利用EDA的VHDL硬件描述语言设计的函数信号发生器，可以产生递增、递减斜波，三角波，阶梯波，正弦波，方波-The use of EDA, VHDL hardware descr iption language design function of the signal generator can generate increased progressively decreasing ramp, triangle wave, step-wave, sine wave, square wave