Hdmi Overview - Intel 6 SERIES CHIPSET - DATASHEET 01-2011 Datasheet

5.26.2.1.4 LVDS DDC
The display pipe selected by the LVDS display port is programmed with the panel timing
parameters that are determined by installed panel specifications or read from an
onboard EDID ROM. The programmed timing values are then 'locked' into the registers
to prevent unwanted corruption of the values. From that point on, the display modes
are changed by selecting a different source size for that pipe, programming the VGA
registers, or selecting a source size and enabling the VGA.
The LVDS DDC helps to reads the panel timing parameters or panel EDID.
5.26.2.2 High Definition Multimedia Interface
The High-Definition Multimedia Interface (HDMI) is provided for transmitting uncom-
pressed digital audio and video signals from DVD players, set-top boxes and other
audiovisual 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. HDMI display interface connecting the PCH and display
devices utilizes 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) (not supported by the PCH). As shown in
Figure 5-16
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 deter-
mine 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.
PCH HDMI interface is designed as per High-Definition Multimedia Interface
Specification 1.4a. The PCH supports High-Definition Multimedia Interface Compliance
Test Specification 1.4a.
Figure 5-16. HDMI Overview
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the HDMI cable carries four differential pairs that make up the TMDS data
Functional Description
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