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RClan2's avatar
RClan2
Icon for New Contributor rankNew Contributor
5 years ago

ATX PLL Stuck In Calibration

I have an Arria10 design which includes an ATX PLL. The design operates properly on most boards but on about 10% of boards the ATX PLL never exits calibration ( i have verified the frequency of the refclk on chip as well as all voltages). I am basically fishing for anyone who has seen this behavior and what they found to be the root cause of their problem as that may apply here as well.

Thanks.

1 Reply

  • CheepinC_altera's avatar
    CheepinC_altera
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Hi,


    As I understand it, Andy seems to have helped open an IPS case on this. I have responded to the IPS especially on the CLKUSR requirement. Please let me know if you would require further clarification. Thank you.