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Procedural interface for Virtuoso schematic navigator

PSOORYA

I am trying to get the hierarchical list of instances that a net is connected to. I found two flows and both have issues:

 

  1. Schematic Navigator --> Select Net --> Right-Mouse-click on the net in navigator --> Probe --> Add net and connected instance
    • This works great and it probes all the instances the net is connected to.
    • However the geGetAllProbe() returns the probeId of the net. I can't get the dbId of instances connected to the net procedurally. Is there a better way to get these instance dbIds?
  2. auProbeAddDevsForNet()
    • This auLvs() functionality is broken. Works on certain schematics but fails on many.
    • I also tried setting the graphic env variable probeNetDisplayCheckInstance and this did not work
    • windowId~>probeNetDisplayCheckInstance = t did not work either
    • Is this function supported at all?

 

I heard probing has been enhanced in IC616 and I am yet to try this.

Any help or insight into this is greatly appreicated.

-- PSoorya 

  • Andrew Beckett

     Probe objects do not provide such information.

    The auProbeAddDevsForNet() is not really "broken", but was never intended for certain operations. For example, it was never intended to be used down in the hierarchy. It only looks down, and not up. You can use the Right Mouse->Probe->Net and connected instances in the navigator to do this properly. But that won't help you because it's a probe too.

    You should look at the probes assistant in IC616, since this provides lots of information about everything connected to the probe. You can export this to a CSV file. That said, it doesn't provide a SKILL API to do this - if you want that, please contact customer support.

    The alternative is to write your own code to trace through the hierarchy and find all connected nets. This is not entirely trivial, particularly if you need to cope with iterated instances, busses, inherited connections, and connections that go up and down the hierarchy. Not impossible, but a reasonable amount of work to write and get right.

    Regards,

    Andrew.

  • PSOORYA

    Thanks Andrew.

    I now have a simple recursive SKILL procedure that traces the nets and dumps the hierarchical instance lists. This works on most schematics but I will have to run more checks. We have a custom check&Save and don't use inherited connections.

    FYI --> I tried auProbeAddDevsForNet() since this was mentioned in Cadence sourceLink solution #11263856 for hierarchy traversal -- exactly identical to what I wanted to do. And this implementation does not work on all schematics. There was no error or warnings in the CIW. The documentation for this function is very brief. If this function is not meant for hierarchy traversal, it would be best if this solution is revised or removed from the support.cadence.com site.

    Thanks again. I will try the probes assistant in IC616 as well. I think the CSV would suffice for what I want to do.

    -- PSoorya 

     

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