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DP83849ID: 5~10 seconds delay to recognize port when power on (ethernet link)

TS Yang
Genius 4800 points
Part Number: DP83849ID

Hello,

I'm using TI's DP83849ID for a long time. It is applied to current PLC model and used for about 10 years..

It was confirmed through ABA and BAB swap that the delay occurred in DP83849.

We could not find anything unusual when we approached the software.

The design part of DP8389IDVS / NOPB is also referenced to reference design.

In case of cross cable, not direct cable, communication delay (10 ~ 15 second boot delay phenomenon) is irregularly generated by 12pcs or more from the end of 16th year.

Requests
- Request to confirm whether there is a way to confirm that E.Phy (DP8389IDVS / NOPB) is functioning normally, not only externally / electrically.
- Systematically, we ask you to check whether you can check the history of the same phenomenon as the sample or the improvement of the phenomenon.
thanks,
TS
  • 0
    Genius 4800 points
    Hello TI,

    is there anyone have similar experience to me?

    thanks,
    TS
  • 0 in reply to TS Yang
    TI__Mastermind 23675 points
    Hi TS,

    I am looking into this.

    Thank you,
    Ross
  • 0 in reply to Ross Pimentel
    TI__Mastermind 18425 points

    Hi TS,

    We are looking at the history of the device to see if similar observation was recorded before. DP83849 has been successfully implemented in a lot of projects so we will need some time to check if this anomaly was observed before.

    I would like to clarify one thing, you mentioned that DP83849 has been in use for 10 years in the PLC model. Do you mean that the device which shows the anomaly is 10 year old? Or do you mean the PLC board design is 10 years old but the IC was purchased recently? Would it be possible to share the schematics for the board? If sharing on E2E is not possible, then sharing via email is ok.



    -Regards,
    Aniruddha

  • 0 in reply to Aniruddha Khadye
    Genius 4800 points

    Hi Aniruddha,

    thanks for your reply, and I understand that you need more time to check detail history.

    And I'm sorry for confusing you with ambiguous expressions.

    The DP83849ID has been a problem-free device for 10 years in the PLC application, and has recently had 12 bad samples (in production since the end of 2016).

    Of course, the volume we have recently produced has only recently been supplied by TI.
    It is not a situation that occurred in a single production, but it occurred irregularly in three productions.
    I have received confirmation from the TI CQE team that there is no problem with ic alone, and I also request the following from TI:
    - Request to confirm whether there is a way to confirm that E.Phy (DP8389IDVS / NOPB) is functioning normally, not only externally / electrically.
    - Check with the TI Reference design to see if the same phenomenon as the relevant sample can be confirmed for the history or phenomena found.
    thanks,
    TS
  • 0 in reply to TS Yang
    TI__Mastermind 18425 points
    Hello TS,

    I appreciate your patience while we are investigating this. Would it be possible for you to share schematics with us? We can conduct the review over email in case you do not want to post your schematics on E2E.
    Another way to verify device functionality is to monitor the internal registers. Can you provide the register values when you are observing long link up time? Please check register 0x00, 0x01, 0x04, 0x05, 0x10, and 0x19.

    -Regards,
    Aniruddha
  • 0 in reply to Aniruddha Khadye
    Genius 4800 points

    The problem of sharing a schematic requires internal approval, so I'll check it out and answer it.

    And about the register values, please refer to below attached picture.

    1. unlinked status

    2. good link

    thanks,

    TS