Datasheet 259
Functional Description
5.26.2.3 Digital Video Interface (DVI)
The PCH Digital Ports can be configured to drive DVI-D. DVI uses TMDS for transmitting
data from the transmitter to the receiver which is similar to the HDMI protocol but the
audio and CEC. Refer to the HDMI section for more information on the signals and data
transmission. To drive DVI-I through the back panel the VGA DDC signals is connected
along with the digital data and clock signals from one of the Digital Ports. When a sys-
tem has support for a DVI-I port, then either VGA or the DVI-D through a single DVI-I
connector can be driven but not both simultaneously.
The digital display data signals driven natively through the PCH are AC coupled and
needs level shifting to convert the AC coupled signals to the HDMI compliant digital sig-
nals.
5.26.2.4 Display Port*
DisplayPort is a digital communication interface that utilizes differential signaling to
achieve a high bandwidth bus interface designed to support connections between PCs
and monitors, projectors, and TV displays. DisplayPort is also suitable for display
connections between consumer electronics devices such as high definition optical disc
players, set top boxes, and TV displays.
A DisplayPort consists of a Main Link, Auxiliary channel, and a Hot Plug Detect signal.
The Main Link is a uni-directional, high-bandwidth, and low latency channel used for
transport of isochronous data streams such as uncompressed video and audio. The
Auxiliary Channel (AUX CH) is a half-duplex bidirectional channel used for link manage-
ment and device control. The Hot Plug Detect (HPD) signal serves as an interrupt
request for the sink device.
PCH is designed as per VESA DisplayPort Standard Version 1.1a. The PCH supports
VESA DisplayPort* PHY Compliance Test Specification 1.1 and VESA DisplayPort* Link
Layer Compliance Test Specification 1.1.
Figure 5-17. DP Overview
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