I'm using Mentor Graphics's DxDesigner to design a PCB. As a side note, I do know what design rule checks (DRCs) are, but I'm completely new to DxDesigner and am not sure what each of their DRCs are.

I currently have 335 errors.

  • 328 connectivity errors

    • drc-106 --> more than one driver on a net
    • drc-121 --> redundant hierarchical symbol on net
  • 7 migration errors

    • drc-001 --> Property ______ has invalid format
    • Note: the specified properties contain these characters: letters, numbers, dashes

If anyone knows how to fix these DRCs that would be great. Otherwise, a link to some good documentation would also be great.

  • 1
    \$\begingroup\$ DxD is a total piece of crap when I insisted our company stopped using it back in 2010. I'm sorry to see folk still using it. \$\endgroup\$
    – Andy aka
    Jun 29, 2017 at 22:37

1 Answer 1


As a first port of call I would try loading the help documentation in DxDesigner.? There is actually a surprising amount of information which has helpful search functionality.

In any case, hopefully the following will help:

  • DRC-106 is basically you have more than one pin of type "output" connected to a net (e.g. two logic gate outputs) which is usually indicative of either a bad connection, or incorrect pin type in one or other of the symbols.
  • DRC-121 indicates that you have a hierarchy symbol (e.g. "hier-in" or "hier-out", etc.) symbol attached to a net in your schematic, but you are not using it for anything. As such that symbol is redundant.

Not sure about DRC-001.

  • \$\begingroup\$ How do I get rid of the "more than one driver" error if all I'm doing is connecting pin1 to pin1 of two different ICs? \$\endgroup\$
    – J-Win
    Jun 29, 2017 at 21:22

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