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21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller
24 Design Guide
• Engineering Electromagnetic Capability, by V. Prasad Kodali
6.2.2 Suggestions for Routing
For routing information, consider the following suggestions:
• Never route any etch (power or ground) across a partition or void because the signal loses its
return-path integrity and contaminates the isolated plane.
• Avoid placing oscillators, phase-locked loops, and other clock-type devices near I/O connectors.
• Route all critical signals (for example; clocks, video output) directly in the etch and avoid, if
possible, using vias (signal paths routed between planes in an etch board).
Note: Critical signals should be prioritized from the fastest to the slowest with respect to frequency and
rise time. The fastest critical signals should be routed first.