Intel 815 Manual do Utilizador descarregar pdf (Página 119)

I/O Subsystem

Intel

815 Chipset Platform Design Guide 119

10.3 AC’97

The ICH implements an AC’97 2.1-compliant digital controller. Any codec attached to the ICH

AC-link must be AC’97 2.1 compliant as well. Contact your codec IHV for information on 2.1-

compliant products. The AC’97 2.1 specification is available on the Intel website:

http://developer.intel.com/pc-supp/platform/ac97/index.htm

The ICH supports the codec combinations listed in Table 27.

Table 27. AC’97 Configuration Combinations

Primary Secondary

Audio (AC) None

Modem (MC) None

Audio (AC) Modem (MC)

Audio/Modem (AMC) None

As shown in Table 27, the ICH does not support two codecs of the same type on the link. For

example, if an AMC is on the link, it must be the only codec. If an AC is on the link, another AC

may not be present.

10.3.1 AC’97 Routing

To ensure the maximum performance of the codec, proper component placement and routing

techniques are required. These techniques include properly isolating the codec, associated audio

circuitry, analog power supplies, and analog ground planes, from the rest of the motherboard. This

includes plane splits and proper routing of signals not associated with the audio section. Contact

your vendor for device-specific recommendations.

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Intel 815 Manual do Utilizador Página 119