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FabianL's avatar
FabianL
Icon for Occasional Contributor rankOccasional Contributor
8 months ago
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Arria 10: Remote Update Watchdog unpredicted behavior

Hello,   I start a new thread here, since the previous thread is not answered anymore after the transformation from Intel to Altera Forum. All details and data is still valid from the original thre...
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Programmable Logic Device
  • Farabi_Altera's avatar
    Farabi_Altera
    7 months ago

    Hello Fabian, 

     

    Thanks for the reply. 

     

    Functional error in that context is when the logic that is responsible to reset the WD timer fails to do its task, which will initiate a fallback mechanism. The third paragraph actually correlates with the first paragraph. Factory fallback needs to meet certain conditions when in application configuration for it to happen, so expecting the fallback mechanism to occur with everything working correctly is a wrong understanding. 

     

    regards,

    Farabi

FabianL's avatar
FabianL
Icon for Occasional Contributor rankOccasional Contributor
7 months ago

Thanks for the clarification. So this is clearly the expected behavior, that is fine for our application.

I'm still missing an answer to the Watchdog Timeout:

  1. What is the unit of the watchdog timeout register? This is not specified in its datasheet/documentation.
  2. You stated "Please make sure the watchdog timeout not too. eg. Dont set RU_WATCHDOG_TIMEOUT = 0xFFF (this is too long)". Why is this too long? I am missing any restrictions in the respective datasheet.

 

best regards

Fabian

  • Farabi_Altera's avatar
    Farabi_Altera
    Icon for Regular Contributor rankRegular Contributor
    7 months ago

    Hello Fabian, 

     

    A unit of the watchdog timer is 1/f, and f is the frequency of internal oscillator. 

     

    Based on datasheet, by right it should be 1/7.9MHz for a unit time (nominal calculation).  

     

    regards,

    Farabi

     

  • Farabi_Altera's avatar
    Farabi_Altera
    Icon for Regular Contributor rankRegular Contributor
    7 months ago

    Hello Fabian, 

     

    Do you have further question? 

     

    regards,

    Farabi

    • FabianL's avatar
      FabianL
      Icon for Occasional Contributor rankOccasional Contributor
      7 months ago

      Hello Farabi,

      actually yes, as pointed out in my last post I'm missing answers concerning the  Watchdog Timeout:

       

      1. What is the unit of the watchdog timeout register? This is not specified in its datasheet/documentation.
      2. You stated "Please make sure the watchdog timeout not too. eg. Dont set RU_WATCHDOG_TIMEOUT = 0xFFF (this is too long)". Why is this too long? I am missing any restrictions in the respective datasheet.

       

      best regards

      Fabian

      • Farabi_Altera's avatar
        Farabi_Altera
        Icon for Regular Contributor rankRegular Contributor
        7 months ago

        Hello Fabian, 

         

         

        The watchdog timer is range between 1/f (2^0) and 2^29. If you convert to seconds. the range is between 1/7.9Mhz(1.26ns) ~ 67 seconds. 

         

        regards,

        Farabi