Digital I/O board FPGA bitstream

This directory contains the source files used to generate the FPGA configuration bitstream uploaded by the tool to the system's digital I/O board (if present). A prebuilt copy of the bitstream is provided in the data directory, so recompiling it manually is not necessary in order to build the tool.

See doc/fpga.md for more details on the registers implemented by the bitstream as well as building instructions.