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TMS320F28335: TMS320F28335 errata issue : Memory Possible Incorrect Operation of XINTF Module After Power Up

Neal Huang
Intellectual 385 points
Part Number: TMS320F28335
Other Parts Discussed in Thread: TPS3806I33-Q1

Hi Sirs,

About TMS320F28335 errata issue: Memory Possible Incorrect Operation of XINTF Module After PowerUp.  

We had two questions as below

1>     Why this problem only happen in some chip?

2>     Why we change the setting of XCLKOUT will improve the problem?

 Thank you so much for your support.

  • 0
    TI__Guru 62975 points
    Neal,

    When any module is not reset properly, some of the internal logic is going to have an unknown, uninitialized "random" value. Certain [random] values are benign to the overall module, whereas other values can have detrimental effects.

    For improper resets during power up, the random value may have a statistical preference (that varies between devices) to be either logic 1 or 0. One cause of this is parasitic leakage that acts upon an internal logic net. If, for example, the leakage toward VDD is stronger than the leakage toward VSS, then the net will most likely resolve to a logic 1 at power up.

    As pertains to your question, you can expect to see variations in behavior between devices based on their individual tendencies to resolve uninitialized logic to either benign or detrimental values.

    I will abstain from speculating as to why changing XCLKOUT may improve the behavior of an improperly reset XINTF module.

    -Tommy
  • 0 in reply to tlee
    Intellectual 385 points

    Hi Tommy,

                     Thank you so much for your reply.

                    Now, we used TPS3806I33-Q1 reset IＣ connect to TMS320F28335 XRS pin. we measured the reset time around 1.2ms and that time match below spec.

    We follow below link to modifies code to test. the issue was solved.

    https://e2e.ti.com/support/microcontrollers/c2000/f/171/p/596465/2192726?tisearch=e2e-sitesearch&keymatch=tms320f28335%20power%20up%20hand#2192726

    Could you more detail information？we need it to confirmed end customer.  

  • 0 in reply to Neal Huang
    TI__Guru 62975 points
    Neal,

    I will ask Vivek about that thread.

    -Tommy
  • 0 in reply to tlee
    TI__Guru 62975 points
    Neal,

    Vivek advised me that the issue you referenced in the other thread was also resolved by following the advisory workaround and no additional investigation was conducted to explain why some of their devices were affected by XCLKOUT clock frequency.

    -Tommy