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I am programming a Microsemi M2Gl005 FPGA and wondering which type of reset I should use. I currently have an asynchronous reset implemented, but I wanted to make sure that the part didn't prefer a synchronous reset. I checked the datasheets and found not much mention of it. Any thoughts?

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This choice will depend a great deal on the application and use cases of the FPGA. Does it get reset only when first powered up or is it reset periodically during operation? Is the reset generated internal to the FPGA or externally? Can you synchronize the reset input when it enters the FPGA and then use it as an asynchronous reset?

It is important that you consider metastability when making this decision. If you have a truly asynchronous input to a synchronous design then metastability can happen.

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If I understand correctly you're not even sure why your reset was made asynchronous in the first place. You should probably look for an exact reason for that decision and if you don't find one, I'd advice you to prefer a synchronous reset.

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