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APOLLO user manual
Display modes
The three display output ports can be configured in a number of display modes, to allow
for independent display timings and extended desktop/multi-monitor operating modes.
The following table shows the display configurations supported by the APOLLO chipset:
Display configuration mode
Single
Twin
Clone
Extended
Display interfaces
The APOLLO board supports a range of display interfaces. Details of these are provided
below.
Analogue RGB
A standard progressive scan analogue CRT interface is provided from the GMCH. This is
interfaced to a high density DB15 VGA connector mounted on the board. A 350MHz
RAMDAC provides support for resolutions up to 2048x1536 at 75Hz refresh rate. For
connector details, see page 36.
LVDS
The GMCH has in-built dual channel ANSI/TIA/EIA –644-1995 compliant LVDS drivers.
These allow for the direct connection of LVDS LCD panels to the APOLLO board. A high-
speed surface mount connector interfaces these signals to an external cable. Spread
spectrum clocking is also available to reduce EMI. See
page 76, for further information. For connector details, see page 44.
The 3.3V power provided on the LVDS connector (J17) is switched through an onboard
MOSFET controlled by the video BIOS. This ensures that power is correctly sequenced
to the LCD panel. The maximum current that can be supplied by the onboard switch is
1.5A, which is generally sufficient for most LCD displays. In cases where additional
current is required, the switched 3.3V power should be used to switch an external power
source.
When configuring an LVDS display, the native resolution should be selected in the BIOS
to ensure the correct timing set is used for the display. See
settings, page 76.
94
Description
Normal desktop configuration, single monitor
Two displays, same content, single resolution
Two displays, same content, independent timings
Two displays, different content, independent resolutions
Video (Intel IGD) control
settings,
Video (Intel IGD) control
Issue G
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