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TMS320F28377S: F28377S: no response after external reset.

Yang Lei
Prodigy 80 points

Part Number: TMS320F28377S

Hello,

I got a strange issue for a customized F28377S board.

1. When I connect XDS100v3+ to the board and hit "run" in CCS Debug mode, the chip works perfectly. Both RAM.cmd and Flash.cmd work normally.

2. However, after I downloaded the code to the flash and hit the reset button, the chip has no response. XCLK and voltage source are normal. 

3. My last design works normally and I almost copy/paste my last design to the current design. The only difference is that for this design, there're many unused GPIOs I left unconnected. 

4. According to the power consumption, looks like the chip isn't running any program after reset. 

Anyone know what's going on and how to resolve this issue? Thanks a lot!

Best

Yang

  • 0
    TI__Guru** 117281 points
    Hi Yang,

    Have you checked the values on BOOTMODE pins (GPIO72/GPIO84) to make sure they are driven correctly to BOOT device properly?

    Regards,
    Vivek Singh
  • 0 in reply to Vivek Singh
    Prodigy 80 points

    Hello Vivek,

    Several days before, I did find out this issue that I didn't pull up GPIO72 and GPIO84. After I pulled them up, the board works fine. Thanks for the help. 

    The question now is that I didn't pull up these two pins in my last design (they are unconnected). However, that board boot from flash with no problem. So, will the circuit layout affect these GPIOs and BOOTMODE? 

    Best
    Yang

  • 0 in reply to Yang Lei
    TI__Guru** 117281 points

    Hi Yang,

    If pins are floating then the value read by device is not deterministic. It is highly recommended to have pulls on these pins (as needed) so that device boots properly.

    Regards,

    Vivek Singh