An asynchronous circuit has two SR latches (not edge-triggered FF) denoted SR1 and SR2, and two external inputs x1 and x2. It also has a single output z. The excitation expressions for the inputs and output equations are: S1 = *1Q2 R1 = *1Q2 R2 = 182 + 1Qı = Q1Q2 + *1Q2 S2 = 182Q1 Using the characteristic equation for an SR latch, draw the excitation table. Then draw the state table, flow table, and flow diagram. (Hint: follow the same steps as in the notes)

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Latches and Flip Flop

Just like logic gates, the latches and flip-flops are the important elements of an electronic circuit. The logic gates form the important part of combinatorial circuits, while the latches and flip-flops form the essential part of a sequential circuit. Sequential circuits form the important concept of automata theory in electronics and electrical engineering, these circuits are a kind of logic circuit whose output depends on both present input and past inputs, that is, the input history.