Transcription of Chapter 9 Asynchronous Sequential Logic
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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
3 9-5 Why 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
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