Pci Interrupt Request Routing - MSI MS-6534 User Manual

Chapter 2

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/AC'97 codec" IRQ pins are typically
connected to the PCI bus INTA#-INTH# pins as follows:
Order 1 Order 2 Order 3 Order 4
AGP INT A# INT B#
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#
USB-2 INT H#
AC97 INT B#
AGP & PCI Slot 1 shared.
PCI Slot 2 & AC97 shared.
PCI Slot 1~3: Bus Master
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