Data interfaces 41
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The polarity of the active and inactive levels of the trigger
signal is software programmable.
Matrox Meteor-II /Digital can also operate in asynchronous
reset mode. In this mode, the digitizer resets the camera to
begin a new frame when the trigger signal is received.
Data interfaces
Video Interface ASIC
The Matrox Meteor-II /Digital board has a VIA, which acts
mainly as a video-to-PCI bridge. The VIA is capable of
high-speed image transfers to Host memory or other PCI
devices across the PCI bus. The VIA uses video transfer memory
to store data until the PCI bus becomes available. There is 4
Mbytes (SGRAM) and 16 Mbytes (SDRAM) of video transfer
memory on Matrox Meteor-II /Digital for PCI and PC/104-Plus,
respectively. On the PCI form factor, the VIA also supports
image transfers across the VMChannel to one or more Matrox
Imaging boards for accelerated image processing or display.
Simultaneous data
streams
Matrox VIA can manage up to two simultaneous data streams.
For example, it can grab into video transfer memory, and
concurrently transfer data over the VMChannel or PCI buses.
General features
The VIA is capable of separating image data into two, three, or
four 8-bit or two 16-bit components (for example, RGB packed
to RGB planar). This mechanism is also used to merge line
segments of monochrome multi-tap cameras.
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