Rastergraf
General Information 1-19
1.6.1 TV Display
The Topaz/Stratus/Garnet supports base-band TV display output in either
NTSC or PAL video formats. Both composite and S-Video (Y/C) are
available.
The SM731 TV Encoder is somewhat limited in that it only allows 480
line output in NTSC mode. If your image is different from that, then you
have to use the scaler to down- or up-size the image accordingly. Use of
the scaler will affect the overall throughput of the chip and can limit the
display size and video input pixel rates.
1.6.2 Analog RGB Displays
The boards are able to support display resolutions from 640 x 480 (VGA)
up to 1600 x 1200 at up to 24 bpp. The Topaz/Stratus/Garnet can support a
secondary VGA port, in which case both ports should be limited to 1024 x
768. The Secondary VGA output uses the spare pins on the DVI-I front
panel connector or can be specified at order time to use the rear panel DVI
output pins.
The secondary VGA DAC port is driven by the “Flat Panel” display
controller section of the SM731. Displays ranging up to 1024 x 768 are
practical when both channels are active. Some screen refresh-related
artifacts may appear when a larger display format is used due to
bandwidth limitations in the SM731.
1.6.3 STANAG 3350 A-C (Topaz/Duros)
STANAG Class A
875 Line, Interlaced
STANAG Class B
625 Line, Interlaced
STANAG Class B
525 Line, Interlaced
In the case of STANAG output, the video input multiplexer PLD is
“stolen” in order to generate the special timing modes required for
STANAG. For this reason, STANAG output automatically disables video
input. In addition, the secondary VGA DAC is also “stolen”. It is wire-
OR’d as an additional current source into the primary VGA output to
generate the sync and blanking levels required by STANAG. Thus, you
also lose the second VGA port. However, the STANAG implementation is
extremely good, even including negative (below ground) sync. Properly
programmed (using Rastergraf software) TopazPMC/1 and Duros boards
are highly compliant to STANAG 3350 A-C in all aspects.
Содержание Duros
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