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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 pins as follows:
DEVICE
Interrupt
ID Select
REQ / GNT
XGI Z7
PCI_PIRQ # 0
PCI_AD18
IT8213F
PCI_PIRQ # 2
PCI_AD19
PCI_REQ# 2 / PCI_GNT# 2
PCI Slot 1
PCI_PIRQ # 0
PCI_AD20
PCI_REQ# 0 / PCI_GNT# 0
PCI_PIRQ # 1
PCI_PIRQ # 2
PCI_PIRQ # 3
PCI Slot 2
PCI_PIRQ # 3
PCI_AD21
PCI_REQ# 1 / PCI_GNT# 1
PCI_PIRQ # 0
PCI_PIRQ # 1
PCI_PIRQ # 2
PCI Slot 3
PCI_PIRQ # 2
PCI_AD22
PCI_REQ# 3 / PCI_GNT# 3
PCI_PIRQ # 3
or
PCI_PIRQ # 0
ARBITER_REQ# 1
PCI_PIRQ # 1
ARBITER_GNT# 1
PCI Slot 4
PCI_PIRQ # 1
PCI_AD23
ARBITER_REQ# 2
PCI_PIRQ # 2
&
PCI_PIRQ # 3
ARBITER_GNT# 2
PCI_PIRQ # 0
Manual
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