Lecture8_9Updated-04152010

Lecture8_9Updated-04152010 - Sequential Circuit Design...

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Sequential Circuit Design ead: 7.4, 7.5 Read: 7.4, 7.5
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Overview • Read carefully and understand well the problem specifications (and clarify some ambiguity) • Mealy machine or Moore machine? • Follow the 9-step design approach in the textbook
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Mealy Machine XY Z X Z Outputs are a function of C.S. and inputs Outputs are associated with transition end to give the fewest states necessary a b Tend to give the fewest states necessary Can cause problems when the inputs are asynchronous c Y XY Z
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Moore Machine •O u t puts are a function of C.S. XY X p Outputs are associated with state Tend to have more states utput change only with a state change a d Z b Output change only with a state change – do not rely on asynchronous inputs Output-coded state assignment c Y XY
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9-Step Approach Step 1: State/output table or diagram tep 2: Minimize # of states if possible State/output diagram Step 2: Minimize # of states if possible Step 3: State variable assignment Step 4: Transition/output table State/Output ble Analysis Step 5: Choose a f/f type Step 6: Excitation table table steps Step 7: Excitation equations Step 8: Output equations tep 9: Draw a logic diagram Excitation/Output equations Step 9: Draw a logic diagram
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Problem Statement • Design a synchronous state-machine with one input X and an output Z. Whenever the input sequence consists of two consecutive 0’s followed by two consecutive 1’s or vice versa, the output will be 1. Otherwise, the output will be 0.
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roblem Interpretation
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This note was uploaded on 11/15/2010 for the course ECE 561 taught by Professor Orin,d during the Spring '08 term at Ohio State.

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Lecture8_9Updated-04152010 - Sequential Circuit Design...

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