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What is the warning Spectre CMI-2178?

VijayNXP

1.

In my AMS run using ADE amsstate in Xcelium I get the above warning. 

The warning is saying that GND connection (which is the top level terminal) cannot be connected to the a node inside the hierarchy. 

I tried searching for the warning message but found no documentation around it.

2. 

How do we find information about Spectre warning. The reference document of Spectre seems to mention nothing about it. 

3.

Also is there a command line access to spectre to query about warnings/error messages? 

Parents

  • Thank you Andrew! So from future reference perspective, where to find more information for a warning?

    Also, how to access the database from a command line to investigate it further. Because through schematic (eye-balling) is really tough and almost inefficient!! 

  • in reply to VijayNXP

    In general, the hope is that the message in the warning is enough to describe the problem; the code helps us (as application engineers) locate and narrow down a problem or see if something has been reported before.

    The key here (as I mentioned) would be for you to share the entire simulation log file - there's almost certainly important information in the text of what is reported beyond just the warning code. 

    Or you should contact customer support.

    Andrew.

Reply
  • in reply to VijayNXP

    In general, the hope is that the message in the warning is enough to describe the problem; the code helps us (as application engineers) locate and narrow down a problem or see if something has been reported before.

    The key here (as I mentioned) would be for you to share the entire simulation log file - there's almost certainly important information in the text of what is reported beyond just the warning code. 

    Or you should contact customer support.

    Andrew.

Children
  • in reply to Andrew Beckett

    Yes Andrew! I had a chat with customer support and could resolve the issue. It was indeed the case what you mentioned that after flattening of the netlist, the GND (global ground) had a short to an internal pin. I will try to reproduce the case with above warning and add the log here. I also mentioned in the ticket that documentation for warnings and with examples in those could be a great document. The support contact has taken a note to reach out to R&D. 

    So to summarize the warning indicated: a connection of global ground (GND) to an internal pin. The way it happened is as follows:

    The internal pin was an (discipline login) output (Driving the logic blocks further) and was internally connected to ground with zero resistance. The intent of the designer was to put this output to zero (logic zero) and to do that he connected it straight to GND with zero resistance in between. 

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