Instruction manual

Hardware Setup
2-25
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:
Order 1 Order 2 Order 3 Order 4
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 INT D# INT A# INT B# INT C#
USB-2 INT D# INT A# INT B# INT C#
AC97 INT C# INT D# INT A# INT B#
PCI Slot 3 & AC97 codec shared.
PCI Slot 1~3: Bus Master.