Synchronous (latch mode) sequential circuit: The behavior can be defined from the knowledge of circuits that achieve synchronization by using a timing signal called the clock. Asynchronous (fundamental mode) sequential circuit: The behavior is dependent on the arrangement of the input signal that changes continuously over time, and the output can be changed at any time (clockless).Ĭlock Driven: Synchronous circuits that are synchronized to a specific clock signal. Sequential logic circuits are divided into three categories like following.Įvent-Driven: Asynchronous circuits that can change the state immediately when enabled.
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