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Correct 280xx Boot-mode setting from datasheet

Lawrence Walker
Prodigy 20 points

I am developing on the F2808 device on the C2000 docking station.  The F2808 Data Manual (SPRS230N rev May 2012, p. 35) indicates that the "Boot to Flash" mode requires pins GPIO18, 29, and 34 to be set to 1's.  However, when I jumpered the pins to 1, I wasn't able to "boot to flash" -- I was able to "boot to flash" with pins unjumpered.  I interpret this as setting the pins to 0's which is opposite of what was specified in the data manual.

The schematic of my Docking Station (CC28xxx Docking Station Rel-2, Rev A) appears to be outdated.  This is because the header "pin #1" on the board is HI at (3.3V, which is expected); conversely, the Rev A schematic shows pin #1 grounded through a 20MOhm resistor.

Am  I interpreting the datasheet correctly?  Where can I find updated versions of the F2808 datasheet and Docking Station schematic that is consistent with my setup (F2808 Docking Station USB-EMU [R3])?

  • 0
    TI__Guru 57255 points

    Lawrence,

    Updated documentation for the Docking Station and F2808 controlCARD can be found in the C2000 Baseline software suite.
    (download this from the Software section of the following link: http://www.ti.com/tool/tmdsdock2808)

    Unfortunately, your question isn't very well answered by the new schematics alone.  However, the PCB.pdf does help.  If the jumpers are at "1", the boot pin GPIOs will be pulled strongly to GND.  If they're NOT at "1", no connection is made and the pull-ups on the controlCARD (and the internal pull-ups in the chip itself) dominate and the device will boot from FLASH.

    Hopefully this makes sense.


    Thank you,
    Brett