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Schematics cannot be mapped simulators

samer1

Greetings,

I am using cadence 6.1.6. I automatically generate the netlist through a python code and run it from a skill script. I initially designed the circuit using the schematic editor and created the netlist from the ADE so that all the necessary files are generated. Then, I used my python code to re-write the netlist in the netlist file .../spectre/schematic/netlist/netlist. The reason for that is I am simulating a circuit of a big size that will be hard to draw. The problem now is when I try to read the current through some of the resistors (ex, R5/MUNUS) it generates the following warning:

WARNING (ADE-3022): Schematics of the following net names could not be mapped to
simulators. Ensure that the specified schematic names are valid.
/R5/MINUS

and it gives me the value as "nil". I noticed that all resistors that were NOT IN THE ORIGINAL SCHEMATIC I DREW MANUALLY give nil. The only currents that I can compute are the ones that were in the original schematic. I guess the problem is with one of the files generated automatically when I first created the schematic. 

Is there a solution to that?

thanks

sherif 

  • Hi Sherif,

    Assuming you are trying to access the current using the OCEAN function i("/R5/MINUS" ?result 'tran) or similar (e.g. the IT() function), then the problem is that you're using a "schematic name" rather than a "netlist name". If you use a name that begins with a "/" it's assumed to be in Virtuoso's name space and is mapped to whatever it was called in the netlist; however, to do this, it needs to know how that mapping was done - and that's only produced for things that were actually netlisted.

    If you use a name that doesn't begin with a / you can access the information - for example "R5:1" (the first terminal of the resistor). Note that for primitive resistors, spectre doesn't normally save both terminal currents unless you explicitly ask it - so you might need to just use R5:1 and negate the result.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Got it. thanks Andrew. that fixed it

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