用VHDL语言对方波信号进行2FSK调制与解调，包括仿真图及程序。-VHDL language 2FSK each wave signal modulation and demodulation, including simulation diagram and procedures.

使用fpga达成的最短脉冲检测、窄脉冲成型模块程序，语言为vhdl，可用于ppm调制与解调项目设计(The program of the shortest pulse detection based on FPGA is VHDL, which can be used in PPM modulation and demodulation project design)