Hello,
I'm simulating an old processor to test Spectre XPS. When I simulate with Spectre only or Spectre APS++ the results are fine, however, when I simulate with Spectre XPS the resulting waveforms aren't correct.
The first image was obtained with Spectre APS ++ which is correct.
The second image was obtained with Spectre XPS and selecting the "Digital instances" (which gave the best results so far):
Even the CLK signal which comes from a Vsource is incorrect.
Here is the config window (I tried to only activate XPS, activate and deactivate aps++, change the digital speed to 1, 2 and 3, select the digital instances / analog instances... nothing gets closer to the APS only simulation) :
Now, what is very odd is that I simulate the very same circuit back in 2017 only by selecting XPS without changing the options and it worked fine. The only things that changes were the Spectre version and the server. Could this be a version or server configuration issue?
You will find attached the spectre.out log file.
community.cadence.com/.../spectre_5F00_out.txt
Any ideas are welcome.
Best regards,
Raphael