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Bus Hierarchy
The following figures are representative of the PCI Bus hierarchies for
the 4 Slot CardBus and PCI to PCI Expansion Systems. These figures
pictorially conveys the overall PCI bus topology of the system.
The key point in the following figure of the 4 Slot Topology is the
connecting cable between the Host Interface Card and the Expansion
Interface is actually a PCI bus itself.
In general, we do not know what the actual Bus numbers are. We only
know how they increment starting from the MAGMA PCI Host Interface.
4 Slot Topology
NOTE
All PCI cards installed in the 4 Slot PCI to PCI Expansion Systems wil
appear on PCI Bus 2. In Apple G4s, Bus 0 is internal; so all Busses
are incremented by 1. All PCI Cards installed in the 4 Slot CardBus
PCI Expansion System will appear on Bus 3. In laptop computers, the
CardBus slot is Bus 1, so all Busses are incremented by 1.
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