Specifications

CompuLab Ltd. IPC2 – Hardware Specification Page 53 of 83
5.2.1 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 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). CEC is not supported on the processor. As shown in Figure 13 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 are AC coupled and needs level shifting to convert the AC coupled signals to the HDMI
compliant digital signals. HDMI interface is designed as per High-Definition Multimedia Interface
Specification 1.4a.
The processor HDMI interface is designed in accordance with the High-Definition Multimedia
Interface with 3D, 4K, Deep Color, and x.v. Color.
Figure 13 – HDMI Link Diagram