Pci Interrupt Request Routing - MSI MS-6580-060 - 845GE Max-L Motherboard User Manual

MS-6580 ATX Mainboard

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 "AGP/PCI/USB/LAN" IRQ pins are typically connected
to the PCI bus INT A# ~ INT H# pins as follows:
AGP
PCI Slot 1
PCI Slot 2
PCI Slot 3
PCI Slot 4
PCI Slot 5
PCI Slot 6
USB1.1 Controller 1 INT A#
USB1.1 Controller 2 INT D#
USB1.1 Controller 3 INT C#
USB2.0 Controller
LAN Controller
AGP & PCI Slot 1 & PCI Slot 6 & USB1.1 Controller 1 shared INT A#.
PCI Slot 2 & PCI Slot 5 shared INT B#.
PCI Slot 3 & USB1.1 Controller 3 shared INT C#.
PCI Slot 4 & USB1.1 Controller 2 shared INT D#.
2-30
Order 1 Order 2 Order 3 Order 4
INT A# INT B#
INT A# INT B# INT C#
INT B# INT C# INT D#
INT C# INT D# INT A#
INT D# INT A# INT B#
INT B# INT C# INT D#
INT A# INT B# INT C#
INT H#
INT E#
INT D#
INT A#
INT B#
INT C#
INT A#
INT D#