
Chapter 2
2-26
PCI Interrupt Request Routing
The IRQ, acronym of interrupt request line and pronounced I-R-Q, are
hardware lines over which devices can send interrupt signals to the
microprocessor. The PCI IRQ pins are typically connected to the PCI bus INT
A# ~ INT H# pins as follows:
Order 1 Order 2 Order 3 Order 4
PCI Slot 1 INT F# INT G# INT H# INT E#
PCI Slot 2 INT G# INT H# INT E# INT F#
PCI Slot 3 INT D# INT A# INT B# INT C#
LAN Controller INT H# INT E#
AGP Slot INT A# INT B#
1394 Controller INT H#
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