2. PCI Configuration
Express5800/R120e-2E 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: INTB
PCI2C: INTA
40(28h) PCI1B:
INTA
17(11h)
Onboard LAN2/4
PCI1C: INTC
PCI2C: INTB
41(29h) PCI2A:
INTA
18(12h)
Onboard VGA/SMBus
PCI1C: INTD
PCI2C: INTC
42(2Ah) PCI3A:
INTA
19(13h)
Onboard SATA1/2
PCI1C: INTA
PCI2C: INTD
43(2Bh)
−
20(14h)
−
44(2Ch)
PCI1B: INTB
PCI2B: INTD
PCI3B: INTC
21(15h)
−
45(2Dh)
PCI1B: INTC
PCI2B: INTB
PCI3B: INTB
22(16h)
EHCI#2 (USB)
46(2Eh)
PCI1B: INTD
PCI2B: INTC
PCI3B: INTD
23(17h)
EHCI#1 (USB)
47(2Fh)
−
( ): Hexadecimal notation