DDS的FPGA实现(VHDL),只可调频，调幅可于外部DA实现。(内附三角波、正弦波、方波的rom调用)-DDS on FPGA (VHDL), only FM, AM can be implemented in an external DA. (With triangular wave, sine wave, square wave rom call)

波形发生器的源代码，有正弦波，三角波，锯齿波，方波。modelsim仿真，包含testbench仿真代码，testbench用的verilog编写，波形发生器源代码用的VHDL编写。-Waveform generator source code, sine, triangle, sawtooth, square wave. modelsim simulation, testbench simulation code contains, verilog write testbench use, w

vhdl语言编写的示波器，能够显示三角波，方波，锯齿波等波形，能够切换波形-vhdl language oscilloscope can display a triangular wave, square wave, sawtooth waveform, capable of switching waveform

基于FPGA方波频率测试仪，使用VHDL语言(Frequency tester based on FPGA square wave,Using the VHDL language)