ASYNCHRONOUS CIRCUIT Meaning and
Definition
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An asynchronous circuit refers to a type of digital circuit where the components or modules operate independently and update their outputs without any global clock signal controlling their synchronization. Unlike synchronous circuits that rely on a clock signal to synchronize their operations, asynchronous circuits use different techniques, such as handshake protocols, to enable communication and synchronization between their modules.
In an asynchronous circuit, each component processes data and makes state transitions as soon as the inputs are available, without waiting for a clock signal. The outputs are then updated based on the completion of these operations, ensuring that the circuit functions correctly. This decentralized approach allows for more flexibility and scalability in circuit design, as it eliminates the need for a global clock signal and enables components to operate at their own pace and respond to different input changes independently.
Asynchronous circuits are commonly employed in applications where speed, power efficiency, and modularity are crucial, such as in low-power devices, data communication systems, and asynchronous processors. They offer advantages like reduced power consumption due to the absence of clock toggling and improved speed in certain scenarios. However, they also present challenges related to complex timing analysis, hazards, and metastability, which require careful design and verification techniques to ensure reliable functionality.
Overall, an asynchronous circuit refers to a digital circuit that operates without a global clock signal, allowing its components to function independently and update their outputs based on their inputs and local timing.
Etymology of ASYNCHRONOUS CIRCUIT
The term "asynchronous" in the context of circuits and electronics originates from the Greek words "a-" meaning "without" or "not", and "syn-" meaning "together" or "with". "Chronos" means "time" in Greek. Hence, "asynchronous" can be understood as "not occurring at the same time" or "not synchronized with time".
The word "circuit" refers to a complete path through which an electric current can flow. It comes from the Latin word "circuitus", meaning "a going round" or "a course". In the context of electronics, a circuit refers to a closed loop through which electric charges can flow.
Combining these two terms, "asynchronous circuit" refers to a circuit that operates without a central clock signal to synchronize its components' actions.
