Nios® II Processor Reference Guide

ID 683836
Date 10/22/2020
Public
Document Table of Contents

3.4.2.10.8. The D Flag

The D flag indicates whether the exception is an instruction access exception or a data access exception. During a general exception, the processor sets D to one when the exception is related to a data access, and clears D to zero for all other nonbreak exceptions.

The following exceptions set the D flag to one:

  • Fast TLB miss (data)
  • Double TLB miss (data)
  • TLB permission violation (read or write)
  • Misaligned data address
  • Supervisor-only data address

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