Description
DisplayPort TX IP version 2.1.0 requires
the video input to provide blanking interval between active horizontal video
lines to ensure correct video data packing.
Failure symptoms include no video
image output or black screen, even though link training completes
successfully on the connected sink device.
In most cases where the input originates
from a proper video source, the timing between lines is already handled
correctly. However, issues may arise when an image processing block (ie video
scaler) is inserted between the video source and the DisplayPort TX IP, as such
devices may alter or disrupt the blanking intervals in the video stream.
Resolution
Users must ensure that the video input to
the DisplayPort TX IP includes blanking interval between active lines.
Back-to-back video input without blanking
interval will be supported in the next DisplayPort IP release,