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DS90UR910-Q1: LOCK and PASS status in fault state

Dominik S
Prodigy 30 points
Part Number: DS90UR910-Q1
Other Parts Discussed in Thread: DS90UR241

I am currently analyzing a fault condition with the following behavior:

First the deserializer works as expected. The transmitted camera image is shown correctly. Deserializers LOCK and PASS outputs are HIGH.

An event/condition, which we do not yet know, causes that we just get a white screen instead of the camera image.
In this condition we still measure 3.3V (#1) at the outputs LOCK and PASS. Even if we then physically disconnect the FPD-Link Signal, we still measure 3.3V (#1) at LOCK and PASS.

#1: due to pull-ups in our application, LOCK and PASS remains HIGH or go to TRI-STATE.

So is there a typical reason that causes this kind of behavior?

application details:
Camera data is serialized via DS90UR241. A DS90UR910 in backward compatible mode deserializes the stream.

  • 0
    TI__Guru** 103215 points

    Hello Dominik,

    White screen in this kind of topology is coming from the Micro-processor, not the 910. Usually this kind of phenomenon will come as a result of a CSI-2 error that occurred between the 910 and the Micro processor, which in turn causes the Micro-processor to fail in the video conversion pipeline and start outputting a white screen. Can you check if the microprocessor can report any information about the CSI-2 interface health such as any physical layer or protocol errors that are occurring? Also let's make sure that the 910 CSI-2 timing parameters are set up correctly based on the operating conditions. Can you provide the following details regarding your implementation?

    - Init code for UR910

    - Horizontal active pixels 

    - Vertical active pixels 

    - Horizontal blanking pixels 

    - Vertical blanking lines

    - Frames per second 

    - PCLK in MHz 

    Best Regards,

    Casey