Due to a problem in the Quartus® Prime software version 17.0 and earlier, the 50G Ethernet IP core will lose word lock after receiving 16 incorrect frame headers in a window length of 64 frame headers. The Ethernet specification states that this should only happen after 65 incorrect frame headers in a window length of 1024 frame headers.
Device Family: Intel® Arria® 10 GT
Type: Answers, Errata
Area: Intellectual Property
Last Modified: May 18, 2017
Version Found: v16.0
Bug ID: FB: 420044;
IP: 25G 50G Ethernet
This problem is scheduled to be fixed in a future release of the Quartus Prime software.