Premio Computer Aries/Centella manual PCI Interrupt Request Routing

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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