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PCIe Devices - PLX Technology

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PCI/PCI-X/<strong>PCIe</strong> Bridges<br />

n<br />

Bridges are the mechanism that PCI devices use<br />

communicate to the host system resources, to<br />

other PCI devices, and to other PCI busses in the<br />

system<br />

n<br />

Several bridge types have been defined<br />

l<br />

l<br />

Host/PCI and host/PCI-X bridges<br />

– If multiple host bridges in system, one must be hardwired to<br />

indicate access to PCI bus 0<br />

– PCI/PCI (P-P bridge), PCI-X/PCI-X, and PCI/PCI-X bridges are<br />

defined<br />

The <strong>PCIe</strong> root complex is the equivalent to the PCI host-to-<br />

PCI bus bridge, only it implements the <strong>PCIe</strong> added<br />

functions, the <strong>PCIe</strong> protocol stack, and the <strong>PCIe</strong> serial link<br />

– <strong>PCIe</strong> switches are defined in terms of P-P bridges<br />

Copyright by Dashcourses, Inc. 2009<br />

1-37

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