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PLL simulation error

Firas Abdel Ghani

Hello, 
I'm doing a transistor level PLL simulation for the first time and i'm getting this error:

and this is the PLL circuit: 

from similar posts and answers here I got that one reason might be is saving a lot of signals, but I didn't save more than 5-6. and I didn't also save currents.

the simulation is 4[us] long.

While wondering what might be the reason for that error, could mixing RF transistors (egnfet_rf) and non-RF transistors (nfet) in different blocks in the system might cause a problem?

one thing left is checking with my University adviser if we're not talking about Disk Storage issues. but I don't think this is the case because I emptied a lot of space. 

since the last post I've seen about the subject was 2 years ago, does the solution for this problem is more clear now? 
I'd be glad for suggestions how to solve the problem.

Thanks,

Firas

Parents Reply Children
  • in reply to Firas Abdel Ghani

    Sorry, I misread the error - I thought it was SST2 related but you're already using PSF XL. There were some issues related to spectre (you didn't provide the spectre version, which I asked for). I saw one CCR (1871172) which was fixed in SPECTRE16.1 ISR14 and SPECTRE17.1 ISR4.

    There was a change related to a new compressed PSF XL format. 

    The issue would have been data dependent, and so the fact that it worked with the sub-blocks doesn't really tell you anything. It's likely to be related to the size of the file - with a PLL you might have some very large waveforms (lots of points) so that might be what is triggering the problem.

    So if it's this issue (and knowing the spectre version would help) the right solution would be to use a newer SPECTRE version than the ones above.

    A workaround (not ideal) is to change the output format on Outputs->Save All (e.g. to sst2 or psfbin). These are less performant though so that's why it's not ideal.

    This is all assuming that it's the same error and not just that you've exceeded your disk quota (it might be that the disk isn't full, but your quota is).

    Andrew.

  • in reply to Andrew Beckett

    I'm not sure where to find this log file. (there are many files inside the folder of the simulation).

    but I guess the version could be here:
    /tools/kits/GF/28n/28SLP_RF/pdk-28SLP_V1.1_3.0/MODEL/RF/Spectre/models/design_include.scs

    does V.1_3.0.0 tell you anything? 

    Also, thanks for the suggested solution, unfortunately it didn't run anything and I got a white screen when I did the simulation. 

    one of the errors that I saw is: " Data Disk image is malformed ".

  • in reply to Firas Abdel Ghani

    The very first screenshot you posted was of the spectre output log file. The version number is at the top of that log file.

    The version number above is the version of your PDK - that's not relevant here.

    Andrew.

  • in reply to Firas Abdel Ghani

    Hi Firas,

    OK, so that's before the fix. Assuming it's the same issue, you would need to either move to a later version of the simulator, or change the output format on Outputs->Save All as I mentioned earlier (updating the version would be preferable).

    Regards,

    Andrew.

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