To determine the necessary pixel interface to support a specific resolution, it is important to know the active resolution and blanking information.
For example, to support an active resolution of 2560 × 1600 @ 60, there are two possible blanking formats: Normal Blanking and Reduced Blanking, as defined by the VESA standard.
2560 × 1600 @ 60 + Blanking = 3504 × 1658 @ 60 requires a pixel clock of 348.58 MHz
2560 × 1600 @ 60 + Reduced Blanking = 2720 × 1646 @ 60 requires a Pixel clock of 268.63 MHz
Assuming a pixel clock of 150 MHz and a dual pixel interface:
2560 × 1600 @ 60 + Blanking = 3504 × 1658 @ 60 = 348.58 MHz
348.58 MHz / 2 = 172.28 MHz
2560 × 1600 @ 60 + Reduced Blanking = 2720 × 1646 @ 60 = 268.63 MHz
268.63 MHz / 2 = 134.31 MHz
With a dual pixel interface, the DisplayPort 1.4 TX Subsystem IP can support 2560 × 1600 only if there is a Reduced Blanking input. If full Blanking support is needed, then a four pixel interface should be used.
The following figures show timing diagrams for the three pixel interface options.
