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Spectre X Transient Simulation Discrepancy vs. Spectre APS

jacob.sillman over 1 year ago

Hi,

Here is some info about my current install:

Spectre Version: 21.1.0.isr20 64 bit

Virtuoso Version: ICADVM20.1-64b.500.25

I currently use the Spectre APS simulator for doing top-level analog verification. The part has a mix of full-analog and systemverilog instances. I use ADE Assembler with the ams simulator to run my testbenches. After discovering Spectre X, I decided to give it a try on a few testbenches. I enabled Spectre X in the High Performance Simulation settings, and tried it on a multitude of different accuracy presets. I looked at the Netlist and Run Options window and saw that "Enable AMS flexible release matrix" is checked by default.

In every test I performed, the part would act completely erroneously when compared to the results from the Spectre APS simulator. The part would not even startup, and the operating point of several nets were completely off. In Vx and Lx, the simulation would run quickly but not reach any correct operating point. In Mx and below, the timestep would become so small that no progress was made past a few hundred us and eventually it would fail to converge. I'm not sure what troubleshooting steps I should take to try to resolve these issues, and what (if any) changes should be made when performing AMS simulations using Spectre X. Any advice is appreciated.

-Jacob

Andrew Beckett over 1 year ago

Jacob,

That's odd, and I wouldn't expect that. The best thing to do here is to contact customer support (submit a support case after logging in). Then one of the team can look at this in detail with you.

Regards,

Andrew
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JankoK over 1 year ago

Hi Jacob,

It is probably best to file a ticket and share a testcase with your local AE... this could be something very specific that requires some detailed debugging. Double check if your Spectre-Xcelium versions are compatible, as explained here. You can also double check your Spectre X setup, How to use Spectre X from Virtuoso ADE Explorer or Assembler and for mixed-signal simulations.

BR

/Janko
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jacob.sillman over 1 year ago in reply to JankoK

Hi JankoK, thank you for your input. I will look at the article you sent and also try to setup a meeting with an AE.
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jacob.sillman over 1 year ago in reply to Andrew Beckett

Hi Andrew, thanks for the response. I'll look into setting up a support ticket. I will update the thread if the issue ends up being a general issue.
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