基于VHDL的异步串行通信电路设计　随着电子技术的发展，现场可编程门阵列FPGA和复杂可编程逻辑器件CPLD的出现，使得电子系统的设计者利用与器件相应的电子CAD软件，在实验室里就可以设计自己的专用集成电路ASIC器件。这种可编程ASIC不仅使设计的产品-VHDL-based asynchronous serial communication circuit design with the advent of electronic technology, field programmable gate array FPGA and CPLD Complex Programmable Logic Device emergence, the designers of electronic systems and devices using the corresponding electronic CAD software , in the laboratory can design their own application-specific integrated circuits ASIC devices. This not only makes the design of Programmable ASIC products