February 2003
Intermediate to advanced
592 pages
11h 47m
English
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PCI-X Bus Issues
PCI-X is a superset of the PCI bus that provides a relaxed ordering bit, which changes the PCI-X ordering rules from PCI. PCI-X also uses different transaction types and protocols, requiring a very different bridge design than PCI; however, the bridge must be compatible with PCI protocols.
PCI-X Ordering Requirements
PCI-X ordering is based on the same principles as PCI; thus, the ordering rules are very similar. In fact, the only differences are due to the Relaxed Ordering supported by PCI-X. Table 20-4 on page 468 lists the PCI-X ordering rules. Note that Posted Memory Writes (PMW) and Split Request Completions (SRC) support Relaxed Ordering, yielding to possible ordering scenarios for each case in Column 1.
PCI-X also supports ...
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