MSI E7230 Master Series, User Manual

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Hardware Setup
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 ICH INT Pin IDSEL CLOCK REQ / GNT
PCI Slot 1 INT# F/G/H/E AD21 CK_PCI 0 REQ#1/ GNT#1
PCI Slot 2 INT# G/H/E/F AD22 CK_PCI 1 REQ#2/ GNT#2
PCI Slot 3 INT# H/E/F/G AD23 CK_PCI 2 REQ#3/ GNT#3
VGA INT# A AD16 CK_VGA REQ#0/ GNT#0