alc888-vc2-gr Realtek Semiconductor Corporation, alc888-vc2-gr Datasheet - Page 31

• Manufacturer Part Number: alc888-vc2-gr
• Description: 7.1+2 Channel High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

7.5.
In the ALC888, all power management state changes in widgets are driven by software. Table 14 shows
the System Power State Definitions.
Note that only the ALC888-VC supports Wake-Up events when in low power mode.
All widgets, including output/input converters, support power control. Software may have various power
states depending on system configuration.
Table 15 indicates those nodes that support power management. To simplify power control, software can
configure codec power states through the audio function (NID=01h). In the ALC888-VC, output
converters (DACs) and input converters (ADCs) have no individual power control to supply fine-grained
power control.
7.5.1.
7.5.2.
7.1+2 Channel High Definition Audio Codec
Note: PD=Powered Down
Audio Function
Power States
(NID=01h)
D3 (Cold)
D3 (Hot)
Item
D0
D1
D2
Power Management
System Power State Definitions
Power Controls in NID 01h
Description
LINK Response
Front DAC
Surr DAC
Cen/LFE DAC
Side DAC
Fout DAC
LINE ADC
MIX ADC
All Headphone Drivers
All Mixers
All Reference
Definitions
All power on. Individual DACs and ADCs can be powered up or down as required.
All amplifiers and converters (DACs and ADCs) are powered down. State maintained, analog
reference stays up.
All amplifiers and converters (DACs and ADCs) are powered down. State maintained, but analog
reference is off (D1 + analog reference off).
Power still supplied. The codec stops the internal clock. State is maintained.
All power removed. State lost.
Table 14. System Power State Definitions
Table 15. Power Controls in NID 01h
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
D0
23
Normal
Normal
Normal
Normal
PD
PD
PD
PD
PD
PD
PD
D1
Normal
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
D2
Track ID: JATR-1076-21
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
D3
Link Reset
Datasheet
Normal
Normal
Normal
ALC888
PD
PD
PD
PD
PD
PD
PD
PD
Rev. 1.4