92HD66B Datasheet, PDF (17/286 Pages) Integrated Device Technology – FOUR CHANNEL HD AUDIO CODECS

92HD66B
FOUR CHANNEL HD AUDIO CODECS WITH DUAL CAPLESS HEADPHONE AMPLIFIERS
2.9. Power Management
The HD Audio specification defines power states, power state widgets, and power state verbs.
Power management is implemented at several levels. The Audio Function Group (AFG) , all con-
verter widgets, and all pin complexes support the power state verb F05/705. Converter widgets are
active in D0 and inactive in D1-D3.
The following table describes what functionality is active in each power state.
Function
D0
D1¹
D2
Vendor
Vendor
D3
D3cold _{Specific D42 SpecificD52}
SPDIF Outputs
On
On
On
(idle)
On (idle)⁶
Off
Off
Off
SPDIF Input
On
Off
Off
Off
Off
Off
Off
Digital Microphone inputs
On
Off
Off
Off
Off
Off
Off
DAC
On
Off
Off
Off
Off
Off
Off
D2S
On
Off
Off
Off
Off
Off
Off
ADC
On
Off
Off
Off
Off
Off
Off
ADC Volume Control
On
Off
Off
Off
Off
Off
Off
Ref ADC
On
Off
Off
Off
Off
Off
Off
Analog Clocks
On
Off
Off
Off
Off
Off
Off
GPIO pins
On
On
On
On⁶
On
On
Off
VrefOut Pins
On
On
Off
Off
Off
Off
Off
Input Boost
On
On
Off
Off
Off
Off
Off
Analog mixer
On
On
Off
Off
Off
Off
Off
Mixer Volumes
On
On
Off
Off
Off
Off
Off
Analog PC_Beep
Digital PC_Beep
Lo/HP Amps
VAG amp
Port Sense
On
On
On
On
Off
Off
Off
On
On
On
On⁶
Off
Off
Off
On
On
On Low Drive³ Low Drive³ Low Drive³
Off
On
On
On Low Drive⁴ Low Drive Low Drive
Off
On
On
On
On⁵
Off
Off
Off
Reference Bias generator
On
On
On
On
On
On
Off
Reference Bandgap core
On
On
On
On
On
On
Off
HD Audio-Link
On
On
On
On⁶
Limited⁷
Off
Off
PLL
On
On
On
Off⁸
Off⁹
Off
Off
Table 8. Power Management
1. No DAC or ADC streams are active. Analog mixing and loop thru are supported.
2. D4 and D5 power states are entered only when D3cold is requested. D4 and D5 may be viewed as D3cold
behavioral options.
3. VAG is kept active when ports are disabled or in D3/D3cold/D4. PC_Beep is supported in D3 but may be
attenuated and distorted depending on load impedance.
4. VAG is always ramped up and down gradually, except in the case of a sudden power removal. VAG is active in
D2/D3 but in a low power state.
5. Both AVDD and DVDD must be available for Port Sense to operate.
6. Not active if BITCLK is not running (Controller in D3), but can signal power state change request (PME)
7. Only double function group reset verbs and link reset supported per ECR15b
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92HD66B