指定同步复位时， always的敏感表中仅有时钟沿信号，仅仅当时钟沿采到同步复位的有效电平时，才会在时钟沿到达时刻进行复位操作-Specifies synchronous reset, always sensitive to the table is just a clock edge signal only when the clock along to pick active level synchronous reset, the clock edge arrival time will