A SERVICE OF

logo

4-11
System Resources
PCI Configuration
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 MCP1 INT Pin IDSEL CLOCK REQ# / GNT#
PCI Slot PIRQA AD17 PCICLK 0 REQ#0 / GNT#0
Mini PCI Slot PIRQB AD18 PCICLK 1 REQ#1 / GNT#1
LAN1 PIRQC AD21 CLKLAN 1 REQ#2 / GNT#2
LAN2 PIRQD AD22 CLKLAN 2 REQ#3 / GNT#3
PDF created with pdfFactory Pro trial version www.pdffactory.com