Siemens D2250 Mode D'emploi page 16

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Mainboard D2250

PCI bus interrupts - Selecting correct PCI slot

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

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

involved devices and their drivers must support IRQ sharing.

PCI IRQ Lines connect PCI slots and onboard components to the interrupt controller. PCI IRQ Lines

are permanently wired on the mainboard.

Which ISA IRQs are assigned to the PCI IRQ Lines is normally automatically specified by the BIOS

(see "BIOS Setup" description).

Monofunctional expansions cards

Standard PCI 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:

PCI INT

LINE

USB 1.1

1 (A)

2 (B)

3 (C)

4 (D)

5 (E)

6 (F)

7 (G)

8 (H)

Use the first PCI slots that have a single PCI IRQ Line (no IRQ sharing). If you must use another PCI

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

Controller or slot INT

On board controller

A26361-D2250-Z110-1-8N19, edition 2

Mechanical slot

PCI slot