we have made a A3P250 FPGA board, with build-in USB interface, total cost of building the board is less than $50, can do a ton of things MCU can not do. would anyone want it if we commercialize it?
http://cdn.shopify.com/s/files/1/0117/1482/products/IMG_0305...
The design was based on
http://skywired.net/blog/projects/a3pn250-fpga-breakout-boar..., added regulator chips, got rid of the power-on-reset chips.