No, we are using Microchip Polarfire series flash based fpga chips, new product this year.
This is only our first prototype, we can add a tiny PCIe to the final product. but it will add a small design risk for the change, and i'd like to know how many customers may ask for it? and for what usage? thanks.
So which chip are you using?
You mention 28nm so I'm guessing Xilinx 7-series?
Perhaps the Artix7-200T?
The hashrates seems reasonable for that at least.
Is USB the only communication interface with the host?
Seems a bit limiting to only have that as interface.