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DS90UB940N-Q1: Input/Output data format and connected with 941 questions

Zirui Su
Expert 5340 points
Part Number: DS90UB940N-Q1

Hi team 

I have 2 main questions to ask about the data format:

1a. Does the table mean that we could configure IFMT about what format type of input depend on the coming video stream, and we could adjust it to the display screen interface by configuring OFMT?

1b. In IFMT it said 940N supporting YUV422,YUV444, does it mean 940N support all type of bits in YUV422 and YUV444 like YUV422-12bit, YUV444-8bit?

1c. In figure 2, I could only see the YUV420 while do not see the YUV444 and YUV422, does it mean all input types of YUV422 and YUV444 940N could support? Does 940N support data format conversion and what type of conversion could 940N support?

Figure 1. 

Figure 2.

2. When 941 connects to 940N:

I see 941AS support such input data type below:

And I think it is a little bit different with 940:

So I would like to ask that if 941AS input is YUV422 16-bit, 20-bit, 24-bit format (or YCbCr format), could 940N also support them? Or in another way, any types of 941AS input could also be supported by 940N?

Thanks very much for such detailed questions reply in advance, thank you.

  • 0
    TI__Mastermind 25765 points

    Hello,

    To answer your questions in order:

    • Yes
    • The 940N supports input video data formats per HDMI spec 1.4. The YUV formats included are:
      • YUV444: Each pixel clock has 8 bits for Y, U(Cb) and V(Cr) components
      • YUV422: Each pixel clock has 12 bits for Y and 12 bits for U(Cb) or V(Cr), where U and V alternates for every pixel
    • Similarly to above, the YUV output formats supported are:
      • YUV422 8-bit
      • YUV420 8-bit
      • YUV420 legacy
    • The 940N supports data conversion, however color space conversion is only available from RGB to YUV.
    • There are always 24 bits per pixel in the 940N inputs, so since the 941AS video formats always have 3 bytes per pixel (as mentioned in the last image you attached), this is likely supported so long as input requirements on the 940N are met.

    Regards,

    Ben

  • 0 in reply to Ben Dattilo
    TI__Expert 5340 points

    Hi Ben,

    You mean 940N support data conversion, do you mean it supports YUV 444 8bit convert to like YUV422 8bit / YUV420 8bit / YUV420 legacy? 

  • 0 in reply to Zirui Su
    TI__Mastermind 25765 points

    Hi,

    Data conversion is only supported if the input is RGB, where it can be converted to different widths or to YUV. A YUV input will be transmitted as one of the 8-bit YUV formats on the CSI output.

    Regards,

    Ben