Understanding Mealy and Moore Models in Digital Design
Explore the concepts of Mealy and Moore models in digital design, understanding how the outputs are determined by the present state and inputs. Learn the differences between the two models and their applications in circuit design.
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A x A+ Y 0 0 0 1 1 0 1 1
A B C A+ B+ C+ TA TB Tc 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1
A B C A+ B+ C+ Y JA KA JB KB Jc Kc 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1
Mealy and Moore Models The Mealy model: the outputs are functions of both the present state and inputs (Fig. 5-15). The outputs may change if the inputs change during the clock pulse period. The outputs may have momentary false values unless the inputs are synchronized with the clocks. The Moore model: the outputs are functions of the present state only (Fig. 5-20). The outputs are synchronized with the clocks.
Mealy and Moore Models Mealy Moore Present State A B 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 Next StateO/P A B 0 0 0 1 0 0 1 1 0 0 1 0 0 0 1 0 Present State A B 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 Next StateO/P A B 0 0 0 1 0 1 1 0 1 0 1 1 1 1 0 0 I/P I/P x 0 1 0 1 0 1 0 1 y 0 0 1 0 1 0 1 0 x 0 1 0 1 0 1 0 1 y 0 0 0 0 0 0 1 1 For the same state, the output does not change with the input For the same state, the output changes with the input
Moore State Diagram State / Output 0 0 1 0 0 / 0 0 1 / 0 1 1 1 1 / 1 1 0 / 0 1 0 0
