Specification Sheet

Interfaces
40 Datasheet, Volume 1 of 2
2.5.4 DisplayPort*
The DisplayPort* is a digital communication interface that uses differential signaling to
achieve a high-bandwidth bus interface designed to support connections between PCs
and monitors, projectors, and TV displays.
A DisplayPort* consists of a Main Link, Auxiliary channel, and a Hot-Plug Detect signal.
The Main Link is a unidirectional, 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
management and device control. The Hot-Plug Detect (HPD) signal serves as an
interrupt request for the sink device.
The processor is designed in accordance to VESA* DisplayPort* specification. Refer to
Tab le 2 -1 4.
2.5.5 High-Definition Multimedia Interface (HDMI*)
The High-Definition Multimedia Interface (HDMI*) is provided for transmitting
uncompressed digital audio and video signals from DVD players, set-top boxes, and
other audio-visual sources to television sets, projectors, and other video displays. It
can carry high-quality multi-channel audio data and all standard and high-definition
consumer electronics video formats. The HDMI display interface connecting the
processor and display devices uses transition minimized differential signaling (TMDS) to
carry audiovisual information through the same HDMI cable.
HDMI includes three separate communications channels: TMDS, DDC, and the optional
CEC (consumer electronics control). CEC is not supported on the processor. As shown in
the following figure, the HDMI cable carries four differential pairs that make up the
TMDS data and clock channels. These channels are used to carry video, audio, and
auxiliary data. In addition, HDMI carries a VESA DDC. The DDC is used by an HDMI
Source to determine the capabilities and characteristics of the Sink.
Audio, video, and auxiliary (control/status) data is transmitted across the three TMDS
data channels. The video pixel clock is transmitted on the TMDS clock channel and is
used by the receiver for data recovery on the three data channels. 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 signals.
Figure 2-8. DisplayPort* Overview
SourceDevice SinkDevice
MainLink
(IsochronousStreams)
AUXCH
(Link/DeviceManagemet)
Hot‐PlugDetect
(InterruptRequest)
DisplayPortTx
(Processor)
DisplayPortRx