Nios® II Processor Reference Guide

ID 683836
Date 8/28/2023
Document Table of Contents
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4.7.2. Interrupt Controller Interfaces

The Interrupt controller setting determines which of the following configurations is implemented:

  • Internal interrupt controller
  • External interrupt controller (EIC) interface

The EIC interface is available only on the Nios® II/f core.

Note: When the EIC interface and shadow register sets are implemented on the Nios® II core, you must ensure that your software is built with the latest Nios® II Embedded Design Suite (EDS) version. Earlier versions have an implementation of the eret instruction that is incompatible with shadow register sets.

For details about the EIC interface, refer to “Exception Processing” in the Programming Model chapter of the Nios® II Processor Reference Handbook.