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

Craig Mahaney

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

over 4 years ago

0 Casey McCrea over 4 years ago

TI__Guru* 98475 points

Hello Craig,

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

Best Regards,

Casey

0 Casey McCrea over 4 years ago in reply to Casey McCrea

TI__Guru* 98475 points

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

0 Bryan Kahler over 4 years ago in reply to Casey McCrea

TI__Mastermind 25955 points

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

0 Bryan Kahler over 4 years ago in reply to Bryan Kahler

TI__Mastermind 25955 points

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

0 Craig Mahaney over 4 years ago in reply to Bryan Kahler

Prodigy 20 points

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.

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