CM108 Datasheet, PDF (21/29 Pages) C-Media Electronics – USB Audio I/O Controller

CM108
Integration Dual DAC, Earphone Driver, ADC,
Microphone Booster, PLL, Regulator, and USB Transceiver
HID_IR2 (HID input report byte 2)
Offset : 0x02
Bits Read/Write
Description
7-0
R
When HID_OR0[7] == 1’b1:
Mapped from EEPROM_DATA1
Default
0x00
HID_IR3 (HID input report byte 3)
Offset : 0x03
Bits Read/Write
Description
7-0
R
When HID_OR0[7] == 1’b1:
Mapped from EEPROM_CTRL
Default
0x00
HID_OR0 (HID output report byte 0)
Offset : 0x04
Bits Read/Write
Description
Default
7-6
R / W 0: HID_OR1-2 are used for GPO;
0x0
HID_OR0, 3 are used for SPDIF
1: Reserved
2: Values written to HID_OR0-3 are also
mapped to EEPROM_DATA0-1,
EEPROM_CTRL (See Note)
3: Reserved
5
R / W Reserved
0x0
4
R / W When HID_OR0[7] == 1’b0:
0x0
Valid bit in SPDIF frame
When HID_OR0[7] == 1’b1:
Reserved
3-0
R / W When HID_OR0[7] == 1’b0:
0x0
First nibble of SPDIF status channel
When HID_OR0[7] == 1’b1:
Reserved
Note 1: When EEPROM access is done, HID interrupt will occur. USB host can get the result
from interrupt pipe (endpoint 3).
Note 2: HID_OR0 is used for SPDIF when SPDIF_CONFIG[5] == 1’b0
Date: Nov/01/2004
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Version: 1.5