用VHDL编写的oscillograph数字部分源代码，在Altera FPGA上跑通。直接把模拟部分输入输出AD，DA信号接入本模块即可。-Digital oscillograph with the written part of the VHDL source code, in the Altera FPGA on the run-pass. Directly to the analog input and output AD, DA signal can access this modul