September 2003
Intermediate to advanced
1120 pages
23h 44m
English
Content preview from PCI Express System ArchitectureBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Legacy PCI Interrupt Delivery
This section provides background information regarding the standard PCI interrupt delivery using INTx signals. This is followed by a detailed discussion of how PCI Express supports virtual INTx signaling. Readers familiar with PCI interrupt handling may wish to proceed to “Virtual INTx Signaling” on page 347.
Background — PCI Interrupt Signaling
PCI devices that use interrupts have two options:
INTx# active low-level signals that can be shared. These signals were defined in the original specification.
Message Signaled Interrupts introduced with the 2.2 version of the specification are optional for PCI devices. These MSIs are compatible with PCI Express and require no modification by devices or by PCI Express-to-PCI ...
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