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.
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?