CM108 查看數據表（PDF） - Unspecified

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CM108

High Integrated USB Audio I/O Controller

Unspecified 

CM108

Integration Dual DAC, Earphone Driver, ADC,

Microphone Booster, PLL, Regulator, and USB Transceiver

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

0x0

10: Values written to HID_IR0-3 are also

mapped to EEPROM_DATA0-1,

EEPROM_CTRL

Others: Reserved

5-4

R

Reserved

0x0

3

R

0: No activity on Record-Mute button

0x0

1: Record-Mute button pressed then released

2

R

0: No activity on Playback-Mute button

0x0

1: Playback-Mute button pressed then

released

1

R

0: Volume-Down button released

0x0

1: Volume-Down button pressed

0

R

0: Volume-Up button released

0x0

1: Volume-Up button pressed

HID_IR1 (HID input report byte 1)

Offset : 0x01

Bits Read/Write

Description

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

Default

0x00

Date: Nov/01/2004

- 19 -

Version: 1.5

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