Pci Interrupt Request Routing - MSI MS-6330 Technical 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 "AGP/PCI/USB/AC97" IRQ pins are typically connected to the
PCI bus INTA#-INTD# pins as follows:
Order 1 Order 2 Order 3 Order 4
AGP INT A# INT B# INT C# INT D#
PCI Slot 1 INT B# INT C# INT D# INT A#
PCI Slot 2 INT C# INT D# INT A# INT B#
PCI Slot 3 INT D# INT A# INT B# INT C#
PCI Slot 4 INT B# INT C# INT D# INT A#
PCI Slot 5 INT C# INT D# INT A# INT B#
USB-1 INT C#
USB-2 INT C#
AC97 INT B#
PCI Slot 1 & PCI Slot 4 & AC97 shared.
PCI Slot 2 & PCI Slot 5 & USB-1 & USB-2 shared.
PCI Slot 1~5: Bus Master
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Hardware Setup