alc880 Realtek Semiconductor Corporation, alc880 Datasheet - Page 30

• Manufacturer Part Number: alc880
• Description: 7.1 Channel High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

7.5. Power Management
Wake-Up events are not supported when in low-power mode. All power management state changes in
widgets are driven by software. Table 14 shows the System Power State Definitions.
Only the audio function (NID=01h) and widgets of output/input converters (NID=02h~05h, 06h~08h)
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 whole codec power states through the audio function (NID=01h). Output converters (DACs)
and input converters (ADCs) also have individual power control to supply fine-grained power control.
Software can power-down individual converters when they are not being used.
7.1 Channel High Definition Audio Codec
Item
Audio Function
(NID=01h)
Output Converters
(NID=02h~05h)
Input Converters
(NID=07h~09h)
Note: PD=Powered Down
Power States
D3 (Cold)
D3 (Hot)
D0
D1
D2
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
Description
LINK Response
Front DAC
Surr DAC
Cen/Lfe DAC
Surr Back DAC
MIC ADC
LINE ADC
MIX ADC
All Headphone
Drivers
All Mixers
All Reference
Front DAC
Surr DAC
Cen/Lfe DAC
Surr Back DAC
MIC ADC
LINE ADC
MIX ADC
Table 15. Power Controls in NID is 01h, 02h~05h, 07h~09h
Table 14. System Power State Definitions
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
D0
20
Normal
Normal
Normal
Normal
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
D1
Normal
PD
PD
PD
PD
PD
PD
PD
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
PD
PD
PD
PD
PD
PD
PD
D3
ALC880 Series
Link Reset
Datasheet
Normal
Normal
Normal
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
PD
Rev. 1.4