Category: External memory interface
tool:-
device:-


Since the EMIF IP issues a read command at the refresh timing and performs DQS tracking, the read command may be issued at a timing unintended by the user.
This behavior is normal for EMIF IP behavior.

It is also described in the following knowledge database, so please refer to it.
https://www.altera.com/support/support-resources/knowledge-base/solutions/rd11192012_232.html