If I want to control DDRx refresh at the user's arbitrary timing, are there any other signals that should be controlled other than refresh_req?

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Is there any signal other than refresh_req that should be controlled when controlling DDRx refresh at the user's own timing?

Category: External memory interface
tool:-
Device: Cyclone® V

Control of the refresh_chip signal is required.
Assert refresh_chip at the same time as refresh_req.

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