Transcription of Asynchronous Sequential Circuits - Stanford University
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Asynchronous Sequential Circuits - Stanford University
Chapter 22. Asynchronous Sequential Circuits Asynchronous Sequential Circuits have state that is not synchronized with a clock. Like the synchronous Sequential Circuits we have studied up to this point they are realized by adding state feedback to combinational logic that imple- ments a next-state function. Unlike synchronous Circuits , the state variables of an Asynchronous Sequential circuit may change at any point in time. This Asynchronous state update from next state to current state complicates the design process. We must be concerned with hazards in the next state function, as a momentary glitch may result in an incorrect nal state. We must also be concerned with races between state variables on transitions between states whose encodings di er in more than one variable.
386 EE108A Class Notes state doesn’t change anything. If the next state is different than the current state, this state is transient since as soon as the current state is updated with the next state, the circuit will change states. For example, suppose the circuit has inputs ab = 00 and the current state is 0.
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