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參數(shù)資料
| 型號： | CM108 |
| 廠商： | C-Media Electronics Inc. |
| 英文描述： | USB Audio I/O Controller |
| 中文描述： | USB音頻I / O控制器 |
| 文件頁數(shù)： | 13/29頁 |
| 文件大?。?/td> | 514K |
| 代理商： | CM108 |
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CM108
Integration Dual DAC, Earphone Driver, ADC,
Microphone Booster, PLL, Regulator, and USB Transceiver
Date: Nov/01/2004
Version: 1.5
- 19 -
7.4 Internal Registers
All internal registers of CM108 can be accessed via generic HID functional calls without
the need to develop kernel mode driver. Totally 4 bytes of data can be read or write from HID.
Input report is for read and output report is for write. Internal registers of CM108 are used to
control GPIO, S/PDIF output, and EEPROM data access.
HID_IR0 (HID input report byte 0)
Offset : 0x00
Bits
Read/Write
Description
Default
7-6
R
00: HID_IR1 is used as GPI
10: Values written to HID_IR0-3 are also
mapped to EEPROM_DATA0-1,
EEPROM_CTRL
Others: Reserved
0x0
5-4
R
Reserved
0x0
3
R
0: No activity on Record-Mute button
1: Record-Mute button pressed then released
0x0
2
R
0: No activity on Playback-Mute button
1: Playback-Mute button pressed then
released
0x0
1
R
0: Volume-Down button released
1: Volume-Down button pressed
0x0
0
R
0: Volume-Up button released
1: Volume-Up button pressed
0x0
HID_IR1 (HID input report byte 1)
Offset : 0x01
Bits
Read/Write
Description
Default
7-0
R
When HID_IR0[7:6] == 2’b00:
HID_IR1[3:0] is the input from GPIO4 ~
GPIO1 in input mode
When HID_OR0[7] == 1’b1:
Mapped from EEPROM_DATA0
0x00
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