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TMDS171: Input to reversed polarity

Shuji Ishiwata
Mastermind 7805 points
Part Number: TMDS171
Other Parts Discussed in Thread: SN65DP149,

Tool/software:

Hi All,


I have a question about TMDS171 and SN65DP149.

Is it possible to input negative to D2p and positive input to D2n as shown in the figure below?


Since it is a retimer, I believe it cannot accept inputs with reversed polarity. Is my understanding correct?


Best Regards,
Ishiwata

  • 0
    TI__Guru**** 176721 points

    Ishiwata-san

    Both TMDS171 and DP140 can support input polarity swap. Please note polarity swap only works when in retimer mode. When this function is enabled and the device is in automatic cross over mode between redriver and retimer modes, care must be taken to avoid losing polarity swap. When the data rate drops to the redriver level, the polarity swap is lost.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Mastermind 7805 points

    Hi David-san,

    Thank you for your answer.

    Is it okay to swap the polarity of the CLK when in retimer mode?

    Also, is it okay to mix different polarities like the ones below?

    Best Regards,
    Ishiwata

  • +1 in reply to Shuji Ishiwata
    TI__Guru**** 176721 points

    Ishiwata-san

    Polarity swap exchanges the N and P channel polarity in each input lane. But please note the polarity swap is only available to RETIMER mode. The polarity swap function will be lost if TMDS171 and DP149 are switched to REDRIVER mode.

    Thanks

    David