alc272 Realtek Semiconductor Corporation, alc272 Datasheet - Page 33

• Manufacturer Part Number: alc272
• Description: 4 Channel High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

All power management state changes in widgets are driven by software. Table 16 shows the System
Power State Definitions.
In the ALC272, all the widgets, including output/input converters, support power control. Software may
have various power states depending on system configuration. Table 17 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) have no
individual power control to supply fine-grained power control.
4 Channel High Definition Audio Codec
Description
Audio
Function
(NID=01h)
Condition
LINK Response powered down
DACs powered down
ADCs powered down
Headphone Driver powered down
Mixers powered down
Reference power down
D3 (No BitCLK)
Power States
D0
D1
D2
D3
LINK Response
DACs
ADCs
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.
Power still supplied, BITCLK stopped, and Reset in low state.
Table 16. System Power State Definitions
Table 18. Powered Down Conditions
Table 17. Power Controls in NID 01h
Description
Internal clock is stopped. SDATA-IN and SPDIF-OUT are floated with pulled
low 47K resistors internally. SPDIF-IN is also floated. Detection of ‘Link Reset
Entry’ and ‘Link Reset Exit’ sequences are supported. All states are maintained if
DVDD is supplied.
Analog block and digital filter are powered down.
Analog block and digital filter are powered down. Data on SDATA-IN is quiet.
All headphone drivers are powered down.
All internal mixer widgets are powered down. The DC reference and
VREFOUTx at individual pin complexes are still alive.
All internal references, DC reference, and VREFOUTx at individual pin
complexes are off.
Normal
Normal
Normal
Normal
Normal
Normal
D0
Normal
Normal
Normal
Normal
PD
PD
D1
25
Normal
PD
PD
PD
PD
PD
D2
PD
PD
PD
PD
PD
PD
D3
Track ID: JATR-1076-21
D3 (No bclk)
PD
PD
PD
PD
PD
PD
Link Reset
Datasheet
Normal
Normal
Normal
ALC272
PD
PD
PD
Rev. 1.0