Nios® V Processor Software Developer Handbook

ID 743810
Date 10/06/2025
Public
Document Table of Contents

9.2.3.2.4. Exception Dispatcher

The exceptions dispatcher checks for a registered hardware exception handler.
  • If an hardware exception handler is registered, the exception dispatcher calls it, then restores context and returns.
  • If no hardware exception handler is registered,
    • If processor debug module is enabled, the processor enters Debug Mode using the ebreak instruction. Allowing the debugger to take control.
    • If there is no debug module, the processor enters an infinite loop.
Figure 25. Exception Dispatcher

For more information on registering an hardware exception handler, refer to the Hardware Exception Handler chapter.

For more information about the RISCV-based processor EBREAK instruction, refer to the The RISC-V Instruction Set Manual in RISC-V International website.