2. PCI Configuration
Express5800/R120d-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