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82854 GMCH Overview
D15343-003 23
The GMCH system memory architecture is optimized to maintain open pages (up to 16-KB page
size) across multiple rows. As a result, up to 16 pages across four rows is supported. To
complement this, the GMCH will tend to keep pages open within rows, or will only close a single
bank on a page miss. The GMCH supports only four bank memory technologies.
2.4 Graphics Features
The GMCH IGD provides a highly integrated graphics accelerator delivering high performance
2D, 3D, and video capabilities. With its interfaces to UMA using a DVMT configuration, an analog
display, and two digital display ports, the GMCH can provide a complete graphics solution.
The GMCH also provides 2D hardware acceleration for block transfers of data (BLTs). The BLT
engine provides the ability to copy a source block of data to a destination and perform raster
operations (for example, ROP1, ROP2, and ROP3) on the data using a pattern, and/or another
destination. Performing these common tasks in hardware reduces CPU load, and thus improves
performance.
High bandwidth access to data is provided through the system memory interface. The GMCH uses
Tiling architecture to increase system memory efficiency and thus maximize effective rendering
bandwidth. The Intel
®
82854 GMCH improves 3D performance and quality with 3D Zone
rendering technology. The Intel
®
82854 GMCH also supports Video Mixer rendering, and Bi-
Cubic filtering.
2.5 Display Features
The Intel
®
82854 GMCH has three display ports: one analog and two digital. With these interfaces,
the GMCH can provide support for a progressive scan analog monitor and two DVO ports. The
native graphic mode is able to deliver up to two streams of data via the two DVO ports.
2.5.1 GMCH Analog Display Port
The Intel
®
82854 GMCH has an integrated 350-MHz, 24-bit RAMDAC that can directly drive a
progressive scan analog monitor pixel resolution up to 1600x1200 at 85-Hz refresh and up to
2048x1536 at 75-Hz refresh. In the native graphic mode, the Analog display port can be driven by
Pipe A or Pipe B.
2.5.2 GMCH Integrated DVO Ports
The Intel
®
82854 GMCH provides a digital display channel that is capable of driving a pixel clock
up to 165 MHz.
The GMCH supports three ARIB planes of graphics: Still Picture Plane, Text and Graphic Plane,
and Superimpose Text Plane at a frame rate of 10 fps. A minimum of two displays are supported.
The ARIB plane resolutions supported can be found in Figure 8.
In native graphics mode, the GMCH supports a single display up to 60 fps real time with maximum
resolution of 720 x 480 pixels.