User's Guide

2. PCI Configuration
Express5800/R120d-1E User’s Guide
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Chapter 4 Appendix
Interrupt Request
Interrupt requests are assigned as shown below. Find an appropriate one to install a PCI card.
"PCI1A: INTA" denotes INTA of PCI card installed in PCI slot 1A.
If the operating system and device driver support MSI/MSI-X (Message Signaled Interrupts), assignments
differ from those shown in the table below.
IRQ/PIRQ Peripherals (Controller) IRQ/PIQR Peripherals (Controller)
0(00h) System timer 24(18h) –
1(01h) – 25(19h) –
2(02h) – 26(1Ah) PCI1A: INTA
3(03h) COM2 serial port 27(1Bh) –
4(04h) COM1 serial port 28(1Ch) PCI1A: INTB
5(05h) – 29(1Dh) PCI1A: INTC
6(06h) – 30(1Eh) PCI1A: INTD
7(07h) – 31(1Fh) Primary IOAT
8(08h) Realtime clock (RTC) 32(20h) –
9(09h)
Microsoft ACPI-Compliant System
(SCI)
33(21h)
–
10(0Ah) – 34(22h) –
11(0Bh) Motherboard resources (BMC) 35(23h) –
12(0Ch)
–
36(24h)
–
13(0Dh) Numeric data processor 37(25h) –
14(0Eh) – 38(26h) –
15(0Fh) – 39(27h) Primary IOAT
16(10h)
Onboard LAN1/3
PCI1C: INTA
40(28h) PCI1B: INTA
17(11h)
Onboard LAN2/4
PCI1C: INTB
41(29h)
－
18(12h)
Onboard VGA/SMBus
PCI1C: INTC
42(2Ah)
－
19(13h)
Onboard SATA1/2
PCI1C: INTD
43(2Bh)
－
20(14h) – 44(2Ch) PCI1B: INTB
21(15h) – 45(2Dh) PCI1B: INTC
22(16h) EHCI#2 (USB) 46(2Eh) PCI1B: INTD
23(17h) EHCI#1 (USB) 47(2Fh) –
( ): Hexadecimal notation