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The state changes of most sequential circuits occur at times specified by a free-running clock signal.the train of pulses are called clock pulses.the device that generates these pulses are called clock and.One way of achieving this goal is to use pulses of limited duration throughout the system.
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A synchronous sequential circuit, by definition, must employ signals that affect the memory elements only at discrete instants of time.Q(t+1), referred to as the next state after application of a single pulse at the clock input.Q is an abbreviation of Q(t), referred to as the present state.Propagation delay of these gates provide the needed memory, thereby creating sequential-circuit building blocks such as latches and flip-flops that are used in higher-level designs. An asynchronous sequential circuit uses ordinary gates and feedback loops.The behaviour of an asynchronous sequential circuit depends upon the order in which its input signals change and can be affected at any instant of time.A synchronous sequential circuit is a system whose behaviour can be defined from the knowledge of its signals at discrete instants of time.their classification depends on the timing of their signals.There are two main types of sequential circuits:.The behaviour of such a circuit may be described by a state table that specifies its output and next state as functions of its current state and input.A circuit with memory, whose outputs depend on the current input and the sequence of past inputs, is called a sequential circuit.As a result, the circuit must “remember” something about the past.
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