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What are synchronous sequential circuit?
In digital electronics, a synchronous circuit is a digital circuit in which the changes in the state of memory elements are synchronized by a clock signal. In a sequential digital logic circuit, data are stored in memory devices called flip-flops or latches. Exceptions are often compared to fully synchronous circuits.
How do you analyze a synchronous sequential circuit?
The analysis of synchronous sequential logic circuits is facilitated by the use of state tables which consist of three vertical sections labeled present state, flip flop inputs, and next state. The present state represents the state of each flip flop before the occurrence of a clock pulse.
What are the steps in designing a synchronous circuit?
Design steps: 1. Obtain the specification of the desired circuit. 2. Derive a state diagram. 3. Derive the corresponding state table. 4. Reduce the number of states if possible. 5. Decide on the number of state variables. 6. Choose the type of flip-flops to be used.
Which is an example of a sequential circuit?
This example is taken from M. M. Mano, Digital Design, Prentice Hall, 1984, p.235. Example 1.3 We wish to design a synchronous sequential circuit whose state diagram is shown in Figure 13. The type of flip-flop to be use is J-K. Figure 13.
How are sequential circuits different from combinational logic?
In contrast to a combinational logic, which is fully specified by a truth table, a sequential circuit requires a state table for its specification. The first step in the design of sequential circuits is to obtain a state table or an equivalence representation, such as a state diagram.
How are states copied in a sequential circuit?
In Table 10 we find that a transition of states from 0 to 0 requires that input J = 0 and input K = X. So 0 and X are copied in the first row under J 0 and K 0 respectively.