Chapter 2
2-24
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/ACHIP” IRQ pins are typically connected
to the PCI bus INT A# ~ INT D# 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 A# INT B# INT C# INT D#
PCI Slot 5 INT B# INT C# INT D# INT A#
NEC USB 2.0 INT A# INT B# INT C# INT D#
LAN Controller INT C# INT D# INT A# INT B#
ACHIP ATA 133 INT D# INT A# INT B# INT C#
AGP & PCI Slot 4 & NEC USB2.0 shared.
PCI Slot 1 & PCI Slot 5 shared.
PCI Slot 2 & LAN shared.
PCI Slot 3 & ACHIP ATA133 shared.
PCI Slot 1~5: Bus Master
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