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Brief description of mainbo ard

PCI bus interrupts - Selecting correct PCI slot

Extensive information on this section is contained in the manual "Basic informa tion on mainboard".

To achieve optimum stability, performance an d compatibility, avoid the multiple use

of ISA IRQs or PCI IRQ L ines (I RQ sharing). Should IR Q sharing b e 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 expansion cards

PCI/PCI Express expansion cards require a max imum of one interrupt, which is called the PCI

interrupt INT A. Expansion cards that do not require an interrup t ca n be installed in any desired slot.

Multifunctiona l expansion cards or expansion cards with integrated PCI-PCI bridge

These expansion cards require up to fo ur 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:

Mechanical slot

PCI INT LINE 1 (A) 2 (B) 3 (C) 4 (D) 5 (E) 6 (F) 7 (G) 8 (H)

PCIe x16 AB

------

PCI 1

PCI 2

Use ﬁrst PCI/PCI Express slots that have a single PCI IRQ L ine (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 IR Q Line. The drive rs of all

cards and components on this PCI IRQ Line must also support IRQ sharing.

A26361-D2840-Z210-1-8 N19, edition 1 English - 5

Fujitsu D2840 User Manual

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