82G33 datasheet(364/437 Pages) INTEL

364 / 437 page

Functional Description

364

Datasheet

10.6.1.4

DDC (Display Data Channel)

DDC is a standard defined by VESA. Its purpose is to allow communication between

the host system and display. Both configuration and control information can be

exchanged allowing plug- and-play systems to be realized. Support for DDC 1 and 2 is

implemented. The GMCH uses the DDC_CLK and DDC_DATA signals to communicate

with the analog monitor. The GMCH generates these signals at 2.5 V. External pull-up

resistors and level shifting circuitry should be implemented on the board.

The GMCH implements a hardware GMBus controller that can be used to control these

signals allowing for transactions speeds up to 400 kHz.

10.6.2

Digital Display Interface

The GMCH has several options for driving digital displays. The GMCH contains two

SDVO ports that are multiplexed on the PEG interface. When an external PEG graphics

accelerator is not present, the GMCH can use the multiplexed SDVO ports to provide

extra digital display options. These additional digital display capabilities may be

provided through an ADD2/Media Expansion Card, which is designed to plug in to a

PCI Express connector.

10.6.2.1

Multiplexed Digital Display Channels – Intel® SDVOB and Intel®

SDVOC

The GMCH has the capability to support digital display devices through two SDVO

ports multiplexed with the PEG signals. When an external graphics accelerator is used

via the PEG port, these SDVO ports are not available.

The shared SDVO ports each support a pixel clock up to 200 MHz and can support a

variety of transmission devices.

SDVOCTRLDATA is an open-drain signal that will act as a strap during reset to tell the

GMCH whether the interface is a PCI Express interface or an SDVO interface. When

implementing SDVO, either via ADD2 cards or with a down device, a pull-up is placed

on this line to signal to the GMCH to run in SDVO mode and for proper GMBus

operation.

10.6.2.2

ADD2/Media Expansion Card (MEC)

When an Intel® 3 Series Express Chipset platform uses a PEG connector, the

multiplexed SDVO ports may be used via an ADD2 or MEC card. The ADD2 card will be

designed to fit a standard PCI Express (x16) connector.

10.6.2.3

TMDS Capabilities

The GMCH is compliant with DVI Specification 1.0. When combined with a DVI

compliant external device and connector, the GMCH has a high speed interface to a

digital display (e.g., flat panel or digital CRT). The GMCH can drive a flat panel up to

1920x1200 or a dCRT/HDTV up to 1400x1050. Flat Panel is a fixed resolution display.

The GMCH supports panel fitting in the transmitter, receiver, or an external device,

but has no native panel fitting capabilities. The GMCH will however, provide unscaled

mode where the display is centered on the panel.

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