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11.
It is recommended to add serial damping resistors to all high-speed signals,
especially the clock signals, to reduce high frequency energy and EMI. These
resistors should be placed as close to the driving source as possible.
12.
The clock signals should be the first routed trace in any PCB design. Adjacently
routed (guard) ground traces provide shielding and signal return path. These
ground shielding traces should be connect to the ground plane by vias at both
ends. It is best to run all clock signals on the signal plane above a solid ground
plane (on a multi-layer board).
13.
If clock/ high-speed signals must make a layer jump, route ground trace adja-
cent to the signals and connect both ends of the ground trace to the GND plane,
to form a RF return path of the signals.
14.
The split power planes may cause serious EMI and signal integrity problems for
high-speed signals which run adjacent to the power planes. To minimize these
problems, some decoupling capacitors should be placed between these split
power planes, to enhance RF return current path.
15.
Any unused area of the top and bottom signal layers of the PCB can be filled
with copper that is connected to the ground plane through stitches of vias.
16.
Example for BGA Power/ Ground routing:
EVA-X4300 System Design Guide
12
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