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PCI bus interrupts - Selecting correct PCI slot
Extensive information on this section is contained in the "Basic information on mainboard" manual.
To achieve optimum stability, performance and compatibility, avoid the multiple use
of ISA IRQs or PCI IRQ lines (IRQ sharing). Should IRQ sharing be unavoidable,
then all devices used and their drivers must support IRQ sharing.
Which ISA IRQs are assigned to the PCI IRQ Lines is normally automatically specified
by the BIOS (see BIOS Setup
Monofunctional expansions cards
PCI/PCI Express expansion cards require a maximum of one interrupt, which is called the PCI
interrupt INT A. Expansion cards that do not require an interrupt can be installed in any desired slot.
Multifunctional expansion cards or expansion cards with integrated PCI-PCI bridge
These expansion cards require up to four PCI interrupts: INT A, INT B, INT C, INT D. How many
and which of these interrupts are used is specified in the documentation provided with the card.
The assignment of the PCI interrupts to the IRQ Lines is shown in the following table:
On board controller
PCI INT LINE
USB 1.1
1
st
2
nd
3
rd
4
th
USB 2.0
SMBus
HD Audio
LAN
Mechanical Slot
PCI INT LINE
PCIe x16
PCIe x1
PCI 1
PCI 2
PCI 3
PCI 4
First use PCI/PCI Express slots that have a single PCI IRQ Line (no IRQ sharing). If you
must use another PCI/PCI Express slot with IRQ sharing, check whether the expansion card
properly supports IRQ sharing with the other devices on this PCI IRQ Line. The drivers of all
cards and components on this PCI IRQ Line must also support IRQ sharing.
A26361-D2151-Z212-1-8N19, edition 1
description"BIOS update", Page
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Brief description of the mainboard
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English - 5