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It could probably be handled by the realtime cores on the BeagleBone Black's SoC, or perhaps by an XMOS part, but if someone already knows how to develop for FPGAs there's not much of an incentive to try to shoehorn the task onto a microcontroller.

Anything that involves reading from moderately-to-insanely fast ADCs is a natural FPGA application, especially if multiple channels are involved.

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I hear that. I'm working on multi-channel ADC hardware right now, and there is no way that we're going to use an FPGA (per unit cost).

At my last gig, we used FPGA's for several low-volume products.

One of the founders wrote a FPGA language. I suspect it's the tool the team knows the best, but may not be the most price optimized. I think that's fine for now, especially since it's still one of the most affordable arms available.

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