How to add path to Modelsim to correct "the design unit was not found"?

Thank you, I can see the component is listed in the Library window of Modelsim (as shown in attached pic).

But Modelsim seems can not find it to compile.

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That sounds like a Cyclone III low-level component. Usually those types of things are in quartus/eda/sim_lib/cycloneiii_atoms.v, which is pre-compiled for Modelsim-ASE. However, I just searched the sim_lib/ folder and could not find that component (11.1sp1 installation).

If you can find where that component is located, then you can add the folder with the vlog +incdir+ option (see vlog -help).

Cheers,

Dave

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