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DP83825I: Repeater Mode / Back-to-Back PHYs

Martin Seeger
Expert 5411 points
Other Parts Discussed in Thread: TLK105, DP83825I

Dear Team,

our customer is looking for a ETH repeater. We found following solutions that are bases on two back-to-back PHYs:

  1. DP83848 & appnote SNLA076A that shows in section 6 the implementation for full Duplex
  2. TLK105* that can also be used in this case (this E2E post was referring to the same appnote SNLA076A)
    * We are aware that this part is NRND - the customer might want to use rest of their inventory.
  3. DP83825I (PREVIEW) whose datasheet describes this use case (page 15 / 8.3.5)

The implementation from (1) and (3) are very similar. (1) uses a clock that is connected to both PHYs, (3) is showing a clock that is connected to the master PHY only.

The question: Does (3) have any differences and advantages over (1) in the use case of the Repeater Mode with Back-To-Back PHYs?

Thanks and best regards
Martin

  • 0
    TI__Mastermind 26320 points
    Hi,

    DP83848 and DP83825I both can be used for extender operation using RMII interface.

    DP83848 will need external 50 MHz Clock from OSC fed to both PHYs as both operates in RMII slave mode.

    With DP83825I, one PHY can be operate in RMII Master and second PHY in RMII Slave. In this combination, your system can be clocked from 25 MHz XTAL as well. Other difference is FF and Power Consumption, DP83825 is 3x3 mm2 and low power PHY.



    Regards,
    Geet
  • 0 in reply to Geet Modi
    TI__Mastermind 26320 points
    Hi,

    I am closing this thread. Incase you have further queries, please open new thread and provide reference to this thread.

    Regards,
    Geet