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SN75DPHY440SS: DSI application example

Gim Song
Intellectual 1120 points
Part Number: SN75DPHY440SS

Hi, 

 

We are looking at SN75DPHY440SS to use as Redriver/Retimer IC from Apollolake DSI (MIPI) to external LCD. May I know if you have any application note for DSI application instead of CSI (as shown in the datasheet)? Please share with me the DSI connection with this IC.

 

Thanks.

 

Best regards,

Gim Song

  • 0
    TI__Guru 64326 points
    Gim,

    We do not have any application note for DSI application specifically however DSI and CSI-2 are electrically the same. Major differences come in on the protocol level. Please see the SN75DPHY440SS EVM (www.ti.com/.../dphy440ssrhrevm) for DSI connection, this EVM support both DSI and CSI-2.

    It’s hard to tell a max cable 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.The DPHY440 supports up to 4dB EQ on its Rx and 2.5dB DE on its TX. These features were intended to some extent to compensate the ISI loss in the channel. If measurement or simulation of the degraded eye diagram can be done, they should be able to get an idea of whether they need ISI compensation from DPHY440.
  • 0 in reply to Malik Barton57
    TI__Intellectual 1120 points

    Hi Barton,

    Does DE means pre-emphasis level on TX?

    We would like to know the max input cable length that this part can support. The current length is 25 inches where 5 inches on PCB (between MIPI DSI to cable) and 20 inches cable. Max datarate is 500Mbps. This part will be placed at the end of cable.

    Below is the clock signal where you can check the eye height/diagram at the end of cable,

    Thanks.

  • 0 in reply to Gim Song
    TI__Guru 64326 points

    Gim,

    Yes in my post DE does mean pre-emphasis.

    25 inches of PCB trace and cable should be able to work with a max data rate of 500 Mbps.

    For clarification:

    Is your eye diagram taken with the SN75DPHY440SS in the data path and enabled? What is the time scale, seconds per division, for this figure? 

  • 0 in reply to Malik Barton57
    TI__Intellectual 1120 points
    Hi Barton,

    The eye diagram plot is taken without SN75DPHY440SS. We are planning to use it to improve the distance.

    Thanks.