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2.6 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 add-in card.
PCI Conventional devices are categorized as follows to specify their interrupt grouping:
•
INTA: By default, all add-in cards that require only one interrupt are in this category. For
almost all cards that require more than one interrupt, the first interrupt on the card is also
classified as INTA.
•
INTB: Generally, the second interrupt on add-in cards that require two or more interrupts is
classified as INTB. (This is not an absolute requirement.)
•
INTC and INTD: Generally, a third interrupt on add-in cards is classified as INTC and a fourth
interrupt is classified as INTD.
The ICH7DH has eight Programmable Interrupt Request (PIRQ) input signals. All PCI
Conventional interrupt sources either onboard or from a PCI Conventional add-in card connect to
one of these PIRQ signals. Some PCI Conventional interrupt sources are electrically tied together
on the board and therefore share the same interrupt. Table 14 shows an example of how the
PIRQ signals are routed.
Table 14.
PCI Interrupt Routing Map
PCI Interrupt Source
ICH7DH LAN
PCI bus connector 1
PCI bus connector 2
IEEE-1394a controller
NOTE
In PIC mode, the ICH7DH can connect each PIRQ line internally to one of the IRQ signals (3, 4, 5,
6, 7, 9, 10, 11, 12, 14, and 15). Typically, a device that does not share a PIRQ line will have a
unique interrupt. However, in certain interrupt-constrained situations, it is possible for two or
more of the PIRQ lines to be connected to the same IRQ signal. Refer to Table 13 for the
allocation of PIRQ lines to IRQ signals in APIC mode.
PCI interrupt assignments to the USB ports, Serial ATA ports, and PCI Express ports are dynamic.
ICH7DH PIRQ Signal Name
PIRQA
PIRQB
PIRQC
PIRQD
PIRQE
PIRQF
INTA
INTD
INTA
INTC
INTB
INTA
Technical Reference
PIRQG
PIRQH
INTB
INTC
INTA
INTD
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