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  • TI Thinks Resolved

Buffer for RGMII

Intellectual 2540 points

Replies: 5

Views: 97

Hi Expert,

Do we have buffer for RGMII supporting >125Mhz? Customer try to improve Tfall within 750ps cause it failed. 

Measured Tf=844 ps

  

Thanks,

Allan

  • Hi Allan,

    See the following FAQ: https://e2e.ti.com/support/logic/f/151/t/740319

    Thanks!

    Chad Crosby

  • In reply to Chad Crosby:

    Hi Chad,

    Customer is concerning fall time not the signal level. Can level shift improve the fall time issue?

    Regards,

    Allan

  • In reply to Allan Fan:

    It would be possible to use a level shifter as buffer, but you could just as well use a plain buffer.

    For supply voltages up to 2.5 V, the AUC family would have the fastest output drivers. For 3.3 V, the fastest family is LVC. Which buffers or transceiver to use depends on the number of channels in each direction.

  • In reply to Allan Fan:

    Hi Allan,

    To follow up to Clemens's post, He's correct: The fastest buffers we offer for 3.3V is the LVC family; however, these devices may not be fast enough to support RGMII speeds. The reason I suggested the above FAQ is that we offer a level shifter that is rated to support RGMII, that could be used as a buffer if both supplies are the same voltage.

    If you have any questions, please let me know.

    Thanks!

    Chad Crosby

  • In reply to Chad Crosby:

    Hi Chad, Clemens,

    Thanks for the feedback. We proposed SN74AXC8T245 and will let you know if further questions. 

    Regards,

    Allan

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