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MMSIM 6.2 - Spectre question

yoyega

Hi,
I am using MMSIM 6.2 to run some Spectre simulations and I am having some unexpected problems with the results. I am simulating files netlistTRAN022.1x1.saveall.PHC.scs and  netlistTRAN022.1x1.saveselected.PHC.scs. The only difference between these files is the following options statement:

(in netlistTRAN022.1x1.saveall.PHC.scs)
saveOptions options save=all pwr=all currents=all useprobes=yes

(in netlistTRAN022.1x1.saveselected.PHC.scs)
saveOptions options save=selected currents=selected useprobes=yes

but simulation results for the saved signals are completely different depending on the scs file I run. As far as I understand, the above options statements should not change the results of a simulation, only the signals to be saved to HHDD, am I right?

Do you know which could be the problem?

 Thanks,

Pedro

Parents

  • Thank you very much Andrew, it looks like the problem was the useprobes option (I inhereted the script from another designer and, although I didn't need it,  I thought that the useprobes option was harmless for my simulations...looks like I was wrong...again...:) ).

     

    By the way, I have another problem. The circuit I am simulating is quite big, and if I use the save=all or save=allpub a file of 50GB is generated as the output of a tran analysis. If I select just a few signals of interest to be saved and use save=selected option the file is much smaller, but still measured in GB (about 7 - 8). The problem is that when I try to view the results with wavescan or ocean, sometimes, the application can not handle such big files. Do you know a way to overcame this problem?...maybe there is a way to separate the saved signals in several files instead of just only one...

     Thanks,

    Pedro

Reply

  • Thank you very much Andrew, it looks like the problem was the useprobes option (I inhereted the script from another designer and, although I didn't need it,  I thought that the useprobes option was harmless for my simulations...looks like I was wrong...again...:) ).

     

    By the way, I have another problem. The circuit I am simulating is quite big, and if I use the save=all or save=allpub a file of 50GB is generated as the output of a tran analysis. If I select just a few signals of interest to be saved and use save=selected option the file is much smaller, but still measured in GB (about 7 - 8). The problem is that when I try to view the results with wavescan or ocean, sometimes, the application can not handle such big files. Do you know a way to overcame this problem?...maybe there is a way to separate the saved signals in several files instead of just only one...

     Thanks,

    Pedro

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