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Praxis_Kernfeld's avatar
Praxis_Kernfeld
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2 months ago
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Why does Fitter show "Dedicated Pin" as "Reference Clock Source by" for downstream PLL in cascade?

  Hi everyone, I created a design that connects two PLLs in a simple cascaded configuration.   However, I noticed something that seems inconsistent in the Fitter report:  In the...
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  • ShengN_altera's avatar
    ShengN_altera
    2 months ago

    Hi,

    Yes, this is just reporting limitation and will not cause functional impact.

    Please treat "Reference Clock Sourced by" as "Don't Care" for the PLL2 ( downstream side PLL) and rely on the "PLL Refclk Select" section.

Praxis_Kernfeld's avatar
Praxis_Kernfeld
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2 months ago

Hi ShengN,

 

Thank you for the clarification. That makes sense, and I understand now.

I appreciate your support and clear explanation.

 

Best regards,

Praxis_Kernfeld