DS90UB948-Q1: Maximum resolution and blanking

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

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