基于UART的VHDL程序，包括顶层程序、波特率发生器程序、UART发送器程序、UART接收器程序4部分程序。有详细注释，并在每个程序后附上一张仿真波形图，便于理解和验证。-UART in VHDL-based procedures, including the top-level procedures, procedures for the baud rate generator, UART transmitter program, UART receiver program four part of the program. Detailed notes, and attached to each program a simulation waveform diagram, easy to understand and verify.