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Altera_Forum's avatar
Altera_Forum
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17 years ago

FFT megafunction simulation in Modelsim

Hi,

I'm trying to get a standalone FFT megafunction simulation running in Modelsim Altera Starter 6.5b (generated with QII 9.1, Verilog). I generated the simulation model and compiled the .vo and _tb.v files successfully. Now starting the simulation of the testbench, Modelsim generates dozens of warnings similar to: 

# ** Error: (vsim-3033) D:/hardware/components/modelsim/fft64_test.vo(6204): Instantiation of 'altmult_add' failed. The design unit was not found.#          Region: /fft64_test_tb/dut#          Searched libraries:#              D:\hardware\components\modelsim\work
Now that would make me believe that some libraries are missing. Modelsim is a fresh install and the FFT user guide doesn't give me any hints on that problem. Do I need to compile something else into my work library?

Any help is greatly appreciated!

Cheers,

Andy

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    17 years ago

    I did some more digging. All necessary libraries are there, I even tried to reference them directly in the modelsim.ini. They all appear in the GUI. However vsim seems to ignore them.

    How can I tell Modelsim to use the libs? I didn't find a reference how to do that. The setup seems fine for me...
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    I have the same problem and i didn't found any solution :mad:. Do you have a idea for me?

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    I've hit the same problem too. I'm sure there must be a simple solution. I wonder if anyone has a simple, step by step guide explaining the necessary steps to get the FFT IP compiled properly, allowing modelsim simulations.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    I am having the same issue, did you guys know were we can get that step-by-step guide??