Nios II Classic Processor Reference Guide

ID 683620
Date 10/28/2016
Document Table of Contents

4.3.4. 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 Nios II Embedded Design Suite (EDS) version 9.0 or higher. 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.