Intel: Is it possible to debug Nios II behavior with SignalTap II?

Nios II

Yes. It is possible.
 
For details, please refer to the application note published at the following URL link,
AN 446 "Debugging Nios II Systems with the SignalTap II Embedded Logic Analyzer"
Please refer to
 
  https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an446.pdf (English)
  https://www.intel.co.jp/content/dam/altera-www/global/ja_JP/pdfs/literature/an/an446_j.pdf (Japanese)
  

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