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

Hi jame.song,

Can you post a small code example that shows the error?

Or post the error message output by Modelsim.

Do you know that your setup is correct?

For example, run one of the simple Modelsim examples I've posted, eg.,

http://www.alteraforum.com/forum/showthread.php?t=32386

or this one

http://www.alterawiki.com/wiki/using_the_usb-blaster_as_an_sopc/qsys_avalon-mm_master_tutorial

(the first is VHDL, the second is Verilog/SystemVerilog, so may be more applicable to testing your setup)

Cheers,

Dave