This invention relates to memory devices and operating methods, and more particularly to data line discharging circuits and methods for memory devices. 3, 2004, the disclosure of which is hereby incorporated herein by reference in its entirety as if set forth fully herein. §119 of Korean Patent Application 2004-0088986 filed on Nov. So, based on the requirement we can use one of them.This application claims the benefit under 35 U.S.C. There is an equivalent Mealy state machine for each Moore state machine. In general, the number of states required in Moore state machine is more than or equal to the number of states required in Mealy state machine. In the above figure, there are two transitions from each state based on the value of input, x. Here, only the input value is labeled on each transition. These states and the respective outputs are labelled inside the circles. In the above figure, there are four states, namely A, B, C & D. The state diagram of Moore state machine is shown in the following figure. Therefore, the outputs will be valid only after transition of the state. So, based on next states, Moore state machine produces the outputs. In this case, the present inputs and present states determine the next states. Those are combinational logic and memory. The block diagram of Moore state machine is shown in the following figure.Īs shown in figure, there are two parts present in Moore state machine.

Moore State MachineĪ Finite State Machine is said to be Moore state machine, if outputs depend only on present states. There is an equivalent Moore state machine for each Mealy state machine. In general, the number of states required in Mealy state machine is less than or equal to the number of states required in Moore state machine. Here, 0 / 0, 1 / 0 & 1 / 1 denotes input / output.

Transitions between these states are represented with directed lines. These states are labelled inside the circles & each circle corresponds to one state. In the above figure, there are three states, namely A, B & C. The state diagram of Mealy state machine is shown in the following figure. Therefore, the outputs will be valid only at positive (or negative) transition of the clock signal. So, based on the present inputs and present states, the Mealy state machine produces outputs. Memory is useful to provide some or part of previous outputs (present states) as inputs of combinational logic. The block diagram of Mealy state machine is shown in the following figure.Īs shown in figure, there are two parts present in Mealy state machine. Mealy State MachineĪ Finite State Machine is said to be Mealy state machine, if outputs depend on both present inputs & present states. Now, let us discuss about these two state machines one by one. So, this behavior of synchronous sequential circuits can be represented in the graphical form and it is known as state diagram.Ī synchronous sequential circuit is also called as Finite State Machine (FSM), if it has finite number of states. We know that synchronous sequential circuits change (affect) their states for every positive (or negative) transition of the clock signal based on the input.

Circuit coder tri state