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CC2642R: Advisory Sys_01 bootloader,

paddu2017
Expert 2885 points

Part Number: CC2642R

Hi,

With regards to "Advisory Sys_01" mentioned in the latest errata, it is bit difficult to understand
the exact scenario on how this errata will occur.

1.It is mentioned that "noise on the JTAG TCK pin", does it mean it occurs only during debug mode?
  or is it during normal operation?

2.It also mentions about the below case.
"The input buffer controlled by IOC.IOCFGn.IE is enabled and the DIO input value is
the same level as the CCFG bootloader pin level (BL_LEVEL) when entering
Shutdown (GPIO input values are latched when entering Shutdown)"

-> DIO here means any GPIO pins or is it the only pin defined in BL_PIN_NUMBER ?

Please let me know if there is any example use case to understand how this errata could occur.

Best Regards
paddu

  • 0
    TI__Guru** 106705 points
    Hi Paddu,

    For details on "noise on the JTAG TCK pin" refer to the ICEMelter chapter in the Technical Reference Manual, www.ti.com/lit/pdf/swcu185 chapter 6.4.

    DIO means the actual BootLoader pin. Basically, if you accidentally wake up from Shutdown AND the BootLoader enable pin is active the device will go to the BootLoader.

    Regards,
    Fredrik
  • 0 in reply to Fredrik K
    Expert 2885 points
    Hi Fredrik,

    Thank you.

    This errata prerequisites mentions this issue basically occurs with JTAG TCK pin,
    so we could avoid the issue by also connecting JTAG TCK pin with strong external pullup?

    Best Regards
    paddu
  • 0 in reply to paddu2017
    TI__Guru** 106705 points
    Hi Paddu,

    That is correct. We have only observed TCK wake-ups in designs with long traces on the TCK net which are prone to picking up noise. Also note that there is a time window which the pulses has to occur within, so the likelihood for this happening is low.

    Best regards,
    Fredrik