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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
0(00h)
1(01h)
2(02h)
3(03h)
4(04h)
5(05h)
6(06h)
7(07h)
8(08h)
9(09h)
10(0Ah)
11(0Bh)
12(0Ch)
13(0Dh)
14(0Eh)
15(0Fh)
16(10h)
17(11h)
18(12h)
19(13h)
20(14h)
21(15h)
22(16h)
23(17h)
( ): Hexadecimal notation
Peripherals (Controller)
System timer
−
−
COM2 serial port
COM1 serial port
−
−
−
Realtime clock (RTC)
Microsoft ACPI-Compliant System (SCI)
−
Motherboard resources (BMC)
−
Numeric data processor
−
−
Onboard LAN1/3
PCI1C: INTB
PCI2C: INTA
Onboard LAN2/4
PCI1C: INTC
PCI2C: INTB
Onboard VGA/SMBus
PCI1C: INTD
PCI2C: INTC
Onboard SATA1/2
PCI1C: INTA
PCI2C: INTD
−
−
EHCI#2 (USB)
EHCI#1 (USB)
Express5800/R120e-2E User's Guide
IRQ/PIQR
Peripherals (Controller)
−
24(18h)
−
25(19h)
26(1Ah)
PCI1A: INTA
−
27(1Bh)
28(1Ch)
PCI1A: INTB
29(1Dh)
PCI1A: INTC
30(1Eh)
PCI1A: INTD
31(1Fh)
Primary IOAT
−
32(20h)
−
33(21h)
−
34(22h)
−
35(23h)
−
36(24h)
−
37(25h)
−
38(26h)
Primary IOAT
39(27h)
40(28h)
PCI1B: INTA
41(29h)
PCI2A: INTA
42(2Ah)
PCI3A: INTA
−
43(2Bh)
PCI1B: INTB
44(2Ch)
PCI2B: INTD
PCI3B: INTC
PCI1B: INTC
45(2Dh)
PCI2B: INTB
PCI3B: INTB
PCI1B: INTD
46(2Eh)
PCI2B: INTC
PCI3B: INTD
−
47(2Fh)
2. PCI Configuration
167
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