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DS90UB934-Q1: 2MP/30fps support format ?

Toshi
Expert 1780 points
Part Number: DS90UB934-Q1

Hi TI,

I'd like to confirm the image format of  "2MP/30fps support" of the device.

What image format is supposed  ?  

For example, my calculation,

the PCLK of 2MP/30fps is 60MHz.

If use YUV422 format, It need x2 frequency, so the PLCK should be 120MHz for the  Serdes PCLK.

But the device spec is 100MHz(MAX).  

Please let me know how to support 2MP/30fps by this device ?

  • 0
    TI__Genius 12866 points
    Hi,
    934 could support RAW10 RAW12 and any 10 bits or 12 bits format as long as host processor accepts them.
    In the case of YUV, 12 bit mode could be utilized. 2MP/30fps = 60MHz. In 12HF mode, it needs 1.5x frequency so only 90MHz PCLK will be needed. This setup will depends on YUV bit format and your target data throughput.

    Sincerely,
    Charley Cai
  • 0 in reply to Charley Cai
    Expert 1780 points

    Charley, thank you for your reply. 

    I'm sorry but I'd like to know the 12HF mode.

    I could not find the YVU 12HF mode in the web, Could you please explain it ?  

  • 0 in reply to Toshi
    TI__Genius 12866 points

    Hi,

    Sorry I didn't make it clear enough. 

    The 12HF mode is a mode for DS90UB934. The line rate could  be calculated as 

    Sincerely,

    Charley Cai 

  • 0 in reply to Charley Cai
    Expert 1780 points

    Charley, thaks.

    I see, the 12HF is operation mode of 933/934.

    Well, you said that  " ....it needs 1.5x frequency....." .

    I guess it means that  the device can support a 2MP/30fps  YUV422(16bit/pixcel), correct ?

    The line rate is within the device spec but my concern is who make the 1.5X frequency ?  

     16bit X 60MHz    =>  12bit X 90MHz(1.5 PCLK) 

     

    Or the device support up to 2MP/30fps(12bit/pixcel) format ?

    {for example :  YUV411(12bit/pixcel)}

    I'm sorry I could not understand the  PCLK and video format .

  • 0 in reply to Toshi
    TI__Genius 12866 points
    Hi,
    In 12bit HFmode, the Serializer will internally divided the PCLK by 1.5. The Deserializer will multiply the recovered clock by 1.5.

    The device can simply support YUV411(12bit/pixcel), but not YUV422(16bit/pixcel). Because the 934 device only takes 10 bit or 12 bit data format.

    It is possible to use YUV422(16bit/pixcel) format, but the image sensor has to construct the 16bits format into multiply 12bits format and the image processor has to deconstruct the 12bits format back to 16bits when the data passed through Serializer and Deserializer pair. The SerDes pair will take the 12bits data as is and pass it through.


    Sincerely,
    Charley Cai