AP-732: I/O APIC Emulation Software for the i960(R) RP Microprocessor

This application note describes how to program the I/O APIC (Advanced Peripheral Interrupt Controller) port integrated on the i960(r) RP microprocessor. The i960 RP processor provides a hardware port that requires emulation software to achieve full I/O APIC functionality.

The APIC is based on a distributed architecture in which interrupt control functions are distributed between two basic functional units, the local unit and the I/O unit. The local and I/O units communicate through a bus - the APIC bus. In a multiprocessor system, multiple local and I/O APIC units operate together as a single entity, communicating via the 3-wire APIC bus. The APIC units are collectively responsible for delivering interrupts from sources to interrupt destinations throughout the multiprocessor system.

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