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FlexRay line driver?

Massimo
Expert 6475 points

Other Parts Discussed in Thread: TMS570LS20216

Hi,

I want to connect 2 tms570LS2xx using FlexRay.

I cannot use a flexray transceiver, for several reasons. Which line driver can I use for the physical connection? An LVTTL buffer, or an optocoupler?

Thanks, best regards
Massimo

  • 0
    TI__Guru**** 199196 points

    Hi Massimo,

    The flexray transceiver is to realize the physical interface between flexray node module and the channel, and provides differential tx and rx capability to the bus. I don't know your application, but the regular line driver won't be fully compliant with the flexray electrical physical layer spec V2.1 revA.

    Regards,

    QJ

  • 0 in reply to QJ Wang
    TI__Expert 6475 points

    Hi Qj,

    thanks for the answer.

    in this case I don't care about being compliant with any physical standard. I just have a point to point connection between 2 tms570ls20216, ChannelA to ChannelA and ChannelB to ChannelB.

    Do I need any line driver in the middle a proper communicatio between the 2 devices?

    Best regards
    Massimo

  • 0 in reply to Massimo
    TI__Expert 6475 points

    Hi,

    do we have an answer to this question please?

    To be more specific:

    In order to  physically connect a  couple of  TMS570LS20216  (device #1  to  another device #2)  via  point to point FlexRay connections as specified below,

      TMS570LS20216 #1 FlexRay:  Port A (Tx) ->  TMS570LS20216 #2 FlexRay:  Port A (Rx)

     TMS570LS20216 #1 FlexRay:  Port A (Rx) <- TMS570LS20216 #2 FlexRay:  Port A (Tx)

    TMS570LS20216 #1 FlexRay:  Port B (Tx) ->  TMS570LS20216 #2 FlexRay:  Port B (Rx)

     TMS570LS20216 #1 FlexRay:  Port B (Rx) <- TMS570LS20216 #2 FlexRay:  Port B (Tx)

    can I use direct RX-TX port connections with simple buffers  thus avoiding usage of a standard Flexray transceiver ?

    Thanks,

    Massimo

  • 0 in reply to Massimo
    TI__Guru**** 199196 points

    Hi Massimo,

    I think it is possible, but we never tested. 

    Regards,

    QJ

  • 0 in reply to QJ Wang
    TI__Mastermind 30845 points

    Hi Massimo,

    I have tried using RS 485 transceivers in the past in a lab environment and had a network running with it.

    As QJ pointed out, surely this does not meet the FlexRay physical layer requirements, but it seemed to work fine for a trial.

    Regards,

    Abhishek