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Adding outputs to Maestro cellview - outputs added with axlAddOutputExpr not working properly

CM202407311241

I am having trouble adding output expressions to maestro using axlAddOutputExpr. The expression gets added to the output list, however the added lines are purple(less of a concern to me, but not sure exactly why this happens) and they do not generate plots when simulating with spectre. However, when I add the same expression in manually through the calculator, the new output added via calculator works along with the previous output added via axlAddOutputExpr. In the CIW I am getting "ERROR (EXPLORER-2708): Evaluation of output failed for point: '1' ". This also goes away for outputs after adding the same expression via calculator.

I have also found that adding a corner to the simulation allows all the output expressions to plot, even the ones that did not have copies added manually via calculator. However another line gets added to the results which cannot be evaluated as it is not valid (in this case I'm trying to plot the current through a node on a diode using IT("/D49/nw"), but another line gets added to the results with /D49/nw listed as the output). In the results tab of maestro, the outputs which cannot be evaluated show the plot icon under both corners (plots are empty when opened), while the ones originally added using axlAddOutputExpr only show the plot icon under nominal yet the plots have both corners when opened.

The SKILL command I am using is:

axlAddOutputExpr(session testName diodeName ?expr expr ?plot t ?save t)

I have printed the session, testName, diodeName, and expr variables (defined earlier in the procedure) which all seem to be valid. It appears as if they get added to the outputs as intended and I get no errors when initially using this command, only issues when I run the simulation. Should I be using a different SKILL command to avoid this or could this be a bug? Any help with this strange behavior would be appreciated!

  • Hi,

    I've done something similar only once and I am not sure whether you need the same thing, but I was able to save signals to the ADE output using the maeAddOutput API:

    I hope that somehow this helps.

    Regards,

    Petar

  • in reply to p94todorov

    Thanks for the response Petar. Unfortunately I seem to be running into the same problems with maeAddOutput.

    However, it seems that the issues of outputs being highlighted purple and the plot icon not showing under all corners have both been fixed as I am no longer experiencing either of those issues with axlAddOutputExpr or maeAddOutput.

  • in reply to CM202407311241

    I don't know how this happened, but it seems that the outputs were added with an "eval type" of something other than "points" (could be sweeps, corners or all). The eval type column isn't normally shown in Explorer (you can use right mouse over the column headings to add it) but does show in Explorer).

    axlAddOutputExpr() has an ?evalType argument that allows you to set this; with maeAddOutput() the argument is ?outputType. If you don't specify it though, it should add as a "point" expression (and hence not be purple).

    I don't know how the outputs could have been purple (a non-points expression) without having explicitly set it.

    Andrew

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