进SigXplorer时出现警告: " k$ t# E5 G: {+ gNo reference plane is found for the trace to be extracted.4 H$ N9 x' e$ V! I. Q
The trace is being extracted as Microstripline just for topology viewing & q9 M; ?/ W$ b7 C( \$ W; c' T0 S( j, p
俺的是六层板,SGSSPS,) T# `+ v M9 a% A E4 m* n: H