Why do I see "Error (19115): Response compare size mismatched " when I examine the serial FLASH attached to Stratix 10 when using Quartus Programmer 18.0? - Why do I see "Error (19115): Response compare size mismatched " when I examine the serial FLASH attached to Stratix 10 when using Quartus Programmer 18.0? Description You may encounter intermittent failure when examine the Stratix ®10 serial FLASH content by Quartus programmer® 18.0, error message would be like: Error (19115): Response compare size mismatched Error (209012): Operation failed Fix/Workaround The failure rate would be less than 30%, you could retry the examine process. This issue would be fixed in further Quartus version. Custom Fields values: ['novalue'] Troubleshooting FB: 556655; False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 18.0.1 18.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']