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Raptor MicroATX – Installation Guide
•The GMCH directly drives a standard progressive scan monitor up to a
resolution of 1600x1200 pixels.
•The GMCH provides a Digital Video Out interface to connect an
external device to drive a 1280x1024 resolution non-scalar DDP digital
Flat Panel with appropriate EDID 1.2 data or digital CRTs. The
interface has 1.8V signaling to allow it to operate at higher frequencies.
Display (CRT)
The display function contains a RAM-based Digital-to-Analog
Converter (RAMDAC) that transforms the digital data from the
graphics and video subsystems to analog data for the monitor. The
GMCH's integrated 230 MHz RAMDAC provides resolution support
up to 1600x1200. Circuitry is incorporated to limit the switching noise
generated by the DACs. Three 8-bit DACs provide the R, G, and B
signals to the monitor. Sync signals are properly delayed to match any
delays from the D-to-A conversion. Associated with each DAC is a 256
pallet of colors. The RAMDAC can be operated in either direct or
indexed color mode. In Direct color mode, pixel depths of 15, 16, or 24
bits can be realized. Non-interlaced mode is supported. Gamma
correction can be applied to the display output.
The GMCH supports a wide range of resolutions, color depths, and
refresh rates via a programmable dot clock that has a maximum
frequency of 230 MHz.
Table D-1 in the next page shows a partial list of display modes
supported.
For information about jumper settings and connector pin-outs look up
for the following tables:
•
Table 1-11 jumper settings for LCD Panel (optional) Voltage
Selection.
•
Table 1-12 jumper settings for Enable/Disable the I2C
Channel of the DVO Connector.
•
Table A-20 Pin out of the LCD Header Connector (optional).
Connector J39 (DVO) and J19 (VGA) have standard industry pin outs.
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