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TMS320F280049: Which reset source will cause the "clear" of RAM data on F280049

Sheldon He
Expert 8585 points
Part Number: TMS320F280049

Hi expert,

On F2837x device, a watchdog reset will clear the data in RAM, this is clearly mentioned in the TRM. But for F280049 the words are not that clear whether a watchdog reset will do the same thing (clear RAM). What does "all of almost all of the device" exactly mean below? Hope there are more details for the behavior of reset group 1 and 2. Thanks!

Sheldon

  • 0
    TI__Guru** 113665 points
    Sheldon,

    On F280049 device, WD reset will not clear the RAMs.

    It says "all or almost all" because some logic in device gets reset by POR only and not by other resets in that group.

    Regards,

    Vivek Singh
  • 0 in reply to Vivek Singh
    TI__Expert 8585 points

    Hi Vivek,

    Do you mean the only way to clear the content in F280049's RAM by some kind of reset is POR?

    If not, what are the other way?

    BTW, why F2837x and F28004x do differently on watchdog reset?

    Thanks

    Sheldon 

  • 0 in reply to Sheldon He
    TI__Guru** 113665 points

    Sheldon,

    Do you mean the only way to clear the content in F280049's RAM by some kind of reset is POR?

    After POR, BOOTROM clear the that RAMs but you can use the RAM Init feature (please refer memory Controller section in TRM) to clear the RAM content.

    BTW, why F2837x and F28004x do differently on watchdog reset?

    On F2837x device we have Hibernate feature due to which BOOTROM code clears the RAMs after WD reset as well. This feature is not applicable to F28004x device hence RAMs are not cleared on WD reset.

    Regards,

    Vivek Singh

  • 0 in reply to Vivek Singh
    TI__Expert 8585 points
    Hi Vivek,

    I go through the TRM, in my mind, entering Hibernate mode and wake up some time after will not influence the data retained in M0 and M1 memory. So, after a flash API firmware updated, is it possible to do a HIB and wake up to refresh the device (some kind of restart) while realize data retention in M0 and M1?

    Sheldon
    Thanks
  • 0 in reply to Sheldon He
    TI__Guru** 113665 points

    Sheldon,

    Hibernate feature is not available on F280049 device.

    Regards,

    Vivek Singh

  • 0 in reply to Vivek Singh
    TI__Expert 8585 points
    Viviek,

    I mean on F28379D device. Is that possible?

    Sheldon
    Thanks
  • 0 in reply to Sheldon He
    TI__Guru** 113665 points
    Yes, that should be ok but please note that once device enters into hibernate, it has different wake-up and boot mechanism. I would not recommend using hibernate for such use case.

    Regards,
    Vivek Singh