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SN65DSI84: MIPI signal transmission with SN65DSI84 and DS90UB905 to LVDS panel...

Peter Tseng
Genius 5770 points
Part Number: SN65DSI84

Dears,

My customer wants to use SD65DSI84 to convert MIPI to LVDS and connect with DS90UB905 to the LVDS panel which is DS90UB906 inside.

However, he failed and there is no any display on panel.

While use SN65DSI84 patten as signal source, they can see the patten on panel. It means the trace is OK from SN65DSI84 output to panel.

Another test is using MIPI to RGB888 IC to provide RGB888 signal from same MIPI signal then connect to DS90UB907 and panel, there is no problem with such connection.

My question is, why SN65DSI84 cannot convert same MIPI source to LVDS then pass to panel through DS90UB905?

Does such connection workable or not?

Thanks.

  • 0
    TI__Mastermind 18655 points

    Hello Peter, 

    Frist of all, make sure that the customer has the MIPI inputs driven to LP11(both P and N pairs of all MIPI DSI differential pairs to single ended high ~1.2V) prior to asserting EN pin.

    Also, verify that timing configuration provided by the DSI video source (APU) is also correct per the recommendation generated by the  DSI Tuner tool (Output Tab).The DSI8x does not realign timing. The line time (horizontal sync to the next horizontal sync timing from the APU) on the input is preserved when output onto the LVDS interface.  If the line time is different from what is calculated by the tool, this will cause issues.  Even if the DSI source is outputting streams in burst manner, it is important for the DSI source to fill in the rest of the line time with blanking packets(or LP11) to meet the line time requirement.

    Regards