Main link video should not be enabled until a proper video source has
been provided to the source core. Typically the source device wants to read the EDID
from the attached sink device to determine its capabilities, most importantly its
preferred resolution (and other supported resolutions if the preferred mode is not be
available). When a resolution has been determined, set the Main Stream Attributes in the
source core (0x180 to 0x1B0). Enable the main stream (0x084)
only when a reliable video source is available.
Important: When the main
link video is enabled, the scrambler/de-scrambler must be reset every 512th BS Symbol as
described in section 2.2.1.1 of the DisplayPort standard. For simulation purposes, you
should force a scrambler reset by writing a 1 to
0x0C0
before the main link is enabled to reduce the amount of time after startup needed to
align the scrambler/de-scrambler.