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28377 boot mode pins on custom board, advice needed

Roger Périat
Expert 2040 points

Hello

  • In the data sheet of 28377D (section 6.6.5),  a note mentions possible connection problems to unprogrammed devices (wd reset).
  • For our custom board we want to use the get mode to boot to flash (GPIO 1/1)
  • We want to program our devices with CCS 6.1 and XDS200 USB (no mass programming, small series)
  • Since now I have always been able to program an empty device.
  • Sometimes I had problems, but I do not know if the wd was the reason. In case of problems I was able to connect manually, let it run to 0x80000, and then erase all with "OnChipFlash" in CCS. Then problems went away .

Question: Do we really have to foreseen a possibility to select another boot mode to program our devices on the custom board, or will we always have the possibility to connect to empty devices with XDS200 USB (ev. with small troubles, which would be ok)?

Thank you for your advice

Best regards

Roger

  • 0
    TI__Guru** 116971 points

    Hi Roger,

    Sometimes I had problems, but I do not know if the wd was the reason. In case of problems I was able to connect manually, let it run to 0x80000, and then erase all with "OnChipFlash" in CCS. Then problems went away .

    I am assuming you are not using the security feature on this device. If that is correct then you should be able to follow this step and connect to device but it may take few iterations. Having "Wait BOOT" option makes this process clean.

    But if you are planning to use the security feature later then having "Wait BOOT" option is must else JTAG/CCS  connection will not be possible after security passwords are programmed.

    Hope this was helpful. Let me know if you have further questions.

    Regards,

    Vivek Singh

  • 0 in reply to Vivek Singh
    Expert 2040 points

    Hi Vivek

    This is correct, at this time we do not use CSM.

    Thank you for answering this!

    Regards,

    Roger