Mainboard D2438
PCI bus interrupts - Selecting correct PCI slot
Extensive information on this section is contained in the manual "Basic information on mainboard".
i
To achieve optimum stability, performance and compatibility, avoid the multiple use of IRQ
Lines (IRQ sharing). Should IRQ sharing be unavoidable, then all involved devices 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" description).
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:
Controller or slot INT
Mechanical slot
On board controller
1 2 3 4 5 6 7
USB 1.1 PCIe PCI
PCI
INT
LINE
1
st
2
nd
3
rd
4
th
USB 2.0
SMBus
D Audio
Firewire
LAN
x16 x1 X4 1 2 3 4
1 (A)
- - - - - - X X A D B - - - -
2 (B)
- - - - - - - - B A C - - - -
3 (C)
- - - - - - - - - B D D C A D
4 (D)
- - - - - X - - - C A C D B A
5 (E)
- - - X - - - X - - - - - - - -
6 (F)
- - X - - - - - - - - B A C B
7 (G)
- X - - - - - - - - - A B D C
8 (H)
X - - - X - - - - - - - - - -
Use first 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.
4 - English A26361-D2438-Z110-1-8N19, edition 1
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