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LECTURE #16: Moore & Mealy Machines - University of Florida

University of Florida Joel D. Schipper ECE Department Summer 2007 Page 1 of 8 LECTURE #16: Moore & Mealy Machines EEL 3701: Digital Logic and Computer Systems Based on LECTURE notes by Dr. Eric M. Schwartz Sequential design Review: - A binary number can represent 2n states , where n is the number of bits. - The number of bits required is determined by the number of states . Ex. 4 states requires 2 bits (22 = 4 possible states ) Ex. 19 states requires 5 bits (25 = 32 possible states ) - One flip-flop is required per state bit. Steps to design Sequential Circuits: 1) Draw a State Diagram 2) Make a Next State Truth Table (NSTT) 3) Pick Flip-Flop type 4) Add Flip-Flop inputs to NSTT using Flip-Flop excitation equation (This creates an Excitation Table.

GENERIC MEALY STATE MACHINE Example: Design a sequence detector that searches for a series of binary inputs to satisfy the pattern 01[0*]1, where [0*] is any number of consecutive zeroes. The output (Z) should become true every time the sequence is found. 1) Draw a State Diagram (Mealy) and then assign binary State Identifiers.

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