PCI Topology
The Power Macintosh PCI implementation supports a PCI subsystem with the following general restrictions:
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Not more than one PCI-to-ISA bridge can be implemented.
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In systems with two host bridges,
ISA bus DMA masters located behind a PCI-to-ISA bridge may target only main memory for DMA transactions, not PCI space.
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In systems with two host bridges, PCI masters located behind one host bridge may not access PCI locations that are mapped behind a
PCI-to-PCI bridge located behind the second host bridge.
© 1999 Apple Computer, Inc. – (Last Updated 26 March 99)
