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floating point DSP 6713 halts at power up

Jennifer
Prodigy 80 points

 i m using C6713 floating point processor. the regulators being used for power section are 3.3V and 1.2V regulators.

the problem is that DSP halts at start up and when it is reset again and again it starts working without any error.

i am working on this issue for around 3 months but the problem is still there. i have also increased the current rating of both regulators but nothing works.

 

Kindly suggest a solution for this problem.

  • 0
    TI__Guru*** 125430 points

    I imagine it's due to improper termination on one of the pins.  I would check the following:

    • nTRST pulled low
    • EMU0/1 pulled high
    • Reserved pins terminated as required by data sheet
    • "Do not oppose" pins at levels determined by internal pull up/down in data sheet
  • 0 in reply to Brad Griffis
    Prodigy 80 points

    I have checked all the terminations recommended in your last post. All the terminations are according to datasheet.

    actually the problem is that at power up, this floating point DSP C6713 is held in an indeterminate stage that even it can't respond to reset signal.

    Kindly tell any other scenario due to which processor may halt.

  • 0 in reply to Jennifer
    TI__Guru*** 125430 points

    What's the reset circuitry look like?

  • 0 in reply to Brad Griffis
    Prodigy 80 points

    i m using regulator IC TPS70345 to generate reset.here Vout1 is 3.3V and Vout2 is 1.2V.

  • 0 in reply to Jennifer
    TI__Guru*** 125430 points

    All the requirements are listed in the data sheet.  The 6713 is a mature and robust part.  I personally have many customers using it with many designs per customer.  Every single issue I've ever encountered similar to this one has ultimately been due to a data sheet violation.  In particular I would look again at those "do not oppose" pins (on the HPI if I remember correctly).  Put a scope on your board and trigger off the reset line.  It's important to see the state of those pins on the rising edge of reset.  I've seen a number of cases where customers thought the pins were pulled to the appropriate rail, but the component to which they were connected was driving a voltage on the pins at power up or something along those lines.