Tee Topology Ac'97 Trace Length Requirements; Daisy-Chain Topology Ac'97 Trace Length Requirements - Intel VC820 - Desktop Board Motherboard Design Manual

Layout/Routing Guidelines
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.
For increased part placement flexibility, there are two routing methods for the AC'97 interface: the
tee topology and the daisy-chain topology. The AC'97 interface can be routed using 5 mil traces
with 5 mil space between the traces.
Figure 2-52. Tee Topology AC'97 Trace Length Requirements
Figure 2-53. Daisy-Chain Topology AC'97 Trace Length Requirements
2-62
ICH
2" Max
ICH
5" Max
4" Max
A
M
3" Max
R
A
M
3" Max
R
Intel
Codec
Codec
®
820 Chipset Design Guide