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Display Data Channel (DDC)
The VESA standard Display Data Channel, shown
in Figure 10, is part of the DVI specification. It is
an I
2
C bus used for data communications between
the two devices. The data can include information
specifying the type of display device connected and
can also be used to support copy protection.
Figure 10: Single-Link TMDS
Extended Display Identification Data (EDID)
EDID is the VESA standard protocol used over the
DDC so the display device can communicate identi-
fication about itself to the host device. The data,
stored in memory in the display device, can include
its resolution, sync timing and refresh rates, etc. It
is part of the plug and play package.
Figure 11: HDCP