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On-board memory
21
On-board memory
Matrox Odyssey XG features up to 128 Mbytes of DDR SDRAM. Memory is
used to store data for the GPU and is accessed via the GPU itself.
You can map some, or all, memory onto the PCI bus so that you can access this
memory using a Host pointer or you can access it directly from another
PCI/PCI-X bus master.
SIB
The Matrox System Interface Bridge (SIB) is a PCI-X data router capable of
connecting up to four data paths. On Matrox Odyssey XG, there are two SIBs:
one is a bridge to the high-speed Matrox Odyssey internode link ports, and the
other is an interface between the Host and the GPU. Each SIB can communicate
at a maximum data rate of 1 Gbytes/sec.
Internode link ports
Matrox Odyssey XG includes a pair of high-speed internode link ports. Matrox
Odyssey XG can receive video streams from other Matrox Odyssey Xpro boards
via these ports, in effect offloading the Host bus. All transfers across the internode
link ports are routed using the SIB.
The internode link ports provide point-to-point PCI-X connections that deliver
up to 1 Gbyte/sec of bandwidth.
PCI/PCI-X interface
Matrox Odyssey XG is a PCI-X board. PCI-X is a high-performance
backwards-compatible enhancement to the conventional PCI bus specification.
As such, Matrox Odyssey XG can transfer data using either the Host's PCI bus or
PCI-X bus, depending on the slot used by the board.
Using the Host PCI/PCI-X bus, Matrox Odyssey XG can copy data between its
main memory, the Host, and any other memory mapped onto the PCI/PCI-X
bus. The PCI/PCI-X bus connects all Matrox Odyssey XG components to the
Host, and to devices such as a frame grabber.
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