Pci Interrupt Request Routing - MSI G52-MA00353 User 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/USB/AC97 IRQ pins are typically connected to the
PCI bus INTA#-INTD# pins as follows:
PCI Slot 1 INT A# INT B# INT C# INT D#
PCI Slot 2 INT B# INT C# INT D# INT A#
PCI Slot 3 INT C# INT D# INT A# INT B#
USB-1
USB-2
AC97
PCI Slot 3 & AC97 codec shared.
PCI Slot 1~3: Bus Master.
Order 1 Order 2 Order 3 Order 4
INT D# INT A# INT B# INT C#
INT D# INT A# INT B# INT C#
INT C# INT D# INT A# INT B#
2-25
Hardware Setup