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DS250DF230: connection for the bidirectional use case

Yusuke Mukuno
Expert 7395 points
Part Number: DS250DF230

Hi

Could you please let me know the method of connection for the bidirectional use case.

it is descripted in the datasheet as below,

Why do you recommend the connected Rx1 to Tx0 and Rx0 to Tx1?

(Datasheet)

ASIC -> RX1(Retimer) -> TX0(Retimer) -> TD(SFP32)
ASIC <- TX1(Retimer) <- RX0(Retimer) <- RD(SFP32)

Can they use the following connection?

ASIC -> RX1(Retimer) -> TX1(Retimer) -> TD(SFP32)
ASIC <- TX0(Retimer) <- RX0(Retimer) <- RD(SFP32)

Thanks

Muk 

  • 0
    TI__Mastermind 19235 points

    The DS250DF230 retimer is by definition a two-channel unidirectional device, where the Rx input pins are on one side of the device package and the Tx outputs are on the opposite side of the device package. The application configuration per Figure 16 of DS250DF230 datasheet is meant to facilitate the use of the retimer in a bidirectional application, by allowing one Tx-Rx pair to face the ASIC side and the other TX-RX pair face the SFP28 side. Technically they can use direct RX1 to TX1 mapping, but that may make the layout a little trickier.

    Cordially,

    Rodrigo Natal

    HSSC Applications Engineer

  • 0 in reply to Rodrigo Natal
    Prodigy 50 points

    Hi Natal-san,

    Thanks for the polite answer.
    I understood that it was the convenience of pattern wiring.

    Thanks

    Otani