Matrox Corona Installation And Hardware Reference page 13

Host interface
Digital interface and
VMChannel interface
Additional features
When capturing non-standard video, Matrox Corona uses
back-to-back PCI transfers to send data to the Host memory
and to the display frame buffers. In this case, Matrox VIA
alternates between video transfers to the Host memory and
video transfers to the frame buffers.
Matrox VIA has a 32-bit wide, master/slave PCI Host interface.
When in bus master mode, Matrox VIA can perform transfers
without requiring continuous Host intervention.
Matrox VIA uses a 2 Mbyte temporary buffer to prevent loss of
data during long PCI latencies, encountered in heavily loaded
systems.
Matrox VIA resides on the secondary PCI bus. This secondary
PCI bus can be used as an additional direct path to display.
The primary PCI bus (Host bus) and the secondary PCI bus are
capable of 132 Mbytes/sec peak transfer rates.
Matrox VIA is also equipped with a 32-bit
bus-controller-capable VMChannel interface and a 24-bit
bi-directional digital interface. These are designed to interface
with other Matrox boards. For example, the VMChannel can be
used to link multiple Matrox Corona boards to provide multiple,
independent video inputs to a single display without loading
the PCI bus. The digital interface can be used to interface
Matrox Corona with the RS-422/LVDS companion digital-input
board. Using either the VMChannel interface or digital
interface, Matrox Corona can be linked to a Genesis system for
processing.
Matrox Corona has an RS-232 serial interface for remote
programming of an intelligent camera, motion control unit, or
program logic controller (PLC).
Matrox Corona 13