 bDescriptorType 1
05
ENDPOINT Descriptor Type
2 bEndpointAddress 1
83
IN Endpoint
Endpoint number = 3
3
bmAttributes
1
03
Interrupt endpoint type
4 wMaxPacketSize 2
0004 Maximum packet size: 4 bytes
6
bInterval
1
20
32ms
7.2.5 Windows Software Architecture for HID
Applications
Winmm.dll
User32.exe or User.exe
Direct Input
C-Media SDK
HID.dll
Reports
(device specification)
Keyboard Class Driver
Joy Stick Class Driver
Mouse Class Driver
Audio Driver
HID Class Driver(HIDCLASS.SYS)
Gameport MiniDriver(HIDGAME.SYS) USB
Gameport
USB HUB Driver(USBHUB.SYS)
USB Class Driver(USBD.SYS)
PCI Enumerator
Note: Please contact with our sales for the C-Media SDK example if needed.
Date: Nov/01/2004
- 18 -
Version: 1.5