D触发器的置位和清零(S,C)端是以电平方式工作的。图所示电路,可以用信号的变化,使D触发器置位或清零。本例中D触发器IC_(1A),产生一个正跳变输出,表示缓冲器满。外部信号XFERIN及XFER OUT分别表示装入不装入(图中未标出)。但这两个信号不能直接控制D触发器IC_(1A)的状态,按图所示在电路中加入另一个D触发器IC_(1B)后,XFER IN由低电平到高电平跳变 D flip-flop set and clear (S, C) side is to work level. Circuit shown in Figure, you can use the signal changes, so that D flip-flop set or cleared. In this example, D flip-flop IC_ (1A) produces a positive transition output, indicating that the buffer is full. The external signals XFERIN and XFER OUT indicate that the load is not loaded (not shown). However, the two signals can not directly control the state of the D flip-flop IC_ (1A). After the other D flip-flop IC_ (1B) is added to the circuit as shown, the XFER IN transitions from low level to high level