92HD005 Datasheet, PDF (22/205 Pages) Integrated Device Technology – 4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE

92HD005/92HD005D
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
PC AUDIO
1.3.9. Power Management
Table 5 describes the active functionality in each power state.
Table 5. Power Management
Function
D0-D1
D2
D3-default
D3-alternate
DAC
On
Off
Off
Off
ADC
On
Off
Off
Off
Ports
On
On
Off
Off
Headphone (HP) Amps
On
On
Off¹
Off
VrefOut
Port Sense
AZ-Link
VAG
On
On
On
On
On
On
On
On
Off
Off
On²
Programmable
On³
Programmable⁴
On⁵
Programmable
Differential Amplifiers
On
On
Off
Off
1. VAG is kept active when amplifiers are turned off.
2. If BITCLK is not active, a wake event must be generated. Otherwise an unsolicited response
is sent.
3. Not active if BITCLK is not running.
4. This mode can only be exited with a Bus Reset.
5. VAG is always ramped up and down gradually, except in the case of a sudden power
removal.
The D3-default state is available for HD Audio compliance. The programmable values exposed via
vendor-specific settings are under the IDT Device Driver control for further power reduction.
The default power state for the Audio Function Group after reset is D3-default.
1.3.10. Analog PC-Beep
PC Beep may need to be active on power up, in which case the BIOS is responsible for enabling it
by setting AnalogBeepEn in the AFG AnaCtrl widget. The PC_BEEP input is routed directly to the
MONO_OUT, LINE_OUT and HP_OUT pins of the CODEC. Because the PC_BEEP input drive is
often a full scale digital signal, some resistive attenuation of the PC_BEEP input is recommended to
keep the beep tone within reasonable volume levels. The user should mute this input before using
any other mixer input because the PC Beep input can contribute noise to the lineout during normal
operation.
Analog PC-Beep is not supported during Link Reset.
1.3.11. Headphone Drivers
Performance degradation will occur when using two headphones simultaneously. See the electrical
specifications for details.
IDT™
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4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
92HD005/92HD005D
V 1.0 12/06