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Asaf_Bloch's avatar
Asaf_Bloch
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1 month ago

Cold Temperature Issue

Hallo, We used the Agilex5 device in AS configuration connect to external QSPI Flash. We apply Smart VID interface at the device demands.  When we perform Cold power up at -40C the device is not c...
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Programmable Logic Device
Asaf_Bloch's avatar
Asaf_Bloch
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1 month ago

Hi dpcsu,

Thanks for your reply

Our voltage rail sequence is VID, 08V -> 1.8V -> 1.2V, 3.3 VCCIO

We detect the POR issue because we don't see any signal transitions after power up (nStatus, PMBus), JTAG detect the device.

How did you read the SDM ROM?

  Any way we repeat the test with other PCB and it pass successfully, so we examine if it specific PCB issue.

regards

Asaf 

Farabi_Altera's avatar
Farabi_Altera
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1 month ago

Hello Asaf, Peter, 

 

Do you have update? 

 

regards,
Farabi

  • dpcsu_e's avatar
    dpcsu_e
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    30 days ago

    Hi Farabi, in our case it was 1.8V ramping up faster than 200us, adjusting softstart capacitor solved it.

    • Farabi_Altera's avatar
      Farabi_Altera
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      30 days ago

      Hi Peter, 

       

      Noted. Good to hear you solved the issue, I will close this case. 

       

      regards,

      Farabi

  • Asaf_Bloch's avatar
    Asaf_Bloch
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    22 days ago

    Hello Farabi,

    After re-heating the FPGA at assembly house, we run cold power-up again and the issue still exist,

     I do not see nSTATUS rising after nCONFIG rising.

    Do you have any advise what to check?

    Thanks

    Asaf

       

    • Farabi_Altera's avatar
      Farabi_Altera
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      21 days ago

      Hi Asaf, 

       

      Before reheating the FPGA at assembly house - power up successful

      After reheating the FPGA at assembly house - power up fail

       

      Is above statement correct? 

       

      My question : 

      1- How many boards fail? how many boards pass? 

      2- what is the purpose of re-heating at assembly house?

      3- Is it possible to check solder cracks using xray? 

      4- nSTATUS not rising meaning device not starting configuration- still in reset mode. Can you check power rails are stable? 

      VCC, VCCIO_SDM etc

       

      regards,

      Farabi

    • Farabi_Altera's avatar
      Farabi_Altera
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      16 days ago

      Hello Asaf, 

       

      Can you reply? 

       

      regards,
      Farabi

    • Farabi_Altera's avatar
      Farabi_Altera
      Icon for Regular Contributor rankRegular Contributor
      15 days ago

      Hello Asaf, 

       

      As there is no response. Please let me set this case to close. 

       

      regards,
      Farabi

      • Asaf_Bloch's avatar
        Asaf_Bloch
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        8 days ago

        Hello Farabi,

        Sorry for the late respond, I am on vacation, back to work next week,

        Any way as I understand from my colleagues, the cold start issue happened again on other system so please don’t close this case

        Thanks

        Asaf