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DP83849 DUAL vs 2 TLK110's in an EtherCat design

Bryan Busacco
Expert 1215 points
Other Parts Discussed in Thread: TLK110, AM3359, DP83849IF, TLK106

I am looking at the AM3359 for an Ethercat application. The Industrial Communications eval board uses two TLK110's on it.  The TLK110PT offers "RT" ( RealTime )  Deterministic, Low Latency, Low Jitter ) performance.

It looks like the DP83849IF offers the same "RT" features, however when I look at the datasheets for the two devices, I see slightly different wording that makes me wonder if the DP83849 is suited for EtherCat Industrial COmmunications. My assumption, also, is that the DP83849 was not a released product when the AM3359 board was designed?? -or- perhaps, it's just not a good choice to design in.

Does the DP83849 offer the same performance as two TLK110's? Is there a reason NOT to use a DUAL PHY in an EtherCat application?  This could be a nice space saving way to go.

 

Thank you,

 

Bryan Busacco.

  • 0
    TI__Mastermind 31600 points

    Bryan,

    The DP83849 and the TLK110 represent different generations of 10/100 Physical layer devices.  While they share many common features, they do have some differences that may be of interest in some EtherCAT implementations.  Relative to EtherCAT, the TLK110 includes some additional features that may be worthy of consideration, for example, fast link loss and fast RX_DV modes.  If this functionality is important for your design, the TLK110 may be well suited to your needs.  If the space savings of using the dual port device is more important, then the DP83849 could be considered. 

    Patrick

  • 0 in reply to Patrick OFarrell
    TI__Intellectual 1720 points

    Hi Brian,

    Further more, we will release in the following weeks a smaller version of the TLK110 in a 32 QFN package - TLK106.

    Some customers, which has space saving requirements as well, find this package size to be sufficient for their system and in some cases even easier to implement (if the 2 ports for example can be spaced to ease system constraints).

    The TLK110 and TLK106 were drafted in preliminary document by Beckhoff as fully compatible with all Ether-CAT requirements (Fast link drop, RX_ERR in idle, TX_CLK phase shift and more).

    We hope to release in the following weeks a dedicated Aplicaiton note describing the compliancy of the TLK110 /106 with EtherCAT requiremnts.

    Thanks,

    Oren

  • 0 in reply to Oren Shalita
    TI__Expert 3700 points

    Hi, Oren

    Would you please share the document you mentioned?

    The TLK110 and TLK106 were drafted in preliminary document by Beckhoff as fully compatible with all Ether-CAT requirements (Fast link drop, RX_ERR in idle, TX_CLK phase shift and more).

    Could you please also share the Application note to me?

    Thanks!

  • 0 in reply to Harson
    TI__Intellectual 1720 points

    Hi,

    The application note is still not released, however it will be based on the EtherCAT PHY selection guide, describing the compatibility of the TLK110/105/106 PHYs with the EtherCAT PHY implementation guidelines. You can see the TLK devices already described as compatible in this guide.

    The PHY selection guideline can be found in the following link:
    http://www.beckhoff.com/english.asp?download/ethercat_development_products.htm&anker=appnotes

    Look for - 'Application Note PHY Selection Guide'

    Once the TLK EtherCAT compatibility application note will be ready we will publish it on the TLK product page.

    Thanks & Regards,

    Oren

  • 0 in reply to Oren Shalita
    Prodigy 190 points

    It may be useful to check the DP83849 behaviour after startup before applying clock:

    https://e2e.ti.com/support/interface/ethernet/f/903/p/547298/2001665