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Raven PCI Bridge ASIC

Then one of these bits is delivered to each Interrupt Selector. Since this interrupt source can be multicast, each of these IPR bits must be cleared separately when the vector is returned for that interrupt to a particular processor.

If one of the following sets of conditions is true, the interrupt pin for processor 0 is driven active.

Set1

The source ID in IRR_0 is from an external source.

The destination bit for processor 1 is a 0 for this interrupt.

The priority from IRR_0 is greater than the highest priority in ISR_0.

The priority from IRR_0 is greater than the contents of task register_0.

Set2

The source ID in IRR_0 is from an external source.

The destination bit for processor 1 is a 1 for this interrupt. The source ID in IRR_0 is not present is ISR_1.

The priority from IRR_0 is greater than the highest priority in ISR_0.

The priority from IRR_0 is greater than the Task Register_0 contents.

The contents of Task Register_0 is less than the contents of Task Register_1.

Set3

The source ID in IRR_0 is from an internal source.

The priority from IRR_0 is greater than the highest priority in ISR_0.

The priority from IRR_0 is greater than the Task Register_0 contents.

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Motorola MVME2300 Series manual Raven PCI Bridge Asic