Brief description of mainbo ard
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 b e unavoidable,
then all involved devices and thei r drivers must support IRQ sharing.
Which ISA IRQs are assigned to the PCI IRQ Lines is normally automatically
specified by the BIO S ( see "BIOS Setup" de scription).
Monofu nct ional expansion 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 interrup t can be inst alled in any desired slot.
Multifunctio nal expansi on cards or expa nsio n 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 the se interrupts are used is speci fied in th e documentation provided with the card.
The assignment of the PCI interrupts to the IRQ Lines is show n in the following table:
On-board controller
PCI INT LINE 1 (A) 2 (B) 3 (C) 4 (D) ID SEL Dev# Function# Bus#
USB 1.0
-----
02h/04h 0 0
USB 2.0
-----
0Bh 1 0
SATA 0/1
-----
09h 0 0
HD Audio
-----
07h 0 0
NV LAN
-----
0Ah 0 0
BCM LAN
-----
00h 0
5
VGA
-----
00h
MCP78
0
2
MCP78
A26361-D2721-Z110-1-7419, edition 3 English - 5
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