Question

请教一道电工学的数字电路问题,

Answer 1

Q1 = Q2 = 0 ,波形是低电平的直线.

初始状态为零,则：

Q1 = Q2 = 0 ,Q'1 = Q'2 = 1 ,R1 = Q'2 = 1 ,D2 = Q1 = 0 .

时钟时刻：

R1 = 1 ,Q1 = 0 ；D2 = 0 ,Q2 = 0 .

可见时钟到来没有改变触发器状态 .