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DS90UR910-Q1: DS90UR910 output signal is abnormal even lock pin and pass pin are in high status

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Replies: 23

Views: 202

Part Number: DS90UR910-Q1

Hi,

We use DS90UR910  as deserializer to convert FPD Link to mipi CSI, and we configure it in Gen 2 mode, but nothing output now, the output signal is abnormal.

The input signal comes from car main unit, which can display on the car monitor without any problem. On the hardware level, lock pin and pass pin work fine, both of them are in high status, so what other things should we configure to make the output signal become normal, maybe some register value need to adjust? Hope to get some help. Thanks

Here is the output signal showed on the oscilloscope.

  • Hello,

    Could you let me know what serializer is used? What is the PCLK of the video?

    When you say the you can display the content on a car monitor, is a different deserializer used? 

  • In reply to Charley Cai:

    Hi, 

    The serializer of car main unit is DS99R421, we already checked data sheet, it can compatible with DS90UR910 in Gen 2 mode. 

    When we test input signal to display the content on car monitor, we use DS90UR124 as deserializer on another device.

    Do you mean the PCLK of input video?

  • In reply to user6391035:

    Yes, i would like to know the PCLK of the input video .

    Best Regards,

    Charley Cai

  • In reply to Charley Cai:

    Hi, 

    The PCLK of the input video is 33MHz. 

    Best Regards

  • In reply to user6391035:

    Hello,

    Could you check if video resolution fall into the look up table listed in the datasheet?

    7.3.5 Display Timing Requirements

  • In reply to Charley Cai:

    Hi, 

    Yes, the datasheet includes the input video resolution 800x480

  • In reply to user6391035:

    Hello,

    Could you help me check if VS, HS, and DE signal is supplied to DS99R421? 

    Could you check if supplied VS and DE are active low or active high?

    Could you please provide a register dump for the UR910?

    Best Regards,

    Charley Cai

  • In reply to Charley Cai:

    Hi, 

    1. Yes, VS, HS, and DE signal is confirmed to supply to DS99R421. 

    2. The VS, HS, and DE are active low.

    3. Here is the register dump for the UR910.

    Best Regards

  • In reply to user6391035:

    Hello,

    The registers look like what you are writing to the 910. 

    Could you read back all the registers from 0x00 to 0x3B after you program the device? 

    Best Regards,

    Charley Cai

  • In reply to Charley Cai:

    Could you also let me know what signal is channel 2? It looks like active high signal. 

    We may need to adjust the polarity if active high / low is flipped. 

    Best Regards,

    Charley Cai