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TMS320F280049: Watchdog functions: can be 'disabled' by somehow servicing it artificially?

Wilson Pang
Intellectual 590 points

Part Number: TMS320F280049

Hi TI experts,

I am trying to find out whether the watchdogs in C2000 can be 'disabled' by somehow servicing it artificially.

My goal is to prevent XRSn pin from being pulled LOW internally by the reset of either one of these 2 watchdogs (WDRS^ and NMIWDRS^).

Could anyone helps to advise? Thanks.

  • 0
    TI__Guru** 117051 points

    Hi Wilson,

    What exactly you are trying to avoid ? There are also some protection in HW to avoid accidently triggering the WD to issue a reset. NMIFLG registers are also EALLOW protected. 

    Regards,

    Vivek Singh

  • 0 in reply to Vivek Singh
    Intellectual 590 points

    Hi Vivek,

    Apparently, some of my teammates are using Push-Pull type Output from a Master MicroP to drive this XRSn pin (Open Drain) of C2000 which is the Slave MicroP.

    I think it is very dangerous when a Master MicroP Push-Pull pin is driving HIGH directly to XRSn pin when it is internally pull LOW by C2000 during WDRS^ or NMIWDRS^. There will be a Shoot Through from the Master MicroP supply to the ground through C2000 XRSn pin.

    So I am trying to analyze this from DFMEA perspective.

    I will try to provide a simple hardware interface (using some discrete circuitry) to avoid this Shoot Through phenomenon.

    regards

    Wilson.

  • 0 in reply to Wilson Pang
    TI__Guru** 117051 points

    Hi Wilson,

     Apparently, some of my teammates are using Push-Pull type Output from a Master MicroP to drive this XRSn pin (Open Drain) of C2000 which is the Slave MicroP.

    Yes, that is not good. That means XRSn pin should never be driven low by device which is not possible. I would suggest to change external driver to make it open-drain.

    Regards,

    Vivek Singh

  • 0 in reply to Vivek Singh
    Intellectual 590 points

    Thanks for your comments and feedback, Vivek.

    Yes. I will ensure that the C2000 XRSn pin is protected by having an Open-Drain connected to it.

    Appreciate your support.