Root complex

An example of the PCI Express topology, displaying the position of a root complex.[1]

In a PCI Express (PCIe) system, a root complex device connects the processor and memory subsystem to the PCI Express switch fabric composed of one or more switch devices.

Similar to a host bridge in a PCI system, the root complex generates transaction requests on behalf of the processor, which is interconnected through a local bus. Root complex functionality may be implemented as a discrete device, or may be integrated with the processor. A root complex may contain more than one PCI Express port and multiple switch devices can be connected to ports on the root complex or cascaded.[2]

References

  1. ↑ Ravi Budruk (2007-08-21). "PCI Express Basics" (PDF). PCI-SIG. p. 7. Retrieved 2015-04-08.
  2. ↑ "Choosing the Right Programmable Logic Solution for PCI Express Applications". Retrieved 31 March 2010.