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DS90UB954-Q1EVM: Issues Displaying Video

slshoesm
Prodigy 20 points
Part Number: DS90UB954-Q1EVM
Other Parts Discussed in Thread: DS90UB953-Q1EVM, , ALP

We are having a problem displaying video data. To date we have only been able to display a green screen or a mixture of dark screens if we play with the test pattern registers. We seem to have a lock and valid MIPI input from the video decoder. We can display the registers remotely between the DS90UB954-Q1EVM and DS90UB953-Q1EVM wehn connected to ALP. 

The system is a video decoder (ISL79987) -> serializer (DS0UB953-Q1EVM) -> de-serializer (DS0UB954-Q1EVM) -> ISP (i.mx6 solo EVK).

When the video decoder is interfaced to ISP directly we have no issue displaying video. We think the problem is either the SERDES initialization or the output format to the ISP. This is our first time dealing with FPD-Link components and don't know how to effectively troubleshoot them. We seem to have MIPI traffic on both ends of the CSI interfaces.

I don't know if this makes a difference but the output of the video decoder is 720x480 @ 30fps with a YUV422 color encoding. Thanks for any help you can provide.

  • 0
    TI__Expert 3055 points

    Hello,

    When you used the pattern generator, did you enable it on the 953 or the 954? Do you see this issue when the pattern generator is enabled on the 954?

    Can you please provide a register dump of the both the serializer and the deserializer? You can do this through ALP by using the Save button on the right hand side of the register tab. You may need to change the file extension to .txt to upload it to e2e.

    Regards,

    Zoe