AC82G41SLGQ3 Datasheet, PDF (537/604 Pages) Intel Corporation – Intel® 4 Series Chipset Family

Functional Description
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 GMCH are AC coupled and
needs level shifter to convert the AC coupled signals to the HDMI compliant digital
signals.
Note:
HDMI support on 82B43 is enabled via Intel® Upgrade Service
Figure 11. HDMI Overview
GMCH/
HDMI
Source
HDMI Tx
TMDS data channel 0
TMDS data channel 1
TMDS data channel 2
TMDS Clock channel
Hot Plug Detect
Display Data Channel (DDC)
CEC Line
HDMI
Sink
HDMI Rx
13.5.2.2
13.5.2.3
Digital Video Interface (DVI)
GMCH 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 are connected along with
the digital data and clock signals from one of the digital ports. When a system has
support for 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 GMCH are AC coupled and
needs level shifter to convert the AC coupled signals to the HDMI compliant digital
signals.
DDPC_CTRLDATA and DDPC_CTRLCLK
The GMCH incorporates an I²C bus for digital Port C to allow communication between
the host system and display. Both configuration and control information can be
exchanged between the system and the digital monitor allowing plug- and-play
systems to be realized.
The GMCH generates these signals at 3.3 V. External pull-up resistors and level shifting
circuitry should be implemented on the board. This signal shall be used to configure
digital port C as either HDMI or DVI.
Datasheet
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