verilog实现AD6643芯片的驱动，用200MHz采样率对A、B两路信号进行采样，可以在chipscope中观察到A路和B路的数字信号，已验证程序正确可用。-Implemented in verilog language AD6643 chip driver with 200MHz sampling rate of A, B two-way signals are sampled can be observed A and B road in chipscope digital signa