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About noise-aware PLL design flow

sriram123

I started the noise aware PLL design flow using cadence 5.141ISR and MMSIM7.1 spectre. When I run PSS on my PFD/CP bench, it gives me an error saying

FATAL(CMI-2010): Assertion failed in file 'check.c' at line 499.

FATAL(SPECTRE-21):Assertion failed.

Please help me identify the problem.

 

Thanks

Sriram Muralidharan

  • Hi Sriram,

    On possible reason (although I saw this on older versions...not 7.1):

    Check your vsource statements.  Do they all have a dc value set?  

    If they do not, you will see this error.

    If you put a dc value on the vsource, the error will go away.

     I recommend upgrading to MMSIM 7.2 (latest ISR), as this issue may go away with a newer version of spectre.  Otherwise, please contact Cadence Customer Support.

    best regards,

    Tawna

  • Hi Tawna,

    I have the same problems like Sriram. I tried to set up a PFD/CP simulation with the 'Noise Aware PLL Flow'. I inserted my own PFD/CP circuit into the testbench and set up a PSS and PNOISE simulation. For the oscillation sources I just set up a rectangular signal with a frequency of 25 MHz.

    I dont know where the error comes from. Can you or someone else help me?

    Thanx in advance

    Markus

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