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Layout and Routing Guidelines
4.9
AC'97
The ICH implements an AC'97 2.1 compliant digital controller. Any codec attached to the ICH
AC-link should be AC'97 2.1 compliant as well. Contact your preferred codec vendor for
information on AC'97 2.1 compliant products. The AC'97 2.1 specification is on the Intel website:
The ICH supports the following combinations of codecs:
Table 4-6. AC'97 Configuration Combinations
Audio/Modem (AMC)
As shown in
example, if an AMC is on the link, it must be the only codec. If an AC is on the link, another AC
cannot be present.
4.9.1
Audio/Modem Riser Card (AMR)
Intel is developing a common connector specification known as the Audio/Modem Riser (AMR).
This specification defines a mechanism for allowing OEM plug-in card options. The AMR
specification is available on the Intel developer website:
The AMR specification provides a mechanism for AC'97 codecs to be on a riser card. This is
important for modem codecs as it helps ease international certification of the modem.
4-18
http://developer.intel.com/pc-supp/platform/ac97/index.htm
Primary
Audio (AC)
Modem (MC)
Audio (AC)
Table
4-6, the ICH does not support two codecs of the same type on the link. For
http://developer.intel.com/pc-supp/platform/ac97/index.htm
Secondary
None
None
Modem (MC)
None
®
Intel
810A3 Chipset Design Guide
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