IDT CONFIDENTIAL
20
V 0.987 11/09
2009 INTEGRATED DEVICE TECHNOLOGY, INC.
92HD81
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
The D3-default state is available for HD Audio compliance. The programmable values, exposed via
vendor-specific settings, are under IDT Device Driver control for further power reduction. The analog
mixer, line and headphone amps, port presence detect, and internal references may be disabled
using vendor specific verbs. Use of these vendor specific verbs will cause pops.
The default power state for the Audio Function Group after reset is D3.
2.6.
AFG D0
The AFG D0 state is the active state for the device. All functions are active if their power state (if they
support power management at their node level) has been set to D0.
2.7.
AFG D1
D1 is a lower power mode where all converter widgets are disabled. Analog mixer and port functions
are active. The part will resume from theD1 to theD0 state within 1 mS.
2.8.
AFG D2
The D2 state further reduces power by disabling the mixer and port functions. The port amplifiers
and internal references remain active to keep port coupling caps charged and the system ready for a
ADC Volume Control
On
Off
Ref ADC
On
Off
Analog Clocks
On
Off
GPIO pins
On
On
Off
VrefOut Pins
On
Off
Input Boost
On
Off
Analog mixer
On
Off
Mixer Volumes
On
Off
Analog PC_Beep
On
Off
Digital PC_Beep
On
Off
Lo/HP Amps
On
Low Drive2 Low Drive2 Low Drive2 Off
Capless HP Amps
On
Low Drive
2 Low Driv
e2 Low Drive
2Off
BTL Amp
On
Off
VAG amp
OnOnOn
Low Drive3 Low Drive
Low Drive
Off
Port Sense
On
On4
Off
Reference Bias generator
On
Off
Reference Bandgap core
On
Off
HD Audio-Link
On
On5
Limited
Off
1.
No DAC or ADC streams are active. Analog mixing and loop thru are supported.
2.
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.
3.
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.
4.
Both AVDD and DVDD must be available for Port Sense to operate.
5.
Not active if BITCLK is not running (Controller in D3), but can signal power state change request (PME)
Function
D0
D11
D2
D3
D3cold
Vendor
Specific D4
Vendor
SpecificD5
Table 5. Power Management