ATX PLL Stuck In Calibration

Question

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.

cheepinc_altera · Answer

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.

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ATX PLL Stuck In Calibration

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