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sambesse's avatar
sambesse
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1 year ago
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Cyclone 10 LP PLL frequency far too low

Hello, I am working on a Cyclone 10 lp problem using an internal PLL. I'm using the above AHDL code to configure it. The expected output is 245Mhz, since it's a 30.72MHz input and a mu...
  • FvM's avatar
    FvM
    1 year ago
    Hi,
    the small differences is frequency are obvious, you should be able to provide consistent values. However none of the quoted warnings is related to a fundamental problem that would prevent PLL function.

    Some questions.
    What's the reference clock source?
    Is it a known working development board or custom design? In the latter case, are you sure that all hardware requirements, e.g. connection of PLL supply pins are met?