Magma PCI Expansion System PE6RR Manuel d'utilisateur télécharger pdf (Page 45)

MAGMA

Appendix B Need More Slots? 37

2. The 4 and 7 Slot Magma Expansion Systems each add two (2)

PCI to PCI Bridges to the PCI Local Bus. The 13 Slot adds

three (3) PCI to PCI Bridges to the PCI Local Bus. The PE6R4t

adds one (1) bridge. These bridges are the communication

paths between the PCI cards and the computer resources.

Most computers allow multiple bridges (and thus PCI buses) to

be correctly configured. Some computers, unfortunately, place

an arbitrary limit on the number of bridge levels that can be

traveled during power-on configuration. Your computer “power-

on-software” should be PCI Specification 2.1 compliant in order

to effectively use a Magma PCI Expansion System. For "fan-

out" and "daisy chained" system configurations, where more

than one PCI expansion system is being used, you should

count all of the bridge levels to your most deeply nested PCI

bus to determine the maximum number of bridge levels that

must be traveled.

3. For easier understanding, the PCI Local Bus should be viewed

as a “Resource Toll road” that runs from the computer CPU

(resource home), through the “Toll Booths” (the PCI bridges),

to the “Resource Users” (PCI Cards). As in the case of a real

Toll Road, the more Toll Booths you have to slow down a

“nanosecond” for, the longer it will take you (your data) to get

from the PCI Card to the CPU and back again. Under most

circumstances the effect cannot even be detected. However,

under other conditions, it can be important to know about.

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Magma PCI Expansion System PE6RR Manuel d'utilisateur Page 45