what is cdc and how clock gating and power gating is useful?

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Accepted Answer

CDC stands for Clock Domain Crossing. Clock gating and power gating are techniques used to reduce power consumption in digital circuits.

CDC refers to the process of transferring data between two clock domains with different frequencies or phases.
Clock gating involves selectively disabling the clock signal to certain parts of a circuit when they are not in use, reducing power consumption.
Power gating involves completely shutting off power supply to unused parts of a circuit, further reducing power consumption.
These techniques are essential in low-power design for mobile devices and IoT applications.
Example: In a mobile phone, the display circuit can be power gated when the screen is turned off to save power.