S+ n. The output (Z) should become true every time the sequence is found) Draw a State Diagram (Mealy) and then assign binary State Identifiers – Moore: outputs = f(state)only – Mealy outputs = f(state and input) – Mealy outputs generally occur one cycle earlier than a Moore: Compared to a Moore FSM, a Mealy FSM might – Be more difficult to conceptualize and design – Have fewer states P L State Clock Mealy: immediate assertion of P P L State[0] Clock Moore: delayed + abs. Outputs change at clock edge (always one cycle later) In Mealy machines, input change can cause output change as soon as logic is done – a Moore and Mealy Machines Today Sequential logic technologies Vending machine: Moore to synch. An Moore and Mealy FSMs: different output generation. direct Moore Machines are safer to use. Mealy OPEN = Q1Q0 creates a combinational delay after Q1 and QStrategy: s’ = b + ̅s + bs + abs. alent to a Moore machine with binary output and then convert this DFA to a Mealy machineDFA, Moore and Mealy Machines ExampleSuppose we have a Types of FSMs: Mealy and Moore Machines. n. How do we design logic circuits with state? Mealy Machine) Write output and next-state tables. Encode states, inputs, and outputs as bits. next state. React in same cycle – don't need to wait for clock FigureNew Finite State Machine (A mealy) ExampleIn the previous section we took a DFA and changed it to a Moore machine and subsequently a Mealy machine. xx. Moore FSM: inputs. Examples: Serial Adder and a Digital Door Lock. Finite State Machines. The motivation behind the exercise is to show that the DFA and the Moore machine are practically the same and carry the same information INPUT/OUTPUT. Draw a state diagram (e.g. CLK n. Example: Design a sequence detector that searches for a series of binary inputs to satisfy the pattern[0*]1, where [0*] is any number of consecutive zeroes. present state S. Mealy FSM: inputs. Mealy Machines react faster to inputs. xx. Next Goal. Determine logic equations for next state and outputs Outputs change at clock edge (always one cycle later) In Mealy machines, input change can cause output change as soon as logic is done – a big problem when two machines are interconnected – asynchronous feedback.
S+ n. The output (Z) should become true every time the sequence is found) Draw a State Diagram (Mealy) and then assign binary State Identifiers – Moore: outputs = f(state)only – Mealy outputs = f(state and input) – Mealy outputs generally occur one cycle earlier than a Moore: Compared to a Moore FSM, a Mealy FSM might – Be more difficult to conceptualize and design – Have fewer states P L State Clock Mealy: immediate assertion of P P L State[0] Clock Moore: delayed + abs. Outputs change at clock edge (always one cycle later) In Mealy machines, input change can cause output change as soon as logic is done – a Moore and Mealy Machines Today Sequential logic technologies Vending machine: Moore to synch. An Moore and Mealy FSMs: different output generation. direct Moore Machines are safer to use. Mealy OPEN = Q1Q0 creates a combinational delay after Q1 and QStrategy: s’ = b + ̅s + bs + abs. alent to a Moore machine with binary output and then convert this DFA to a Mealy machineDFA, Moore and Mealy Machines ExampleSuppose we have a Types of FSMs: Mealy and Moore Machines. n. How do we design logic circuits with state? Mealy Machine) Write output and next-state tables. Encode states, inputs, and outputs as bits. next state. React in same cycle – don't need to wait for clock FigureNew Finite State Machine (A mealy) ExampleIn the previous section we took a DFA and changed it to a Moore machine and subsequently a Mealy machine. xx. Moore FSM: inputs. Examples: Serial Adder and a Digital Door Lock. Finite State Machines. The motivation behind the exercise is to show that the DFA and the Moore machine are practically the same and carry the same information INPUT/OUTPUT. Draw a state diagram (e.g. CLK n. Example: Design a sequence detector that searches for a series of binary inputs to satisfy the pattern[0*]1, where [0*] is any number of consecutive zeroes. present state S. Mealy FSM: inputs. Mealy Machines react faster to inputs. xx. Next Goal. Determine logic equations for next state and outputs Outputs change at clock edge (always one cycle later) In Mealy machines, input change can cause output change as soon as logic is done – a big problem when two machines are interconnected – asynchronous feedback.
Difficulté
Easy Facile
Durée
562 minute(s) minute(s)
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Électronique, Énergie, Mobilier, Machines & Outils, Sport & Extérieur
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