Back-drill layers cause shorts in the Netlist Analyzer between different nets in Valor NPI.

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    Back-drilling is becoming a big topic in the near future with differential pairs and reducing stubs. This TechNote talks about Valor NPI and how it handles back-drill with the Netlist Analyzer.

     

    It could be very helpful information in the future:

    http://supportnet.mentor.com/?do=reference.technote&id=MG589981&prod=C129-S228-G311-P11671&lang=en&snw_source=pro&referringNode=portal