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KWang97's avatar
KWang97
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

After watchdog for dual-config is enabled, the FPGA seems like not work properly every dozens of seconds. Why?

FPGA communicates with another FPGA with PHY chip. Normally(watchdog enable checkbox not checked), the PHY link led is always off when communication is good. While after I enble watchdog for dual-config(watchdog enable checkbox checked) and set watchdog value to any value, the link led will be on for about 2 seconds and return to be off. This will also be repeated after dozens of seconds. Why? How will I use the watchdog for dual-config? I didn't run remote update after power-up and the FPGA just run application firmware(just ethernet communication with another FPGA using PHY chip).

Attached file is my fpga code for the dual-config.

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  • KWang97's avatar
    KWang97
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    It's the same when I set timer to 0xFFF.

  • JohnT_Altera's avatar
    JohnT_Altera
    Icon for Regular Contributor rankRegular Contributor
    6 years ago

    May I know if you are able to read msm_cs whenever PHY communication is down?

  • KWang97's avatar
    KWang97
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Maybe I could and I can have a try if you need.

    Anyway, I am sure reconfig didn't happen and just PHY comminication goes wrong. I have two PHY communication path with the same phy chip in my master board which communicate with a slave board which also have two PHY path. In th slave board, One phy chip is the same PHY chip with master board, the other phy chip is different But they can communicate well without enabling watchdog. After I enable wathdog,the same phy chip works well while different phy chip will meet problems like what I mentioned.

  • JohnT_Altera's avatar
    JohnT_Altera
    Icon for Regular Contributor rankRegular Contributor
    6 years ago

    Hi,

    Thanks for the explanation. It looks like something went wrong when you enable the watchdog timer. I think you will need to signalTap into your design to understand what is causing the PHY communication to break down. Cause the working chip does not face any issue and the reset watchdog timer should be working correctly.

  • KWang97's avatar
    KWang97
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Yes, there must be sth wrong with enbale watchdog. But I don't know what's the problem so I ask you about this. After all, the problem only happens when I enable watch dog. I still don't know where should I go and Anything else to recommend to look into? So can heip me to find the problem.

  • JohnT_Altera's avatar
    JohnT_Altera
    Icon for Regular Contributor rankRegular Contributor
    6 years ago

    Hi,

    You need to look into your PHY Communication interface and check why it is breaking down. I don't think that the watchdog timer can cause any issue on this except that watchdog timer times out and cause reconfiguration to happen.

  • KWang97's avatar
    KWang97
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    But only when I enbled the watchdog did problems come, so I think there is sth to do with watchdog. I will go on looking into it and hope you could give me some solutions or comments about this if you have further findings. I would also hope could you please ask about this issue with your colleagues and maybe get some ideas. Thanks very much!

  • JohnT_Altera's avatar
    JohnT_Altera
    Icon for Regular Contributor rankRegular Contributor
    6 years ago

    Hi,

    I will need to further understand your PHY link and how it work on your design to understand what is actually happening to further understand what is happening. The reason is that watchdog timer will cause the Max 10 device to reconfigure if it is not reset correctly.

  • KWang97's avatar
    KWang97
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    After problem occurs(PHY Link LED become on from off), the SignalTap also go into Invalid Jtag configuration. What can get from this phenomenon?

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