92HD71B8 데이터 시트보기 (PDF) - Integrated Device Technology
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92HD71B8 Datasheet PDF : 216 Pages
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92HD71B7
4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER
PC AUDIO
The default power state for the Audio Function Group after reset is D3-default..
Table 5. Power Managemen
D0
D1
D21
D3
vendor specific
Function
On
Off
Off
Off
-
DAC
On
Off
Off
Off
-
On
Off
Off
Off
-
D2S
ADC
On
Off
Off
Off
-
ADC Volume Control
On
Off
Off
Off
-
Ref ADC
On
Off
Off
Off
-
Analog Clocks
On
On
Off
Off
-
VrefOut Pins
On
On
Off
Off
-
Input Boost
On
On
Off
Off
-
Analog mixer
On
On
Off
Off
-
On
On
On
Low Drive2 Programmable
Mixer Volumes
Lo Amp
On
On
On
Low Drive2 Programmable
HP Amps
On
On
On
Low Drive3 Programmable
VAG amp
On
On
On
On4
Programmable
Port Sense
On
On
On
On
Programmable5
Reference Bias generator
On
On
On
On
Programmable5
Reference Bandgap core
On
On
On
On6
-
AZ-Link
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 D2/D3. Ports A, D, F and mono may be powered down using vendor specific
verbs.
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. BITCLK must be active and both AVDD and DVDD must be available for Port Sense to operate.
5.Vendor specific bit for Ref Top controls VAG generator, Bandgap Reference, and Reference bias generator. Place part into
D3 and power down all ports (using vendor specific verbs) before powering down Ref Top.
6.Obviously not active if BITCLK is not running (Controller in D3).
1.4.11.
Multi-channel capture
The capability to assign multiple “ADC Converters” to the same stream is supported to meet the
microphone array requirements of Vista and future operating systems. Single converter streams are
still supported and is done by assigning unique non zero Stream IDs to each converter. All capture
devices (ADCs 0 and 1) must be used to create a multi-channel input stream. There are no restric-
tions regarding digital microphones.
The ADC Converters can be associated with a single stream as long the sample rate and the bits per
sample are the same. The assignment of converter to channel is done using the “CnvtrID” widget
and is restricted to even values. The ADC converters will always put out a stereo sample and there-
fore require 2 channels per converter.
The stream will not be generated unless all entries for the targeted converters are set identically, and
the total number of assigned converter channels matches the value in the NmbrChan field. These
are listed the “Multi-Converter Stream Critical Entries.” table.
An example of a 4 Channel Steam with ADC0 supplying channels 0&1 and ADC1 supplying chan-
nels 2 & 3 is shown below. A 4 Channel stream can be created by assigning the same non-zero
IDT™ CONFIDENTIAL AND PROPRIETARY
16
4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER
92HD71B7
V 0.9 07/07
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