STAC9752A datasheet(28/106 Pages) IDT

28 / 106 page

STAC9752A/9753A

AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

PC AUDIO

IDT™

STAC9752A/9753A

V 1.5 1206

AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

The following are potential 24.576MHz clock options available to a Secondary CODEC:

•

Using an external 24.576 MHz signal source (external oscillator or AC‘97 Digital Controller)

•

Using the Primary’s crystal out

•

Using the Primary’s BIT_CLK output to derive 24.576MHz

See section 2.2.4: page17 for clock frequencies supported and configurations.

4.5.

STAC9752A/9753A as a Primary CODEC

Primary devices are required to support correctly either of the following clocking options:

•

24.576MHz crystal attached to XTAL_IN and XTAL_OUT

•

24.576MHz external oscillator provided to XTAL_IN

•

12.288MHz oscillator provided to the BIT_CLK input

The Primary device may also optionally support the following clocking option:

•

14.318MHz external oscillator provided to XTAL_IN

See section 2.2.4: page17 for clock frequencies supported and configurations.

4.5.1.

STAC9752A/9753A as a Secondary CODEC

Secondary devices are required to function correctly using one or more of the following clocking

options:

•

24.576MHz external oscillator provided to XTAL_IN (synchronous and in phase with Primary

24.576MHz clock)

•

BIT_CLK input provided by the Primary. In this mode, a clock at XTAL_IN (Pin 2) is ignored.

See section 2.2.4: page17 for clock frequencies supported and configurations.

4.6.

AC-Link Power Management

4.6.1.

Powering down the AC-Link

The AC-Link signals can be placed in a low power mode. When AC‘97’s Powerdown Register (26h)

is programmed to the appropriate value, both BIT_CLK and SDATA_IN are brought to and held at a

logic low voltage level. After signaling a reset to AC‘97, the AC‘97 Controller should not attempt to

play or capture audio data until it has sampled a CODEC Ready indication from AC‘97.

STAC9752A Datasheet(PDF) 28 Page - Integrated Device Technology

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