Matrox Electronic Systems manual PCI bandwidth, Requirements, Matrox Meteor-II /1394

	Grabbing simultaneously from different boards 51
	Matrox Meteor-II /Standard, /Multi-Channel, and /Digital have
PCI bandwidth
requirements	a low susceptibility to PCI bus latency due to 4 Mbytes of
	SGRAM. In addition, sustained PCI-transfers to memory
	require the use of a high performance PCI core-logic chipset,
	such as the Intel 440LX or 440BX. If a high performance chipset
	is used with a Matrox Meteor-II /Standard or /Multi-Channel
	board, you should not have any PCI bandwidth problems when
	grabbing up to two full-sized color images simultaneously
	(using two boards). However, grabbing more than two images
	simultaneously might result in PCI bandwidth problems.
	As a reference point, grabbing one full-sized NTSC or PAL
	image in real time will require a PCI bandwidth of 35
	Mbytes/sec or 42 Mbytes/sec, respectively, when transferring in
	RGBX (32-bit) mode.
	With the Matrox Meteor-II /Digital board, you can experience
	PCI bandwidth problems when grabbing from multiple
	cameras that require a high bandwidth.
	When grabbing from three or more Matrox Meteor-II boards
	simultaneously, you will have to reduce the image size to avoid
	reaching the upper limits of the overall available bandwidth.
	Although Matrox Meteor-II /1394 supports simultaneous input
Matrox Meteor-II /1394
	from multiple cameras, there are issues with respect to both
	the PCI bus and the IEEE 1394 bus that restricts the actual
	number. With respect to the PCI bus, the available sustained
	bandwidth is a factor, like other Matrox Meteor-II boards.
	However, Matrox Meteor-II /1394 has a much smaller FIFO,
	and is therefore more susceptible to long PCI bus latencies.
	With respect to the IEEE 1394 bus, Matrox Meteor-II /1394
	OHCI-Lynx PCI-to-1394 Host controller is compatible with
	serial IEEE 1394 bus data rates of 100, 200, or 400 Mbits per
	second, and these rates are shared across the three input ports.
	Once a time slice is allocated, the device is guaranteed to have
	that time slice, and therefore transfer data; however, the time
	slices available will pose a limitation. In smaller systems, for
	example with two or three cameras, there should be enough
	time slices to handle the load.