Sequential Circuits

May 14th, 2015
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-4.2 The circuit whose outputs and next state depend on both the input signals and the present state of the circuit. 4.2 Flip-Flops 4.3 Design of Sequential Circuits : Algorithm : Obtain the description of circuit and create the State Diagram Determine the State Table

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04 Sequential CircuitsEE201:Digital Circuits and SystemsSection 4 Sequential Circuits4.1 Overview of Sequential Circuits:DefinitionThe circuit whose outputs and next state depend on both the input signals and the present state of the circuitPrinciple [spot the error!]4.2 Flip-FlopsSR Flip-FlopJK Flip-FlopD Flip-FlopT Flip-Flop4.3 Design of Sequential CircuitsAlgorithm:Obtain the description of circuit and create the State Diagram Determine the State TableMinimize the number of statesAssign binary codes to each state Determine the number of flip-flops needed and give a letter symbol to each of them Choose the type of flip-flopsStarting from State Table, derive the Excitation Table and the Output Table Derive the minimized circuit output functions and flip-flop input functions Draw the Logic Diagram4.4 Example of DesignDesign a sequential logic circuit whose output Z is 1 except when the input X = 1 for at least four clock periods. Then the output Z is 0. Use J-K flip-flops. State Diagram [X/Z]State CodingPresent StateCodeA00B01C10D11Flip FlopsWe require two JK flip-flops. Lets name them JKA and JKBState TablePresentStateNext StateOutput ZX=0X=1X=0X=1AAB11BAC11CAD11DAD10Excitation TableQAQBXQAQBJAKAJBKBZ000000x0x1001010x1x1010000xx11011101xx1110000x10x110111x01x111000x1x1111111x0x00

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