Nios® II Processor Reference Guide

ID 683836
Date 8/28/2023
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3.7.6.1.5. Shadow Register Sets

Although shadow register sets can be implemented independently of the EIC interface, typically the two features are used together. Combining shadow register sets with an appropriate EIC, you can minimize or eliminate the context switch overhead for critical interrupts.

For the best interrupt performance, assign a dedicated register set to each of the most time-critical interrupts. Less-critical interrupts can share register sets, provided the ISRs are protected from register corruption as noted in the Requested Register Set section of this chapter.

The method for mapping interrupts to register sets is specific to the particular EIC implementation.