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Sequential Logic Implementation

CS 150 - Fall 2005 Lec #7: Sequential Implementation 1 Sequential Logic Implementation Models for representing Sequential circuits Abstraction of Sequential elements finite state machines and their state diagrams Inputs/outputs Mealy, Moore, and synchronous Mealy machines finite state machine design procedure Verilog specification Deriving state diagram Deriving state transition table Determining next state and output functions Implementing combinational logicCS 150 - Fall 2005 Lec #7: Sequential Implementation 2react right away to leaving the wallMealy vs. Moore Machines Moore: outputs depend on current state only Mealy: outputs depend on current state and inputs Ant brain is a Moore machine Output does not react immediately to input change We could have specified a Mealy FSM Outputs have immediate reaction to inputs As inputs change, so does next state, doesn t commit untilclocking eventAL R / TR, FL / TLL R / TL, FCS 150 - Fall 2005 Lec #7: Sequential Implementation 3D/1E/1B/0A/0C/01000011110resetcurrentne xtresetinputstatestateoutput1 A00AB001AC000BB001BD000CE001CC000DE101DC 100EB101ED1 Specifying Outputs for a Moore machine Output is only function of state Specify in state bubble i

Finite state machines and their state diagrams Inputs/outputs Mealy, Moore, and synchronous Mealy machines Finite state machine design procedure Verilog specification Deriving state diagram Deriving state transition table Determining next state and output functions Implementing combinational logic

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  States, Design, Implementation, Machine, Logic, Finite, Sequential, Finite state machine design, Finite state, Sequential logic implementation

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