Hi Amit,
The signal propagation will be impacted by trace coupling (mutual
inductance / capacitance) and driving pattern(even or odd mode). You may
need to consider both for skew control.
Thanks,
John Lin
2015-05-12 22:39 GMT+08:00 Amit Kumar <amit.j.kumar@xxxxxxxxxxxxx>:
Hello guys,
I am making a board using a FPGA whose serdes runs on 12.5 Gbps.
Owing to the FPGA ball map, the diff pair routing on the PCB has about 1mm
of intra pair skew.
1 mm of skew translates to about 7-8 ps of electrical skew which I suppose
can't be ignored.
Now if I do length matching, we will have uncoupled zigzag routing(of
~1mm) on one of the signal. Question is : Is it ok to do length matching in
such cases?
Regards
Amit
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