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Chapter 17 PHP I/O Baseboard: Description/Setting Configuration Jumpers
187
PCI Video Controller
The onboard Cirrus Logic GD5446 PCI VisualMedia accelerator is a 64-bit DRAM-based SVGA
controller with hardware-accelerated BitBLT transfers of data, video playback, and video capture
to the frame buffer. The frame buffer is addressable through a 16-Mbyte window consisting of
three, 4-Mbyte byte-swapping apertures, and a special video aperture. The SVGA controller also
features a 64-bit GUI BitBLT engine with double-buffered, memory-mapped control registers.
The control registers are relocatable anywhere in the 64-Kbyte space; this allows multiple devices
in a single server.
The SVGA controller is fully compatible with these video standards: CGA, EGA, Hercules
graphics, MDA, and VGA. The server comes with 2 MB of onboard video DRAM allowing the
controller to support 132-column text modes and high resolution graphics with 1280 x 1024 x 16
colors. Depending on the environment, the controller displays up to 16.7 M colors in some video
resolutions.
The SVGA controller supports analog VGA monitors (single and multiple frequency, interlaced
and noninterlaced) with a maximum vertical retrace interlaced frequency of 87 Hz.
Video Modes
The CL-GD5446 provides all the standard IBM VGA modes. The following tables show all the
supported video modes.
Standard VGA Modes
Modes
in Hex
Colors
(number/
palette
size)
Char. x
Row
Char.
Cell Resolution
Display
Mode
Pixel
Freq.
(MHz)
Horiz.
Freq.
(KHz)
Vert.
Freq.
(Hz)
0, 1 16/256K 40 x 25 9 x 16 360 X 400 Text 14 31.5 70
2, 3 16/256K 80 x 25 9 x 16 720 X 400 Text 28 31.5 70
4, 5 4/256K 40 x 25 8 x 8 320 X 200 Graphics 12.5 31.5 70
6 2/256K 80 x 25 8 x 8 640 X 200 Graphics 25 31.5 70
7 Mono 80 x 25 9 x 16 720 X 400 Text 28 31.5 70
D 16/256K 40 x 25 8 x 8 320 X 200 Graphics 12.5 31.5 70
E 16/256K 80 x 25 8 x 14 640 X 200 Graphics 25 31.5 70
F Mono 80 x 25 8 x 14 640 X 350 Graphics 25 31.5 70
10 16/256K 80 x 25 8 x 14 640 X 350 Graphics 25 31.5 70
11 2/256K 80 x 30 8 x 16 640 X 480 Graphics 25 31.5 60
11* 2/256K 80 x 30 8 x 16 640 X 480 Graphics 31.5 37.9 72
11* 2/256K 80 x 30 8 x 16 640 X 480 Graphics 31.5 37.5 75
12 16/256K 80 x 30 8 x 16 640 X 480 Graphics 25 31.5 60
12* 16/256K 80 x 30 8 x 16 640 X 480 Graphics 31.5 37.9 72
12* 16/256K 80 x 30 8 x 16 640 X 480 Graphics 31.5 37.5 75
12* 16/256K 80 x 30 8 x 16 640 X 480 Graphics 35.8 43.3 85
13 256/256K 40 x 25 8 x 8 320 X 200 Graphics 12.5 31.5 70