Motorola MVME2400 Series Manuel de service Page 113

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Multi-Processor Interrupt Controller (MPIC) Functional Description
http://www.mcg.mot.com/literature 2-55
2
In the distributed delivery mode, the interrupt is pointed to one or more
processors but it will be delivered to only one processor. Therefore, for
externally sourced or I/O interrupts, multicast delivery is not
supported.The interrupt is delivered to a processor when the priority of the
interrupt is greater than the priority contained in the task register for that
processor, and when the priority of the interrupt is greater than any
interrupt which is in-service for that processor, and when the priority of
that interrupt is the highest of all interrupts pending for that processor, and
when that interrupt is not in-service for the other processor. If both
destination bits are set for each processor, the interrupt will be delivered to
the processor that has a lower task register priority. Note, due to a deadlock
condition that can occur when the task register priorities for each processor
are the same and both processors are targeted for interrupt delivery, the
interrupt will be delivered to processor 0 or processor 1 as determined by
the TIE mode. Additionally, If priorities are set the same for competing
interrupts, external int. 0 is given the highest priority in hardware followed
by external int.1 through 15 and then followed by timer 0 through timer 3
and followed by IPI 0 and 1. For example, if both ext0 and ext1 interrupts
are pending with the same assigned priority; during the following interrupt
acknowledge cycles, the first vector returned shall be that of ext0 and then
ext1. This is an arbitrary choice.
Block Diagram Description
The description of the block diagram shown in Figure 2-9 focuses on the
theory of operation for the interrupt delivery logic. If the preceding section
is a satisfactory description of the interrupt delivery modes and the reader
is not interested in the logic implementation, this section can be skipped.
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