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TMS320F28P559SJ-Q1: MCU reset due to NMIWDRs

Shuqing Zhou
Intellectual 1745 points
Part Number: TMS320F28P559SJ-Q1

Tool/software:

Hi experts,

I ask this for my customer.

They are using their own board and own application.

And they find after running a period of time, the PWM pulse will be pull down.

Then they measure the XRSn pin and 3.3V, and find it exists some noise in the 3.3V(Channle 1 is PWM, Channel 2 is XRSn, channel 3 is 3.3V)

It seems 3.3v have a higher voltage than recommend range, but this time is too small.

Then we connect the debugger, and find NMIWDRs and UNCERR is set.

1. From the register, it seems may be ECC error in FLASH/RAM/ROM happens and let MCU reset, is it right?

2. The NMIFLG is not set, is it because the register will clear after SYSRST? The NMISHDFLG is set, is it because the register only be clear after PORRST?

3. What's the possible reason for this ECC error? Is it may be caused by 3.3v noise?

4. How to handle this situation after the MCU reset caused by NMIWDRs? Because 3.3v noise will happened sometimes due to the interference from system power and this interference is momentary and won't last long. This noise is hard to avoid and customer's hardware is fixed now.

BRs

Shuqing

  • 0
    TI__Expert 5520 points

    Hi Shuqing.

    I will be able to review this by Wednesday.

    Regards,

    Rajeshwary

  • +1 in reply to Rajeshwary Nitin Bongirwar
    TI__Expert 5520 points

    Hi Shuqing,

    Shuqing Zhou said:
    1. From the register, it seems may be ECC error in FLASH/RAM/ROM happens and let MCU reset, is it right?

    Yes, an Ecc error happened and may have triggered the NMI interrupt.

    Shuqing Zhou said:
    2. The NMIFLG is not set, is it because the register will clear after SYSRST? The NMISHDFLG is set, is it because the register only be clear after PORRST?

    Yes, that's correct.

    Shuqing Zhou said:
    3. What's the possible reason for this ECC error? Is it may be caused by 3.3v noise?

    It could be noise, resulting in corruption of the FLASH/ROM/RAM region.

    Shuqing Zhou said:
    4. How to handle this situation after the MCU reset caused by NMIWDRs? Because 3.3v noise will happened sometimes due to the interference from system power and this interference is momentary and won't last long. This noise is hard to avoid and customer's hardware is fixed now

    First narrow down where corruption is happening. If it is happening at random location then user might have to implement some checksum logic to verify if application is corrupted then reload the code.

    Regards,

    Rajeshwary