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DP83848-EPの場合:Can break_link_timer be set from the outside?

?? ??
Prodigy 60 points
Part Number: DP83848-EP

Tool/software:

Hello
I am developing a product that uses the DP83848-EP.
I would like to know more about this IC.
How do you set the break_link_timer for this IC from the outside?
Also, if LAN communication is interrupted, how long does it take to resume, including the break_link_timer?
(in rough terms, how long does it take to resume?)
I am thinking of shortening the break_link_timer to shorten the time until communication is interrupted.
Are there any problems with this?

Regards,
tsuji

  • 0
    TI__Mastermind 24998 points

    Hi Tsuji,

    This break_link_timer cannot be adjusted, it is fixed at ~1500ms.

    Regarding LAN communication link up time after interrupt, this will depend on the application.

    Generally, I expect auto-negotiation process to complete for link up in <1s.

    This can be confirmed experimentally:

    1) Poll link status register repeatedly with timestamps

    2) Connect Ethernet cable

    3) Note time difference from inserting cable to link status polling high

    Thank you,

    Evan

  • 0 in reply to Evan Mayhew
    Prodigy 60 points

    Dear Evan

    Thank you for your reply.

    I have an additional question.

    If there is a way to reduce the time from link down to link up, please let me know.In our system, LAN communication (100base-TX) may stop for about 2 seconds. (We are currently analysing the cause of this.)
    If possible, we would like to reduce the time from link down to link up to less than 1 second.
    As one idea for doing this, we are considering turning off the auto-negotiation function.
    If you have any other good ideas, we would like to receive your advice.

    Best regards,
    Tsuji

  • +1 in reply to ?? ??
    TI__Mastermind 24998 points

    Hi Tsuji,

    Turning off auto-negotiation and forcing speed between link partners is the recommended way to reduce link-up time.

    Please share any findings regarding the LAN communication stopping in your system so I can review and share suggestions.

    Thank you,

    Evan