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92HD73C

SIX CHANNEL HD AUDIO CODEC

Integrated Device Technology 

92HD73C

SIX CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT

PC AUDIO

the CODEC to become active, the driver will immediately transition the CODEC from D3 to D0. To

enable this use model, the CODEC must resume within 10mS and not pop.

The default power state for the Audio Function Group after reset is D3-default

1.4.9.5. AFG D3 and vendor specific verbs

The programmable values, exposed via vendor-specific settings, are under the IDT Device Driver

control for further power reduction.

1.4.10.

Low-voltage HDA Signaling

The 92HD73C is compatible with either 1.5V or 3.3V HDA bus signaling; the voltage selection is

done dynamically based on the input voltage of DVDD_IO.

When in 1.5V mode, the 92HD73C can correctly decode BITCLK, SYNC, RESET# and SDO as they

operate at 1.5V; additionally it will drive SDI and SDO at 1.5V. None of the GPIOs are affected, as

they always function at their nominal voltage (DVDD or AVDD).

1.4.11.

Multi-channel capture

The capability to assign multiple ADC “Input 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 cap-

ture devices (ADCs 0 and 1) may be used to create a multi-channel input stream. There are no

restrictions regarding digital microphones. However, the SPDIF input can not be used with an ADC

to create a 4-channel stream. SPDIF_In only supports stereo capture.

The ADC Converters can be associated with a single stream as long as 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

stream id “Strm= N” to both ADC0 and ADC1. The sample rates must be set the same and the num-

ber of channels must be set to 4 channels “NmbrChan = 0011”.

ADC1 CnvtrID

ADC0 CnvtrID

(NID = 0x08)

[3:0]

(NID = 0x07)

[3:0]

Table 8: Example channel mapping

Ch = 2

Ch = 0

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SIX CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT

92HD73C

V 1.3 08/11

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