• Resolved

DS90UB940-Q1: MIPI short packets and CSI Virtual Channel identifier

Prodigy 20 points

Replies: 5

Views: 150

Part Number: DS90UB940-Q1

Greetings,

Does the DS90UB940 send the MIPI short packets (e.g. frame start, frame end) on the same virtual channel as programmed in CSI_VC_ID, or are they fixed to MIPI virtual channel 0? I have a case where image capture only seems to receive the synchronization information when using virtual channel 0. Thank you.

Best Regards,

Craig

  • Hello Craig,

    We will check into this early next week and respond back to see if we see the same issue. 

    Best Regards,

    Casey 

  • In reply to Casey McCrea:

    Hello Craig,

    Sorry for the delay - we are still looking into this issue and will work to get a response ASAP. Are you still seeing the same behavior?

    Best Regards,
    Casey 

  • In reply to Casey McCrea:

    Hi Craig,

    This just hit my desk.  I've looked into this with both the design and systems teams - this feature should be working.  Please let me know the configuration of your set up so I can reproduce it in the lab.

    In addition to your set up details, please let me know the following information:

    - Which Ser/Des combination?

    - How are you programming the 940? (via local i2c or BCC)

    Sincerely,
    Bryan Kahler

  • In reply to Bryan Kahler:

    Hi Craig,

    Haven't heard back from you in a few days - hopefully no news is good news and the issue is now resolved.  If not, to help replicate the issue in the lab, please provide the following:

    Which serializer do you have paired with the 940 in your test setup?

    Sincerely,
    Bryan Kahler

  • In reply to Bryan Kahler:

    Thank you for the responses. We have since been able to determine that the MIPI short packets are indeed sent on the same virtual channel as programmed in CSI_VC_ID.