simulation problems:Warning: (vsim-3473) Component instance "i1 : ex1" is not bound.

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Modelsim needs to compile all the components in your design. This message means that you have not told Modelsim to compile the component ex1.

Your filename looks a little weird, is ex1.vht supposed to be your testbench file? A more normal convention would be the component source is ex1.vhd and the testbench source is ex1_tb.vhd.

But since you said that your top-level design was a schematic, perhaps that it just what Quartus generates. In that case, you may have a problem with your top-level design being called ex1, and your component being called ex1. If that is the case, change your schematic name to ex1_top.

Cheers,

Dave

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thanks for the help!

i am new guy to altera, maybe i am not familiar to the quartus tools, but i feel the simulation of the quartus is not as friendly as ise.

how can i do if i want to sim one of the vhd file of the project?

is there any manual or handbook for new ones to study how to simu a project?

thanks!