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Anything related to clock signal frequency (a.k.a. clock speed) issues in digital systems.

Anything related to clock signal frequency (a.k.a. clock speed) issues in digital systems.

The vast majority of digital systems operate in synchronous mode, i.e. they perform their operations only when they are directed to do so by a synchronization signal, commonly called clock signal or simply clock.

The clock is typically a square wave with a fixed frequency (clock frequency), often with a low duty-cycle. Most digital circuits react to the arrival of either the positive-going or the negative-going edge of clock pulses.