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"Assertion Failed" in Noise-Aware PLL Simulation

Cod Liang

Dear all,

I’ve followed the tutorial of Noise-Aware PLL Design Flow released by Cadence and try to get the phase noise of my PLL.

The VCO+DIVIDER macro model extraction went well with no error. (please see http://imgur.com/WabXwrT)

However, when I moved to PFD+CP extraction, “assertion failed” popped out and the simulation was ceased. (please see http://imgur.com/6DjFyLS, http://imgur.com/Hr9TP7N, http://imgur.com/uRqrS50)

I was almost sure that the instance name and cell name of the port in these testbenches were correct, and PSS/Pnoise setup seemed to be nothing different from that shown in the tutorial.

Could anyone please help me figure out the problem?

 

Simulation environment:

Virtuoso version IC6.1.5-64b.500.15

Spectre version 10.1.1 32bit

MMSIM version 10.11.412

 

If the information I provided is not sufficient enough to clarify the problem, please tell me.

Thanks a lot. :)

 

Liang

Parents
  • Andrew Beckett

    Liang,

    This was end-of-lifed many years ago and no longer is available (the documentation was finally removed in MMSIM12.1, and the menus were removed in ADE in IC616 ISR2, so shortly after the version you're using).

    An assertion failure is an internal error in the simulator. Without seeing the netlist and models (it is suggesting you send this to customer support; this site isn't customer support...), your only real option is to try a later version, but your options are going to be limited given the fact that the flow is end-of-lifed... plus the fact that since these are old versions, there's not much choice available on

    I see that there is still MMSIM10.1 available (for some strange reason which might change soon), but after that there's only MMSIM14.1 and MMSIM15.1 which don't have the noise aware flow. The MMSIM10.1 on downloads has a later hotfix available than the one you're using, but you might get lucky...

    So to summarise, the flow you're trying to use is unsupported now. The problem you have might be nothing to do with the noise aware flow, but the issue is that finding a fixed version of the simulator (rather than a 5-6 year old version that you're using) which also provides the noise aware flow might be tricky.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Liang,

    This was end-of-lifed many years ago and no longer is available (the documentation was finally removed in MMSIM12.1, and the menus were removed in ADE in IC616 ISR2, so shortly after the version you're using).

    An assertion failure is an internal error in the simulator. Without seeing the netlist and models (it is suggesting you send this to customer support; this site isn't customer support...), your only real option is to try a later version, but your options are going to be limited given the fact that the flow is end-of-lifed... plus the fact that since these are old versions, there's not much choice available on

    I see that there is still MMSIM10.1 available (for some strange reason which might change soon), but after that there's only MMSIM14.1 and MMSIM15.1 which don't have the noise aware flow. The MMSIM10.1 on downloads has a later hotfix available than the one you're using, but you might get lucky...

    So to summarise, the flow you're trying to use is unsupported now. The problem you have might be nothing to do with the noise aware flow, but the issue is that finding a fixed version of the simulator (rather than a 5-6 year old version that you're using) which also provides the noise aware flow might be tricky.

    Regards,

    Andrew.

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