5b_State_Machine_Models_Slides

# The general model for the mealy machine shows a state

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The general model for the Mealy machine shows a state machine whose outputs are combinational ft i f t h tt d f th functions of the state and of the inputs . The general model for the Moore machine shows a state machine whose outputs are combinational functions of the state onl functions of the state only .

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The Mealy Machine Model x m Combinational z n z 1 x 1 …… Logic y 1 + y 1 y r + y r (flip-flops) y i + = f i (x 1 ,…,x m ,y 1 ,…y r ) z i = g i (x 1 ,…,x m ,y 1 ,…y r )
The Mealy Machine Model x z = xy 1 y 2 +5V S J C K R Q Q y 1 +5V CLOCK' y 1 ' RESET' S J C K R Q Q y 2 ' y 2 AABABDABDCC C CLOCK' x STATE OUTPUT

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The Moore Machine Model y 1 + y 1 z 1 x m x 1 Combinational Logic Combinational Logic y r + y r z n (flip-flops) y i + = f i (x 1 ,…,x m ,y 1 ,…y r ) z = g (y 1 ,…y ) i i r
The Moore Machine Model x z = y 1 ’y 2 y 3 J C K Q Q 0 y 1 CLOCK' y 1 ' R J C K R Q Q y 2 ' CLEAR' y 2 S J C K R Q Q y 3 y 3 ' AABABCABCDH H CLOCK' x STATE OUTPUT

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Comparing the Model Comparing the Models Mealy Moore Definition The output is a function of the inputs and the states.
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• Summer '06
• JSThweatt
• Moore machine, Synchronous circuit, Machine Model Model

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