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Altera_Forum's avatar
Altera_Forum
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8 years ago

How to simulate NCO using Modelsim

hello,

i want to implement a pipeline ADC and I need to use a sine input, i just learned that i can use NCO to generate the waveform,

when i compiled in quartus ii, there are errors like "Error (204009): Can't generate netlist output files because the license for encrypted file "***/nco-library/asj_nco_madx_cen.v" is not available", and someone told me i should compile and simulate directly in Modelsim.

So i tried Modelsim and i have some questions on simulation:

Altera guidebook suggests that i should add .vo file to the compile directory, and i compiled it with my top-level verilog file and testbench, but there are errors when simulating like "Error: (vsim-3033) Instantiation of 'altmult_add' failed. The design unit was not found.", i dont know how to deal with that.

furthermore, do i need to specify the precompiled libraries?

just as the page suggests(http://quartushelp.altera.com/15.0/mergedprojects/eda/simulation/modelsim/eda_pro_msim_func_sim.htm)

thanks in advance~

4 Replies

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

    --- Quote Start ---

    Yes, you will need to point ModelSim at some pre-compiled libraries.

    Refer to Altera's "modelsim tcl scripting examples (https://www.altera.com/support/support-resources/design-examples/design-software/tcl/tcl-modelsim.html)" for details on using the Altera libraries for simulation. The scripts encompass libraries for all devices - you can strip out what you don't need.

    Cheers,

    Alex

    --- Quote End ---

    Thanks, Alex. I just used RAM IP to generate sinewave. But I don't really get it when I simulate in ModelSim why I need to add some libraries like eda/sim_lib/220model.v and eda/sim_lib/altera_mf.v to make my simulation work. How can I know which lib I need to add before simulation?

    Thanks in advance :)
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    8 years ago

    Then you probably only need the altera_mf.v (Altera Mega Function) library.

    How do you know? The datasheet/documentation that comes with the IP or megafunction should identify which libraries are required. However, I'll admit to personally using a more iterative process - trial and error...

    Cheers,

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

    --- Quote Start ---

    Then you probably only need the altera_mf.v (Altera Mega Function) library.

    How do you know? The datasheet/documentation that comes with the IP or megafunction should identify which libraries are required. However, I'll admit to personally using a more iterative process - trial and error...

    Cheers,

    Alex

    --- Quote End ---

    Thank you, Alex~