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SN65DPHY440SS: MIPI retimer SN65DPHY440SS over long flex cable

Feng bin Su
Genius 9030 points
Part Number: SN65DPHY440SS


Hi team,

My customer is asking placement recommendation for SN65DPHY440SS.

From the placement diagram, it seems the output trace is only 1-inch.  Is this 1-inch is a design limitation?

 

If the form factor design make the distance of MIPI camera up to 60cm (~24-inch), do you recommend connect 2 retimers in series to extend the MIPI CSI trace?

 

  • 0
    TI__Guru**** 182491 points

    Hi,

    The DPHY440 supports up to 5dB at 750MHz and 2.5dB DE on its TX. These features were intended to some extent to compensate the ISI loss in the channel. It’s hard to tell a max transmission distance, with different transmission materials may have different results, also the clock rate, source signal swing, DE level of source signal, EQ capability of end point receiver will take an effect. If customer can measure or simulate the degraded eye diagram, they should be able to get an idea of whether they need ISI compensation from DPHY440. 

    As a repeater, DPHY400 is also intended to eliminate the timing skew due to channel differences. As long as the input timing within DPHY440’s spec requirement, it is able to re-align clock and data to improve the system’s timing margin.

    As to repeater on the Rx or Tx it is really a system choice. If one would like to take use of DPHY440’s RX EQ capability for ISI compensation he may want DPHY440 close to TX. So the 1in placement is to maximum the RX EQ as much as possible.

    Thanks

    David