5. SPECIFICATION
5-9
5.4 Interrupts list
Table 5-12 Interrupts list
Interrupt pin
Description
IRQ0
Cascade (from 8259 #1)
IRQ1
Not used
IRQ2
Timer
IRQ3
Serial port 2 (COM2)
IRQ4
Serial port 1 (COM1)
IRQ5
Not used
IRQ6
Not used
IRQ7
Not used
IRQ8
Real-time clock
IRQ9
SCI, SMBus
IRQ10
Not used
IRQ11
Not used
IRQ12
Not used
IRQ13
Coprocessor
IRQ14
Not used
IRQ15
Not used
IRQ16
PCI Express slot1, PCI Express slot2,
PCI slot6, SATA controller
IRQ17
PCI Express slot3, PCI slot7
IRQ18
PCI Express slot4
IRQ19
PCI slot5
IRQ20
Not used
IRQ21
Not used
IRQ22
Not used
IRQ23
Not used
MSI
xHCI, Onboard Video, Onboard LAN
< NOTE >
・
The above list is valid when the APIC is enabled.
・
The IRQ numbers of PCI slots are valid when the INT A terminal is used.
・
The IRQ numbers are fixed and you cannot change the settings shown above.
・
Even under APIC-capable OS, APIC-enabled IRQ numbers are assigned only
while the corresponding device is active. In other cases, APIC-disabled IRQ
numbers are assigned instead(see the next page).
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