Nios® II Processor Reference Guide

ID 683836
Date 8/28/2023
Document Table of Contents

3.9.8. Custom Instructions

The custom instruction provides low-level access to custom instruction logic. The inclusion of custom instructions is specified with the Nios® II Processor parameter editor in Platform Designer, and the function implemented by custom instruction logic is design dependent.

For more information, refer to the “Custom Instructions” section of the Processor Architecture chapter of the Nios® II Processor Reference Handbook

For continued more information refer to the Nios II Custom Instruction User Guide.

Machine-generated C functions and assembly language macros provide access to custom instructions, and hide implementation details from the user. Therefore, most software developers never use the custom assembly language instruction directly.