mealy and moore models
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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A x A+ Y
0 0
0 1
1 0
1 1
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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
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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
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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.
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Present State I/P Next
State O/P
A B x A B y0 0 0 0 0 00 0 1 0 1 00 1 0 0 0 10 1 1 1 1 01 0 0 0 0 11 0 1 1 0 01 1 0 0 0 11 1 1 1 0 0
Mealy
For the same state,the output changes with the input
Present State I/P Next
State O/P
A B x A B y0 0 0 0 0 00 0 1 0 1 00 1 0 0 1 00 1 1 1 0 01 0 0 1 0 01 0 1 1 1 01 1 0 1 1 11 1 1 0 0 1
Moore
For the same state,the output does not change with the input
Mealy and Moore Models
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Moore State Diagram
State / Output
0 0 / 0 0 1 / 0
1 1 / 1 1 0 / 0
0
1
1
1
00
01