Chapter 2
2-26
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/RTL8100” IRQ pins are typically con-
nected 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#
RTL8100 INT D#
PCI Slot 3 & AC97 shared.
USB & RTL8100 shared.
PCI Slot 1~3: Bus Master
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