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.
cussed in Section 14.2. In both cases we compute a next state based on current state and input. What’s different is the dynamics of how the current state is updated with the next state. Without a clocked state register, the state of an asynchronous sequential circuit may change at any time (asynchronously).
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