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Chapter 9 Asynchronous Sequential Logic

19-1 Chapter 9 AsynchronousSequential Logic9-2 Outline Asynchronous Sequential Circuits Analysis Procedure Circuits with Latches Design Procedure Reduction of State and Flow Tables Race-Free State Assignment Hazards Design Example29-3 Sequential Circuits Consist of a combinational circuit to which storage elements are connected to form a feedback path Specified by a time sequence of inputs, outputs, and internal states Two types of Sequential circuits: Synchronous Asynchronousprimary difference9-4 Synchronous vs. Asynchronous Asynchronous Sequential circuits Internal states can change at any instantof time when there is a change in the input variables No clocksignal is required Have better performance but hard to design due to timing problems Synchronous Sequential circuits Synchronized by a periodictrain of clock pulses Much easier to design(preferred design style)39-5 Why Asynchronous Circuits ?

Implementation Procedure Procedure to implement an asynchronous sequential circuits with SR latches: 1. Given a transition table that specifies the excitation function Y = Y 1Y 2…Y k, derive a pair of maps for each S i and R i using the latch excitation table 2. Derive the Boolean functions for each S i and R i

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