Pci Trace Routing Guidelines; Table 34 Pci Trace Routing Guidelines - Emerson COM Express Carrier Design Manual

 Route all traces over continuous planes with no interruptions (ground reference preferred). Avoid
crossing over anti-etch, if at all possible. Crossing over anti-etch (split planes) increases inductance
and radiation levels by forcing a greater loop area.
 Route digital power and signal traces over the digital ground plane.
 Position the bypassing and decoupling capacitors close to the IC pins with wide traces to reduce
impedance.

21.4.1 PCI Trace Routing Guidelines

Table 34 PCI Trace Routing Guidelines

Suggested trace parameters are shown. Using impedance calculation software is recommended
to determine trace width, distance to reference planes, and pair spacing applicable to your
specific project and PCB materials.
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Design Guide