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TMS320F2808: GPIO29 suddenly low will lead to F2808 cannot boot normally

user4637774
Intellectual 790 points

Part Number: TMS320F2808

Tool/software:

When the F2808 is powered on, GPIO18, GPIO29, and GPIO34 are pulled up to enter the boot mode and ROM is started.
If during this process of loading the program.Is the GPIO29 voltage suddenly low, causing the boot mode to change and causing boot failure?

  • 0
    TI__Guru* 86290 points

    Yes, during the Boot ROM execution the FW does a read of these 3 GPIOs to determine the boot mode.  If the pin state is not held in the correct state during the BROM execution, this could lead to an incorrect boot mode getting selected by the device.  Below table from page 37 of the datasheet gives the hold time for the boot pins to be read correctly.

    Best,

    Matthew