The History Multi-Processor Implementations Using PCI
To better understand the implementation proposed for PCI Express, one needs to first understand the PCI implementation.
PCI was originally defined in 1992 for personal computers. Because of the nature of PCs at that time, the protocol architects did not anticipate the need for multiprocessors. Therefore, they designed the system assuming that the host processor would enumerate the entire memory space. Obviously, if another processor is added, the system operation would fail as both processors would attempt to service the system requests.
1Several methodologies were subsequently invented to accommodate the requirement for multiprocessor capabilities using PCI. The most popular implementation, ...
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