how to use test bench file(.vhd) to simulate

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Hi,

I think the "native link" feature, that allowed ModelSim-Altera to be started directly from Quartus, was a bit broken.

My suggestion: just use ModelSim by itself.

Create a new project, load all you VHDL (testbench and rtl) and simulate it.

IIRC, with ModelSim-Altera, Altera's libraries will already be loaded when you start ModelSim.

ModelSim comes with some documentation of it's own.

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thanks, I use ModelSim alone now and I've found a document very helpful.