參數(shù)資料
型號： 82815EM
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù)： 141/163頁
文件大?。?/td> 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
Datasheet
141
To compensate for overlay color intensity loss due to the non-linear response between display devices,
the overlay engine supports independent gamma correction. In addition, the brightness, saturation, and
contrast of the overlay may be independently varied.
4.12.11. Display
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 GMCH2-M’s
integrated 230MHz 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 GMCH2-M supports a wide range of resolutions, color depths, and refresh rates via a programmable
dot clock that has a maximum frequency of 230MHz.
Table 20. Partial List of Display Modes Supported
Bits Per Pixel (frequency in Hz)
Resolution
8-bit Indexed
16-bit
24-bit
320x200
70
70
70
320x240
70
70
70
352x480
70
70
70
352x576
70
70
70
400x300
70
70
70
512x384
70
70
70
640x400
70
70
70
640x480
60,70,72,75,85
60,70,72,75,85
60,70,72,75,85
720x480
75,85
75,85
75,85
720x576
60,75,85
60,75,85
60,75,85
800x600
60,70,72,75,85
60,70,72,75,85
60,70,72,75,85
1024x768
60, 70,72,75,85
60, 70,72,75,85
60, 70,72,75,85
1152x864
60,70,72,75,85
60,70,72,75,85
60,70,72,75,85
1280x720
60,75,85
60,75,85
60,75,85
1280x960
60,75,85
60,75,85
60,75,85
1280x1024
60,70,72,75,85
60,70,72,75,85
60,70,75,85
1600x900
60,75,85
60,75,85
1600x1200
60,70,72,75
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