Intel D15343-003 manual Graphics Features, Display Features, Gmch Analog Display Port

Intel® 82854 GMCH Overview

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.

2.4Graphics 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.

2.5Display 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.

2.5.1GMCH 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.

2.5.2GMCH 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.

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