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Cadence spectre save options are confusing

jasongong

Hi All,

I found that the save options in ADE-> save all are very confusing.

there is no clear documentation on difference between nestlvl and subcktprobelvl.

i got an impression that nestlvl is for voltage probes, and subcktproblvl is for terminal currents.

consider following requirement: 

i try to save selected voltage signals and top to "top-2" level terminal currents.

if i choose "select signal to output(save)" to be "selected",  the subcktprobelvl = 2, select device current (currents) = all,

then simulation output selected voltage (which is correct) but output the terminal current from very bottom transistor to terminal

current which are 2-3 levels up.

if i choose  "select signal to output(save)" to be "lvlpub",  the nestlvl = 2,  the subcktprobelvl = 2, select device current (currents) = all,

then simulation output selected voltage and the terminal currents from top level down 2 level currents.

so it seems that nestlvl do affect the terminal current output but it is never specified in ADE or spectre manual in detail.

i am hoping that expert here can give a explanation on how different save options affect the voltage and current output.

thanks

jason

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  • Andrew Beckett

    Jason,

    My limited checks seemed to show it was working OK. If you're seeing what you perceive as incorrect behaviour, you should contact customer support with a testcase that illustrates the problem, then we can work on getting it fixed (or we can clarify if it is indeed correct behaviour).

    Regards,

    Andrew.

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  • Andrew Beckett

    Jason,

    My limited checks seemed to show it was working OK. If you're seeing what you perceive as incorrect behaviour, you should contact customer support with a testcase that illustrates the problem, then we can work on getting it fixed (or we can clarify if it is indeed correct behaviour).

    Regards,

    Andrew.

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