Technical Reference
2.7 PCI Conventional Interrupt Routing Map
This section describes interrupt sharing and how the interrupt signals are connected between the PCI Conventional bus connectors and onboard PCI Conventional devices. The PCI Conventional specification describes how interrupts can be shared between devices attached to the PCI Conventional bus. In most cases, the small amount of latency added by interrupt sharing does not affect the operation or throughput of the devices. In some special cases where maximum performance is needed from a device, a PCI Conventional device should not share an interrupt with other PCI Conventional devices. Use the following information to avoid sharing an interrupt with a PCI Conventional
PCI Conventional devices are categorized as follows to specify their interrupt grouping:
•INTA: By default, all
•INTB: Generally, the second interrupt on
•INTC and INTD: Generally, a third interrupt on
The
For example, using Table 16 as a reference, assume an
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