92HD99B Datasheet, PDF (15/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
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. The codec will shut down the capless headphone amplifiers and BTL amplifier in
D3 and below. In D3, Hendrix/Kaveri will turn on the BTL and Capless amplifiers if activity is detected on the PC_BEEP
input and analog PC_Beep is enabled.
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)
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.
2.5. 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.
2.6. 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.
2.7. 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
quick resume to either the D1 or D0 state. The part will resume from the D2 state to the D0 state
within 2mS.
2.8. AFG D3
The D3-default state is available for HD Audio compliance. All converters are shut down. Port ampli-
fiers and references are active but in a low power state to prevent pops. Resume times may be lon-
ger than those from D2, but still less than 10mS to meet Intel low power goals. The default power
state for the Audio Function Group after power is applied is D3.
While in AFG D3, the HD Audio controller may be in a D0 state (HD Audio bus active) or in a D3
state (HD Audio bus held in reset with no Bit_Clk, SData_Out, or Sync activity.) The expected behav-
ior is as follows (see the HDA015-B section for more information):
Function
HDA Bus active
Port Presence Detect state change Unsolicited Response
GPIO state change
Unsolicited Response
HDA Bus stopped
Wake Event followed by an unsolicited response
Wake Event followed by an unsolicited response
2.8.1.
AFG D3cold
The D3cold power state is the lowest power state available that does not use vendor specific verbs.
While in D3cold, the CODEC will still respond to bus requests to revert to a higher power state (dou-
IDT CONFIDENTIAL
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92HD99