corresponding PCI Express Port is disabled.
8.6 PCI Interrupt Routing Map
Table 42
PCI Interrupt Routing Map
PIRQ
PCI BUS
INT Line ¹
APIC Mode
IRQ
VGA
Azalia
HDA
UHCI 0
UHCI 1
UHCI 2
EHCI
PATA
Native
SM
Bus
AC97
A
16
x
x
B
17
x
C
18
x
x
D
19
x
x
E
INTD
20
F
INTA
21
G
INTB
22
H
INTC
23
x
x
Table 43
PCI Interrupt Routing Map (continued)
PIRQ LAN
SATA
Native
PCI-EX Root
Port 0
PCI-EX Root
Port 1
PCI-EX Root
Port 2
PCI-EX Root
Port 3
PCI-EX
Port 0
PCI-EX
Port 1
PCI-EX
Port 2
PCI-EX
Port 3
A
x
x ²
x ³
x
4
x
5
B
x
x
x ³
x
4
x
5
x ²
C
x
x
4
x
5
x ²
x ³
D
x
x
5
x ²
x ³
x
4
E
x
F
G
H
Notes
¹ These interrupts are available for external devices/slots on the X1 connector.
² Interrupt used by single function PCI Express devices (INTA).
³ Interrupt used by multifunction PCI Express devices (INTB).
4
Interrupt used by multifunction PCI Express devices (INTC).
5
Interrupt used by multifunction PCI Express devices (INTD).
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