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DS90UB948-Q1: Maximum resolution and blanking

George Pawlowski
Prodigy 110 points

Part Number: DS90UB948-Q1
Other Parts Discussed in Thread: DS90UB949-Q1,

Can the DS90UB949-Q1 and DS90UB948-Q1 support a 2304x1152 resolution at a pixel clock rate of 170MHz?  Are there any horizontal and vertical blanking requirements for these devices?

Thanks,

George

  • 0
    TI__Expert 4555 points

    Hi George,

    What is the refresh rate that you are aiming for on your display? Typically this is 60fps for IVI applications. The DS90UB948/949 can accept a maximum pixel clock rate of 170MHz. The display manufacturer should give the horizontal and vertical blanking intervals, as they are unique for each display, but are typically 25-35% horizontal blanking and 2-5% vertical blanking.

    You can use this equation to see if your system requirements would be able to meet the limit of a 170MHz PCLK:

    PCLK = Htotal x Vtotal x Refresh Rate

    Htotal = Active number of Horizontal Pixels + Overhead

    Vtotal = Active number of Vertical Pixels + Overhead

    If we were to assume you are aiming for a 60fps refresh rate, and minimum blanking -- 25% horizontal and 2% vertical:

    PCLK = (2304  x 1.25) x (1152 x 1.02) x 60fps =  203.05 MHz

    In this case if you were aiming for the specs calculated above, the DS90UB948/949 would not be able to support this display. However, the blanking requirements could be better or worse than my example calculation above, and you can always compensate this by having just a slight downgrade in the refresh rate.

    Regards,

    Jonny

    Training on FPD-Link Serializer Deserializer devices and system: https://training.ti.com/fpd-link-learning-center

    More information on IVI or ADAS FPD-Link products: http://www.ti.com/interface/fpd-link-serdes/overview.html

  • 0 in reply to Jonathan Nguyen
    TI__Prodigy 110 points

    Thanks for the replay. When I ask if the DS90UB948/949 can support 2304x1152 at 170MHz I am assuming reduced blanking at 60Hz. I want to confirm that these devices can handle:

    - an image this size of 2304 x 1152
    - vertical blanking as low as 14 lines
    - horizontal blanking as low as 64 pixels


    Thanks,

    George

  • 0 in reply to George Pawlowski
    TI__Expert 4555 points
    George,

    I believe that it should be able to handle those requirements.

    Regards,
    Jonny