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Synthesis of Synchronous Sequential Machines 1 Using Verilog HDL
Published in Joseph Cavanagh, Sequential Logic and Verilog HDL Fundamentals, 2017
The next-state function δ for Mealy machines maps the Cartesian product of X and Y into Y, and thus, is determined by both the present inputs and the present state. The output function λ maps the Cartesian product of X and Y into Z, such that the output vector is a function of both the present inputs and the present state. This is the underlying difference between Moore and Mealy machines — the outputs of a Moore machine are directly related to the present state only, whereas, the outputs of a Mealy machine are a function of both the present state and the present inputs.
Dataflow Modeling
Published in Joseph Cavanagh, ® HDL Digital Design and Modeling, 2017
7.14 Design a Mealy pulse-mode asynchronous sequential machine which has two inputs x1 and x2 and one output z1. For a Mealy machine, the outputs are a function of the present states and the present inputs. Output z1 is asserted coincident with the x2 pulse if the x2 pulse is immediately preceded by a pair of x1 pulses. Use SR latches and D flip-flops in a master-slave configuration. Use NAND logic for all gates and latches except for output z1, which will be an AND gate.
Sequential Logic Design Using Verilog HDL
Published in Joseph Cavanagh, Verilog HDL Design Examples, 2017
The Mealy class of synchronous sequential machines is the result of a paper by G. H. Mealy in 1955 on the synthesis of sequential circuits. The definitions for Mealy and Moore machines are the same, except that the outputs of a Mealy machine are a function of both the present inputs and the present state, whereas the outputs of a Moore machine are a function of the present state only. This is the underlying difference between Moore and Mealy machines. A Moore machine, therefore, can be considered as a special case of a Mealy machine.
Finite State Machine-Based Load Scheduling Algorithm for Smart Home Energy Management
Published in IETE Journal of Research, 2021
M. L. Merlin Sajini, S. Suja, S. Merlin Gilbert Raj, S. Kowsalyadevi, Charisma Maria
A state machine model is a mathematical model that categorizes all possible device states. Each machine state is assessed, displaying all possible iterations between subjects and objects. The state machine is used to model real-world problems by identifying each state of the problem and how the transitions occur from one state to another. The fundamental paradigms for applying finite state machines are Mealy and Moore. In the Mealy model, performance is a function of both the present state and the data. The output under the Moore model is just a function of the current state. A Mealy finite state machine, or Mealy machine, is the Mealy model of a sequential circuit, while a Moore finite state machine, or Moore machine, is the Moore model.