Intel SAI2 Product Specification - Page 24
Default I/O APIC, Extended I/O APIC
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SAI2 Server Board Architecture Overview SAI2 Server Board TPS 2.6.1 Default I/O APIC The CSB5 South Bridge integrates a 16-entry I/O APIC which is used to distribute 16 PCI interrupts. 2.6.2 Extended I/O APIC An additional 16-entry I/O APIC is integrated in the CSB5 South Bridge to distribute EISA/ISA interrupts. This additional I/O APIC is enabled only when the CSB5 South Bridge is configured to the Extended APIC configuration. 14 Revision 1.0
SAI2 Server Board Architecture Overview
SAI2 Server Board TPS
Revision 1.0
14
2.6.1
Default I/O APIC
The CSB5 South Bridge integrates a 16-entry I/O APIC which is used to distribute 16 PCI
interrupts.
2.6.2
Extended I/O APIC
An additional 16-entry I/O APIC is integrated in the CSB5 South Bridge to distribute EISA/ISA
interrupts. This additional I/O APIC is enabled only when the CSB5 South Bridge is configured
to the Extended APIC configuration.