Refer to Cyclone V device Overview, you can find that the difference between them is that, the 5CSEM device contains one Hard Memory Controller, and the 5CSEB does not contain Hard Memory Controller.
If there's currently no further requests, I am setting this question to resolved.
By the way, we would appreciate it if you can take a moment to fill in the satisfaction survey. Your feedback is valuable and helps us improve our support quality.
