![]() The following table shows the characteristic table of SR flip-flop. So, SR flip-flop can be used for one of these three functions such as Hold, Reset & Set based on the input conditions, when positive transition of clock signal is applied. Here, Q(t) & Q(t + 1) are present state & next state respectively. The following table shows the state table of SR flip-flop. But, this flip-flop affects the outputs only when positive transition of the clock signal is applied instead of active enable. The operation of SR flipflop is similar to SR Latch. This circuit has two inputs S & R and two outputs Q(t) & Q(t)’. The circuit diagram of SR flip-flop is shown in the following figure. Whereas, SR latch operates with enable signal. SR flip-flop operates with only positive clock transitions or negative clock transitions. In this chapter, let us discuss the following flip-flops using second method. In second method, we can directly implement the flip-flop, which is edge sensitive. So that the combination of these two latches become a flip-flop. ![]() ![]() In first method, cascade two latches in such a way that the first latch is enabled for every positive clock pulse and second latch is enabled for every negative clock pulse. We can implement flip-flops in two methods. Those are the basic building blocks of flip-flops. In previous chapter, we discussed about Latches.
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