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Altera_Forum's avatar
Altera_Forum
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14 years ago

Megafunction ALTPLL simulation Problem

Dear all,

Please help me with this issue:

I want to simulate Megafunction ALTPLL in ModelSim,

The result of ModelSim compilation is no Error, but the output is High Z

The waveform is shown in attached file "PLL_waveform.jpg".

(1)The Resolution of Modelsim is set to ps.

(2)altera_mf.v and 220model.v are included.

Would you please give me a hint or a direction to debug this?

Thank you in advance!

Best Wishes,

William

3 Replies

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

    did you search the log for warnings? i would look for a component not bound to start

    which family of ModelSim are you using (AE/SE)?
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    Hello thepancake,

    Thank you for responding.

    I didn't see any warnings about PLL or megafunction.

    Best Wishes
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    hi,

    I go the same problem too. using the DE0-Nano board and follow the ALTPLL and Mux design in the baord user guide. when doing the Modelsim RTL simulation with lpm_ver and altera_mf_ver included, the C0 output just get hiZ. any advice?

    I convert the bdf to verilog format before using nativelink to trigger the modelsim-altera simulator. the C0 output just show hiZ. dont know why? I attached my project design file here, pls help.