UART 16550 core for MIPSfpga+ system AHB-Lite bus.
TODO:
- standalone work in simulator
- work as a part of MIPSfpga+ [in simulator] (https://github.com/zhelnio/mipsfpga-plus/tree/de10_lite)
- work as a part of MIPSfpga+ [on hardware] (https://github.com/zhelnio/mipsfpga-plus/tree/de10_lite) (Terasic de10-lite board)
- merge to [MIPSfpga+ repository] (https://github.com/MIPSfpga/mipsfpga-plus)