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Original question:

AM5716: SD bootup issue

AM5716: SD bootup issue (continued)

Takayuki Miyazaki
Genius 10120 points
Part Number: AM5716

This thread is related to https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1049938/am5716-sd-bootup-issue/3935213#3935213 

Hi Experts

I’m sorry for my late response. I received customer’s feedback today, but, customer mentioned they were Not able to connect to a15_0 core with non-working board…

How should we do analysis for this failure device ?

Can I have your further advice, please?

Best regards,

Miyazaki

  • 0
    TI__Mastermind 42135 points

    Hi Miyazaki,

    As they are not able to connect using CCS as well, this is not just SD boot issue anymore. It looks like something went wrong during the assembly and some connectivity is broken. Looping in hardware experts here for more perspective.

    Regards,
    Parth

  • 0 in reply to Parth Nagpal
    TI__Guru 51695 points

    As mentioned in linked post -- to track down a design or manufacturing issue on a board, begin verifying all power supplies are correct voltage and enabled in correct order.  Next step is to verify all clocks are proper frequency and supplied at correct time, followed by all reset timing is correct.  Those items need to be verified before any additional debug can be done.

  • 0 in reply to Robert Eschler
    TI__Genius 10120 points

    Hi Robert、

    Although customer double-checked the power supply and clocks are also connected correctly, there is not any problem. Therefore, I’m requesting customer to check power sequence and reset-timing.

    Best regards,

    Miyazaki

  • 0 in reply to Takayuki Miyazaki
    TI__Genius 10120 points

    Hi Robert、

    I received customer’s feedback today. Customer checked the power supply, all clocks, power sequence and  reset-timing  with non-working board , however, customer mentioned they were not able to find any problem.

    By the way, when customer used LAUTERBACH’s JTAG emulator, it seems customer was able to connect AM5716 and confirmed some operation, a little bit. Therefore, customer supposes there are some hints for this issue in this point. Can we have any further comments, please?

    Best regards,

    Miyazaki

  • 0 in reply to Takayuki Miyazaki
    TI__Guru 51695 points

    The JTAG interface may contain a reset signal to control the reset of the device.  (Note I'm NOT referring to the JTAG reset signal (TRSTn).  Our EVM includes this reset connection to the processor.  It possible the customer board did not implement this properly, and different emulators are asserting the reset in differently.

    Also - could it be a manufacturing issue (and the processor is not completely/correctly soldered to the board)?  Is it just a single board not working correctly?

  • 0 in reply to Robert Eschler
    TI__Genius 10120 points

    Hi Robert,

    I received response from customer. Yes, it is just a single board at this time. Also, customer executed X-ray analysis around AM5716 device, however there is not any solder-defects. Is there possibility that it is EOS/ESD issue?

    Best regards,

    Miyazaki

  • 0 in reply to Takayuki Miyazaki
    TI__Guru 51695 points

    Yes - EOS/ESD is certainly possible.  Since other boards are behaving correctly, this does not appear to be a design issue.