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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.
Basic concepts
Published in Zdravko Karakehayov, Knud Smed Christensen, Ole Winther, Embedded Systems Design with 8051 Microcontrollers, 2018
Zdravko Karakehayov, Knud Smed Christensen, Ole Winther
We distinguish between two basic types of sequential machines: Mealy machines and Moore machines. Figure 1.9 compares both structures. The present state of the sequential circuit is kept in the memory elements. The next state is a function of the X inputs and the present state. The Z outputs are defined by the present state and the X inputs for the Mealy machine. The Moore machine outputs are a function of the present state. The states, for example if we use two flip-flops, are 00, 01, 10 and 11. The input combinational logic circuit (Input CLC) takes care of the sequence of the states to be consistent with the specification. The output logic (Output CLC) yields the desired output values.
Behavioral Modeling
Published in Joseph Cavanagh, ® HDL Digital Design and Modeling, 2017
Example 8.25 A Moore synchronous sequential machine will be designed according to the state diagram shown in Figure 8.97. Since it is a Moore machine, the outputs are a function of the present state only. The outputs will be asserted for the entire clock cycle. The state codes are selected to provide glitch-free operation. This is only one of several viable state code assignments that will produce glitch-free outputs for z1 and z2. There are three unused states: y1y2y3 = 010, 100, and 110.
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.