Forum Discussion

lambert_yu's avatar
lambert_yu
Icon for Contributor rankContributor
5 years ago

About fpll recalibration failure problem of transceiver (simplex tx) under cyclone 10

Hi, I am facing one problem, which is about fpll recalibration failure on cyclone 10 board. Just for same .pof file, no timing violation and different cyclone 10 boards, after POR, the transceiv...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi Lambert,


Thanks for your clarification. Based on your responses, there seems to be no issue with the clocks and your recalibration steps. Also, it seems like 2 boards are working but 1 is not. This seems to be something specific to the failing board. Just wonder if you have had a chance to check the following:


1. XCVR related power supplies to see if there is any anomaly with the failing board?


2. Have you got a chance to try with different fPLL to see if similar issue persists? Just to narrow down to specific fPLL only or all fPLLs are showing similar symptom in the failing board.


3. You might also want to use oscilloscope to check on the refclk eye diagram to see if there is any anomaly vs datasheet specs?


4. Just to check after refclk switching, if there is any other fPLL configuration that you are dynamically reconfiguring?


Please let me know if there is any concern. Thank you.


  • lambert_yu's avatar
    lambert_yu
    Icon for Contributor rankContributor
    5 years ago

    Hi CheePin,

    Thanks for your suggetion, now I have found the root cause which is about the cal_busy signal, it's one async signal, the method I use this signal has problem.

    Brs,

    Lambert