进SigXplorer时出现警告:& x: a2 L' p0 K, Q& z9 D5 H2 F2 G
No reference plane is found for the trace to be extracted. & ]- {& I( a9 _" A7 TThe trace is being extracted as Microstripline just for topology viewing$ s# G! e/ Q' i) F8 u/ G- S
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俺的是六层板,SGSSPS,. f5 _9 L. `. U7 Y* d4 U2 q; G* |