高手写的VHDL源码，实现DDS跳频器功能 请大家多提意见-experts write VHDL source code, the frequency-hopping DDS functionality Please speak up

曼彻斯特编码技术用电压的变化表示0和1。规定在每个码元中间发生跳变。高→ 低的跳变表示0，低→ 高的跳变表示为1。每个码元中间都要发生跳变，接收端可将此变化提取出来作为同步信号，使接收端的时钟与发送设备的时钟保持一致-Manchester coding techniques that use voltage changes in 0 and 1. Provisions in the middle of each symbol hopping happen. High → low hopping

扩跳频通信在QUARTUS7.0开发环境下的VHDL源程序及总体框图实现-Frequency-hopping communication QUARTUS7.0 expanded development environment in the VHDL source code and the achievement of the overall block diagram