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DS90UB954-Q1: CSI-2 Output bandwidth

Shuji Ishiwata
Mastermind 7815 points
Part Number: DS90UB954-Q1

Hi, team,

Please advise on my questions bellows:

Q1.
Are there any equations which show the effective CSI-2 Output bandwidth of DS90UB954?
I can find equations for the effective bandwidth on DS90UB960 data sheet, however,
I cannot find any equations on DS90UB954 data sheet.
The same equations can be utilized.

Q2.
When I tested DS90UB954 under the exact same conditions as DS90UB960,
DS90UB954 reported BUFFERR ERROR while DS90UB960 didn’t report any error,
despite of setting in single DSI-2 port mode.
Are there any differences on design beside the number of CSI-2 ports,
such as size of buffer memory etc.


Best Regards,
Ishiwata

  • 0
    TI__Mastermind 26410 points

    Hello,

    Thank you for your questions. What serializer and mode are you using in your setup? The method/formula for aggregating CSI data is the same for both devices however these devices do support different CSI output speeds, which can impact the aggregation bandwidth. Could you provide some more details about your set-up, how many serializers are being used, the resolution and blanking of the video data, etc.

    Regards,
    Darrah

  • 0 in reply to Darrah Merillat
    Mastermind 7815 points

    Hi Darrah,

    Thank you for your support.
    A customer contacted us and informed us that the DS90UB954 was not working due to incorrect settings. It seems to be working properly now.

    I have an additional question.
    There is no formula for calculating BW in the DS90UB954 data sheet.
    The BW calculation below is listed in the DS90UB960 data sheet, but can it be used similarly for the DS90UB954?

    Best Regards,
    Ishiwata

  • 0 in reply to Shuji Ishiwata
    TI__Mastermind 26410 points

    Hello,

    Glad that the device issue has been resolved. To answer your question, yes the same formulas can be used for the DS90UB954. The CSI aggregation method and corresponding CSI bandwidth is not device specific. For some more background on CSI aggregation you can review this video.