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DS90UB926Q-Q1: how to configure RGB666

Amelie Zheng
Genius 10865 points
Part Number: DS90UB926Q-Q1


Hi Team,

The cpu my customer used now is only support for output RGB666.

However 926 support RGB888, so customer now only use RGB888[2:7] and found that the display is not very clear. 

May I ask how to fix 926 to pair with RGB666 data source?

Which register need to setup and is it possible to fix it by Hi-FRC?

Thanks!

  • 0
    TI__Expert 7280 points

    Hi Amelie,

    You can set up the 926 in 18bit mode through the mode_sel pin, see datasheet extract below.

    You can also override this startup configuration through the registers.

    Do you know what serializer is used on the other side of the link ?

    Best regards,

    PA

  • 0 in reply to Pial
    TI__Genius 10865 points

    hi Pial,

    Thanks for your reply. 

    I think my description has something wrong.

    The signal is RGB888(CPU output)→925→926→RGB666(Another MCU).

    Since the video source of CPU is RGB888 but 926 need to output RGB666 to another MCU, 926 input RGB888 but output RGB666,is it possible to achieve?

  • 0 in reply to Amelie Zheng
    TI__Expert 7280 points

    Hi Amelie,

    To do that, I believe your customer was using the right technique, connecting the 6 MSb of each R/G/B signals.

    What do mean when you write: "the display is not very clear" ?

    Best regards,

    Pial

  • 0 in reply to Pial
    TI__Guru** 103215 points

    Hello Amelie,

    Not sure why you have two threads open for the same question: https://e2e.ti.com/support/interface/f/138/t/886129

    From the other thread what you want to use is Adpative HI-FRC Dithering described in 8.3.15. See table 4 in the 926 datasheet for your use case where you are receiving 24 bit RGB888 from the 925 and you want to down-convert to RGB666 (18bit) while smoothing the gradients.

    Best Regards,

    Casey