NH82810 S L7XK Intel, NH82810 S L7XK Datasheet - Page 96

• Manufacturer Part Number: NH82810 S L7XK
• Manufacturer: Intel

Specifications of NH82810 S L7XK

• Lead Free Status / RoHS Status: Compliant

Intel
4.6.9.
4.6.10.
4.6.11.
96
®
82810E (GMCH)
Hardware Cursor
Overlay Engine
Display
The internal graphics device of the GMCH allows up to an unlimited number of cursor patterns to be
stored in the display cache or system memory. Two sets of registers, contain the x and y position of the
cursor relative to the upper left corner of the display. The following four cursor modes are provided:
The overlay engine provides a method of merging either video capture data (from an external PCI Video
Capture Adapter) or data delivered by the processor, with the graphics data on the screen. Supported data
formats include YUV 4:2:2, YUV 4:2:0, YUV 4:1:0, YUV 4:1:1, RGB15, and RGB16. The source data
can be mirrored horizontally or vertically or both. Overlay data comes from a buffer located system
memory. Additionally, the overlay engine can be quadruple buffered in order to support flipping between
different overlay images. Data can either be transferred into the overlay buffer from the host or from an
external PCI adapter, such as DVD hardware or video capture hardware. Buffer swaps can be done by
the host and internally synchronized with the display VBLANK.
The internal graphics device of the GMCH can accept line widths up to 720 pixels. In addition, overlay
source and destination chromakeying are also supported. Overlay source/destination chromakeying
enables blending of the overlay with the underlying graphics background. Destination color/chroma
keying can be used to handle occluded portions of the overlay window on a pixel by pixel basis that is
actually an underlay. Source color/chroma keying is used to handle transparency based on the overlay
window on a pixel by pixel basis. This is used when “blue screening” an image in order to overlay the
image on a new background later.
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.
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.
•
•
•
•
32x32 2 bpp AND/XOR 2-plane mode
64x64 2 bpp 3-color and transparency mode
64x64 2 bpp AND/XOR 2-plane mode
64x64 2 bpp 4-color mode
Datasheet
R