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Allegro v16 dynamic shape clearance overrides (50 ohms and 90 ohms, 3W rule) Class to class?

Robert Finley

All of our designs have RF microstrip, 50 ohms, with a trace width of 0.35mm but digital routing has to be 0.12mm.  

In lesser environments, you set copper clearance override on the RF net class to the trace width or whatever and that adds extra clearance to everything else.

I am relying on DYN_CLEARANCE_OVERRIDE, which works if i manually check ground stitching vias so they don't stick out.

V16 pre-dates the padstack change in V17.2 and Mentor probably won't ever fix their importer.

Anyone remember how to  do this  pre-17.2?

Thanks!

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  • 0

    It's working now. 

    Need to stop implementing clearance rules the same way required by inferior workflows.

    Cadence enables us to set up physical ruleset(s) by requirement (uncontrolled/power clines, 90 ohm, 50 ohm, diff pairs) and clearance ruleset(s).

    This is what needs to be referenced by one or many net groups.

    Things were broken across all versions I have installed currently, which tells me I'm doing it wrong.

    Until I figure out how to delete a post, thanks!

Reply
  • 0

    It's working now. 

    Need to stop implementing clearance rules the same way required by inferior workflows.

    Cadence enables us to set up physical ruleset(s) by requirement (uncontrolled/power clines, 90 ohm, 50 ohm, diff pairs) and clearance ruleset(s).

    This is what needs to be referenced by one or many net groups.

    Things were broken across all versions I have installed currently, which tells me I'm doing it wrong.

    Until I figure out how to delete a post, thanks!

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