Specifications

74 Intel
®
Atom™ processor CE4100 Ref# 420826
Platform Design Guide
Intel Confidential
6.2 HDMI Transmitter Interface
The Intel
®
Atom™ processor CE4100 has an HDMI/DVI version 1.3 compliant transmitter
interface, with HDCP. An HDMI cable has four differential pairs that carry AV data and clock
over a Transition Minimized Differential Signaling (TMDS) protocol. In addition, HDMI carries
a VESA DDC (Enhanced Display Data Channel) channel. DDC uses I
2
C protocol and is used
for configuration and status exchange between the HDMI driver and HDMI receiver.
The HDMI unit transmits video pixel data from the VDC output and inserts the audio and
information packets. No audio processing is done in the HDMI unit. The HDMI unit has its
own TMDS clock PLL to support deep-color and high-bit rate audio.
As seen in Figure 6-8, there are three interfaces for HDMI l
ink.
• Four differential TMDS pairs (3 data and 1 clock channel) that carry audio, video, and
auxiliary data
• An I
2
C-like bus (DDC) for carrying status, configuration data, and key exchange
• Consumer Electronics Control (CEC) is an optional interface that carries remote control
type commands.
Figure 6-8. HDMI Interface Diagram