In battery-powered devices, additional hardware and software complexity is required to reduce the clock speed or temporarily turn off the clock while the device is not being actively used, in order to maintain a usable battery life.Īsynchronous ( clockless or self-timed) sequential logic is not synchronized by a clock signal the outputs of the circuit change directly in response to changes in inputs. Even the flip-flops that are doing nothing consume a small amount of power, thereby generating waste heat in the chip. As the clock is usually a high-frequency signal, this distribution consumes a relatively large amount of power and dissipates much heat.
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