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VFG-M
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High
Performance, 2 Channel
Video Digitizer and Graphics Display,
with 2-Port USB Controller
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Rastergraf's
VFG-M is a single PMC video input and graphics display controller.
It has a two channel OPTi 82C861 FireLink USB controller,
two Conexant Bt848A Media Decoders, and two Cirrus Logic CL-GD7555
Matterhorn XVGA/SVGA compatible 64-bit graphics accelerators.
The USB, Bt848As, and CL-GD7555s are isolated from the host
PMC bus by a Texas Instruments PCI2031 PCI-PCI bridge. The
CL-GD7555 XVGA Graphics Accelerator includes 64-bit BitBLT
engine and and can yield performance in excess of 30M Winmarks.
One CL-GD7555 (Channel A) can function as the system VGA controller
with on-board BIOS PROM. Otherwise, Channel B is identical
and independent
The
CL-GD7555 supports 8, 15, 16, and 24-bit true color modes
and mapped RGB and YUV color formats. It includes a color-keyed
overlay feature and a graphics cursor with a 64 x 64 x 2 bit
map. DDC (display data channel) lines enable the computer
to control the monitor.
Programmable
timing registers control the video timing, supporting formats
up to 1280 x 1024 x 24 bpp. The analog RGBHV outputs can drive
a standard multi-sync monitor up to 1280 x 1024. Note: composite
sync is not supported.
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| Features |
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Two
independent graphics controllers using Cirrus CL-GD7555
64-bit graphics accelerator
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Each
display is programmable for 8, 16, or 24 bits/pixel
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Each
channel has 4 MB EDO DRAM
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Analog
(RGB) up to 1280 x 1024
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Programmable
video timing
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Gamma
correction
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Hardware
scroll, pan, and cursor
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VGA
support on Channel A
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Serial
EEPROM on Channel A
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Two
independent video input controllers drive PCI bus and
Cirrus Zoom Video Ports
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2
channel USB hub controller
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