Intel VC820 Design Guide - Page 87
AC’97, example, if an AMC is on the link, it must be the only codec. If an AC is on the link
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Layout/Routing Guidelines Figure 2-51. Resistor Requirements for Secondary IDE Connector PCIRST_BUF#* SDD[15:8] SDD[7] SDD[6:0] SDA[2:0] SDCS1# SDCS3# SDIOR# SDIOW# SDDREQ 5V 5V 1k ohm SIORDY IRQ15 SDDACK# 8.2k-10k 5.6k ohm ohm ICH 22 - 47 ohm Reset# Secondary IDE Connector 10k ohm 470 ohm N.C. N.C. CSEL Pin 32 Pin 34 *Due to ringing, PCIRST# must be buffered. 2.14 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 on the Intel website. The ICH supports the following combinations of codecs: Table 2-15. ICH Codec Options Primary Audio (AC) Modem (MC) Audio (AC) Audio/Modem (AMC) Secondary None None Modem (MC) None As shown in the table, 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 cannot be present. Intel has developed a common connector specification known as the Audio/Modem Riser (AMR). This specification defines a mechanism for allowing OEM plug-in card options. Intel®820 Chipset Design Guide 2-61