![]() Therefore, the speeds of the asynchronous logic circuits are much higher than the synchronous circuits. Rather, each individual flip-flop is clocked through the main clock signal or by an output of another flip-flop. In asynchronous logic, all the flip flops are not clocked at the same cycle. As a result, the speeds of the synchronous circuits are limited and energy wastage occurs when distributing the signal to every flip-flop element. The main disadvantages of synchronous logic are the limited clock speed available and the requirement of a clock signal for every flip-flop. The main advantage of synchronous logic is its simplicity. This signal, often called the clock pulse, activates the logic circuit for a single operation. In synchronous logic, the logic operation is repeated cyclically through an oscillating signal supplied to every flip-flop in the circuit. ![]() Sequential logic is further divided into synchronous logic and asynchronous logic. Flip-flops are designed to retain the state of the system, therefore, considered as a basic memory element. The fundamental implementation of sequential logic is flip-flops. Sequential logic is used to design and build finite state machines. In most cases, the output signal is fed back into the circuit as a new input. Sequential logic is the form of Boolean logic where the output is a function of both present inputs and past outputs. Half adders, full adders, multiplexers, demultiplexers, decoders and encoders are also built based on the combinational logic. The arithmetic and logic unit of a CPU performs combinational operations on the data string. The output is independent of the previous outputs therefore it is sometimes, called time independent logic.Ĭombinational logic is used to perform Boolean operation on binary input signals and binary data. In combinational logic, the output is a function of the present inputs only. Each type of logic can be used to implement different digital elements used today. Boolean logic, based on the nature of the outputs, is separated into combinational logic and sequential logic. Digital devices are created using the principles of Boolean logic. Digital electronics is the basis of modern technological advancements.
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