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When I try to run a Spectre dc and trans simulation with my 8-bit-adder circuit, have an internal error stopping the simulation. I get the following messages in the spectre log window:
1) the usual "unable to compile ahdlcmi module library" message (which has not stopped my simulations in the past),
2) a warning from spectre during initial setup about having PMOS and NMOS from the driver circuit running at 1 A/exceeding imelt = 10 mA (the test driver/load circuit provided by our course instructor)
3) "Internal error found in spectre during topology check, during initial setup." --> "Assertion failed in file 'topology.c' at line 1008"
Any ideas how to interpret error #3?? I've done the Virtuoso save and check with no error for the 8-bit-adder or any of the lower schematics in the hierarchy.
To explain how I'm implementing an 8-bit-adder: The design is four 2-bit-adders linked together. Each 2-bit-adder is made of 2 individual adders. Individual adders have Carry Out implemented with CMOS and Sum implemented with pass-logic transistor gates.
Thank you for your time.
In reply to Andrew Beckett:
Spectre 5.1.41 USR1 it says.
In reply to CPete:
You're using a version of spectre built 6.5 years ago. That doesn't make sense, given that there have been 7 major releases of the analog simulators since then. In 2004 we split off the simulators from the IC stream, and have released MMSIM60, MMSIM61, MMSIM62, MMSIM70, MMSIM71, MMSIM72 and most recently MMSIM101. The version of spectre in the IC5141 has not been maintained for some time (although since you're using USR1 which is from December 2004, that's irrelevant).
I would suggest you try installing a recent MMSIM version; I would expect the problem to go away as there have been many advances in the last 7 years.
Much agreed. However, this version is provided by our university, who I imagine have no incentive to update unfortunately.
I did solve my internal failure issue by taking my wires which were previously sharing common names, but not connected, and hard-wired them together in the schematic. I'm sure the circuit logic is correct, but somehow the provided driver circuit and my adder circuit were not simulating well together. Thanks again for the help.
I can't really see how that would help, since presumably the resulting netlist would be the same - spectre has no visibility of the schematic. I can only assume that something subtle changed which allowed it to proceed.
Most universities would be using more recent versions than that - even if the IC version is old. But I agree, things may be more constrained there.
I am using -- Setup Cadence IC 6.1.5_HF132
And I am getting the following errors -
Internal error found in spectre during check, during IC analysis, during periodic steady state analysis `pss'. Please run `getSpectreFiles' or send the netlist, the spectre log file, the behavioral model files, and any other information that can help identify the problem to firstname.lastname@example.org. FATAL (CMI-2010): Assertion failed in file `check.cc' at line 518. FATAL (SPECTRE-21): Assertion failed.
In reply to Conhas Thakkar:
Given that the assertion is coming from the simulator, what matters is the MMSIM version you're using, not the IC version. The spectre subversion should appear at the top of the spectre log file. What does that report?
Please find the following -
Setup Cadence IC 6.1.5_HF132 Setup Cadence Assura 4.1.2_HF20 for IC 6.1.5_HF132 Setup Cadence PVE 11.12_HF106 for IC 6.1.5_HF132 Setup Cadence MMSIM 11.10_HF509 for IC_6.1.5 HF132 Setup Cadence INCISIV 12.1_HF005 Setup Cadence CONFIRM 11.10
Thank you very very much
Your version of MMSIM (11.1) is quite old and no longer supported. It is quite likely the issue has been fixed in a more recent version of MMSIM. Please consider upgrading to MMSIM15.1 ISR4 (or later).
Customer Support Director - Analog/Mixed-Signal/RF AEs
Cadence Design Systems, Inc.
Thank you very much Andrew for your help.
In reply to Tawna:
Thank you for your response.
Curently I am using the following -
Setup Cadence/IC_6.1.6 Setup Cadence/PVS_14.1 for IC_6.1.6 Setup Cadence/Assura_4.1.4 for IC_6.1.6 Setup Cadence/MMSIM_13.11 for IC_6.1.6 Setup Cadence/INCISIVE_14.10
And still I am getitng the assertion errors.Can you please help with the same?
I found a CCR (1355410) with exactly that error which was fixed in MMSIM14.1 ISR4. The version you've selected is at least a couple of years old, so I'd definitely suggest trying to move to something that is more recent than MMSIM14.1 ISR4.
We've certainly seen this failing when using models from Global Foundries.