Chapter 9 Asynchronous Sequential Logic
19-1Chapter 9AsynchronousSequential Logic9-2Outline Asynchronous Sequential Circuits Analysis Procedure Circuits with Latches Design Procedure Reduction of State and Flow Tables Race-Free State Assignment Hazards Design Example29-3Sequential 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 difference9-4Synchronous 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)39-5Why Asynchronous Circuits ? Used when speed of operation is important Response quickly without waiting for a clock pulse Used in small independent systems Only a few components are required Used when the input signals may change independently of internal clock Asynchronous in nature Used in the communication between two units that have their own independent clocks Must be done in an Asynchronous fashion9-6Definitions of Asyn.
2 9-3 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 Asynchronous primary difference 9-4 Synchronous vs. Asynchronous Asynchronous sequential circuits Internal states can change at …
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