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wheelie's avatar
wheelie
Icon for New Contributor rankNew Contributor
4 years ago

ALTPLL settings trouble on MAX10

Trying to generate single 96MHz uncompensated output from a 25MHz reference. When using the parameter editor, closest it will get me is 96.022727MHz. I would think that N=5, M=192, and C=10 would do the trick, giving a VCO frequency of 960MHz. However cannot figure how to enter that as only gives 1 input each for a multiplier and divider. What am I doing wrong? Thanks in advance

2 Replies

  • Ash_R_Intel's avatar
    Ash_R_Intel
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    Hi,

    You are not doing anything wrong in the settings, but somehow for this frequency 96MHz, the tool chooses the M, N and C values on its own which slightly deviates from the exact requested one. If you need the exact number, you may try cascading the PLLs and see if some settings match your requirements.

    Meanwhile I will check with the tool team on this behavior.


    Regards.


  • Ash_R_Intel's avatar
    Ash_R_Intel
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    Hi,

    Received an response from internal team that this is expected behavior of the tool. It calculates the optimum values of M, N and C.


    Regards.