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  • TI Thinks Resolved

TLK110: Link pulse was returned under power off state

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Replies: 6

Views: 183

Part Number: TLK110

Dear all,

The same phenomenon as the following E2E link is occurring in our customers.

Along with that, I have been asked by them the conditions to link up when TLK110 is OFF.

If TLK110 is OFF and your link partner is under the following conditions, please let me know if you want to link up.

・When the communicating partner device (link partner) is used at a forced 10Mbps

・When the communicating partner device (link partner) is used at a forced 100Mbps

・ When  is judged as 10Mbps by ANEG (auto negotiation)

・ When it is judged as 100Mbps by ANEG (auto negotiation)

I hope you can get a reply as soon as possible.

Best Regards,

Y.Ottey

  • Hi Ottey,

    To prevent the phenomena from occurring we recommend using a CMC along with the transformer.

    The phenomena can occur when the link partner is either sending FLP in auto-negotiation or sending link pulses when forced to 10Mbps mode.

    Best regards,

    Ross Pimentel

    Ethernet - Applications Engineer

  • In reply to Ross Pimentel:

    Dear Ross

    Thank you for your reply.

    I encouraged our customers to use a CMC with a transformer, but our customers are not able to add a transformer or CMC because the design is over.
    Therefore, they are wondering if they can cope with 10Mbps to 100Mbps.

    I would like to ask additional questions about the above two questions that you answered.
    1. When TLK110 is OFF and link partner is used with ANEG, it is considered that the idle signal cannot be received even if FLP is transmitted, so downshift to 10M.
    Is this perception correct?

    2. When using link partner with force 100M, is it okay to recognize that the link is not up?

    I hope you get a reply as soon as possible

    Regards,

    Y.Ottey

  • In reply to Y.Ottey:

    Dear all,

    I hope you can get a reply as soon as possible.

    I have received a request from our customers to get a quick response.

    Best Regards,

    Y.Ottey

  • In reply to Y.Ottey:

    Hi,

    A1) If there is no link detected, the link partner will send FLPs if auto-negotiation is detected. FLPs are very similar to NLPs when link is established in 10Mbps mode.

    A2) If they force the link partner to 100Mbps, regardless of link the link partner will send MLT3 signaling. This will not cause any issue with the TLK110 and both PHYs will still be able to detect when there is a proper link or not.

    Best regards,

    Ross Pimentel

    Ethernet - Applications Engineer

  • In reply to Ross Pimentel:

    Dear Ross

    Thank you for your reply.

    "A2) If they force the link partner to 100Mbps, regardless of link the link partner will send MLT3 signaling. This will not cause any issue with the TLK110 and both PHYs will still be able to detect when there is a proper link or not."

    As mentioned above, is it OK to recognize that link up will not occur if TLK110 is OFF?

    Regards,

    Y.Ottey

  • In reply to Y.Ottey:

    We have not seen a link partner detect link when the link partner is forced to 100Mbps and the TLK110 is off.

    Best regards,

    Ross Pimentel

    Ethernet - Applications Engineer

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