Honored Contributor
Honored ContributorWhenever you get an internal error, file a service request at https://mysupport.altera.com/. Provide the Quartus project that produces the internal error and instructions that will enable an applications engineer to reproduce it.
The cause of an internal error could be a bug in Quartus or something you did wrong for which Quartus doesn't have a more graceful error message. AMERGE and atm look like something to do with incremental compilation. (Incremental compilation stores the results for each design partition in an .atm file, and partition merge is a compilation step with incremental compilation.) Maybe you can use SignalTap without trying to preserve previous compilation results with incremental compilation. It will make your compile time longer, but maybe it will let you continue with your design debugging.
