quartus timing problems

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quartus timing problems

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dear all :

i have some questions when i Compile the project，my software is quartus 16.0 standard

After compiling my project, I encountered some issues with timing alarms, as shown below

As the picture shows，the setup summary and the hold summary is not alarm,but the report ddr options is alarm and doesn't have any sequential path display，i don't know how to solve this problem。

please help me

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