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82093AA

I/O ADVANCED PROGRAMMABLE INTERRUPT CONTROLLER (IOAPIC)

Intel 

82093AA (IOAPIC)

E

NMI

LINTIN1

LINTIN0

Processor

Local APIC

RESET

LINTIN0 LINTIN1 SMI#

Host-to-PCI

Bridge

API CACK 2#

PCI Bus

Processor

RESET

Local APIC

LINTIN0 LINTIN1 SMI#

SMI

RESET

APIC Bus

RESET

SMIOUT#

MIRQ[1:0]

PIIX3

CS#

APICREQ#

APICACK1#

INTIN23/SMI#

INTR

IRQ[1,2:7,8#,9:12,14,15]

I/O APIC Unit

INTIN[2,13,22]

MIRQ[1:0]

ISA Bus

Figure 2. I/O And Local APIC Units

APIC_SYS

4

PRELIMINARY

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