"Sequential circuit" redirects here. For the synthesizer company, see Sequential Circuits.
In automata theory, sequential logic is a type of logic circuit whose output depends on the present value of its input signals and on the sequence of past inputs, the input history.[1][2][3][4] This is in contrast to combinational logic, whose output is a function of only the present input. That is, sequential logic has state (memory) while combinational logic does not.
Sequential logic is used to construct finite-state machines, a basic building block in all digital circuitry. Virtually all circuits in practical digital devices are a mixture of combinational and sequential logic.
A familiar example of a device with sequential logic is a television set with "channel up" and "channel down" buttons.[1] Pressing the "up" button gives the television an input telling it to switch to the next channel above the one it is currently receiving. If the television is on channel 5, pressing "up" switches it to receive channel 6. However, if the television is on channel 8, pressing "up" switches it to channel "9". In order for the channel selection to operate correctly, the television must be aware of which channel it is currently receiving, which was determined by past channel selections.[1] The television stores the current channel as part of its state. When a "channel up" or "channel down" input is given to it, the sequential logic of the channel selection circuitry calculates the new channel from the input and the current channel.
Digital sequential logic circuits are divided into synchronous and asynchronous types. In synchronous sequential circuits, the state of the device changes only at discrete times in response to a clock signal. In asynchronous circuits the state of the device can change at any time in response to changing inputs.
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In automata theory, sequentiallogic is a type of logic circuit whose output depends on the present value of its input signals and on the sequence of...
to sequentiallogic, in which the output depends not only on the present input but also on the history of the input. In other words, sequentiallogic has...
these gate setups the overall system has memory; it is then called a sequentiallogic system since its output can be influenced by its previous state(s)...
widely used to program PLCs, where sequential control of a process or manufacturing operation is required. Ladder logic is useful for simple but critical...
continuous industrial processes, in industries where combinatorial and sequentiallogic was the primary requirement, the PLC evolved out of a need to replace...
applying signals to its inputs. Typically, the external circuitry employs sequentiallogic to control the ALU operation, which is paced by a clock signal of a...
Kernel Language 0 (KL0) is a sequentiallogic programming language based on Prolog, used in the ICOT Fifth generation computer project. Comparison of Prolog...
(clockless or self-timed circuit): Lecture 12 : 157–186 is a sequential digital logic circuit that does not use a global clock circuit or signal generator...
arithmetic logic units, but they exclude sequentiallogic. They are an abstraction that omits many aspects relevant to designing real digital logic circuits...
a specified number of bits without the use of any sequentiallogic, only pure combinational logic, i.e. it inherently provides a binary operation. It...
and will have one or two outputs. It is the basic storage element in sequentiallogic. Latches and flip-flops are fundamental building blocks of digital...
same value as the setpoint. For sequential and combinational logic, software logic, such as in a programmable logic controller, is used.[clarification...
state of memory elements are synchronized by a clock signal. In a sequential digital logic circuit, data is stored in memory devices called flip-flops or...
Kia; Riedel, Marc (2017-06-29). "A Reconfigurable Architecture with SequentialLogic-Based Stochastic Computing". ACM Journal on Emerging Technologies in...
equations by converting them to hyperbolic equations Digital delay line, a sequentiallogic element Delay-line memory, a form of computer memory used on some of...
Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical...
A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing...
Sequential function chart (SFC) is a visual programming language used for programmable logic controllers (PLCs). It is one of the five languages defined...
provide additional integer divisors. (Classification: asynchronous sequentiallogic) An arrangement of D flip-flops is a classic method for integer-n division...
power supply rails (resembling an open collector scheme), so logic voltage levels in a sequential chain do not decrease. Simulation of circuits may be required...
advanced from simple logic systems based on a single chemical or physical input to molecules capable of combinatorial and sequential operations such as...
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