Pci Interrupt Request Routing - MSI MS-6377 Manual

PCI Interrupt Request Routing

The IRQ, abbreviation of interrupt request line and pronounced I-R-Q,
are hardware lines over which devices can send interrupt signals to the
microprocessor. The "PCI/S.B./LAN/VGA/SCSI" IRQ pins are typically con-
nected to the PCI bus INTA#-INTD# pins as follows:
INT A# INT B# INT C# INT D#
32-bit PCI Slot 1
32-bit PCI Slot 2
32-bit PCI Slot 3
S.B.
LAN1
LAN2
VGA
SCSI1
SCSI2
64-bit PCI Slot 1
64-bit PCI Slot 2
32-bit PCI Slot 1~3: BUS MASTER
64-bit PCI Slot 1~2: BUS MASTER
0 1 2
1 2 3
2 3 0
0 1 2
3
4
5
8
9
6 7 8
10 11 12
2-27
Hardware Setup
3
0
1
3
9
13