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{{title|Clock Cycle}}
 
{{title|Clock Cycle}}
'''Clock Cycle'''  (also known as '''clock period''', '''clock tick''', or simply a '''tick''' or a '''cycle''') is the minimum time unit required to perform all the most basic operations in a [[synchronous circuit]] such as a value transfer between two buffers. The length of a single clock cycle is the time required for one complete clock pulse. It is the reciprocal of the [[clock speed]].
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'''Clock Cycle'''  (also known as '''clock period''', '''clock tick''', or simply a '''tick''' or a '''cycle''') is the minimum time unit required to perform the most basic operation on a microprocessor such as a value transfer between two buffers. The length of a single clock cycle is the time required for one complete clock pulse. It is the reciprocal of the [[clock speed]]. The  
 
 
== Overview ==
 
The clock cycle is a fundamental part of all [[synchronous circuits]] which must accommodate the time taken for the longest [[critical path]] for all possible states in a circuit. In other words, it's usually the sum of all the wire and switching delay for the longest indivisible portion of the circuit. The clock cycle is usually a constant value, although various [[power management mechanisms]] can modulate it to achieve better performance and efficiency attributes.
 
 
 
The clock cycle is the reciprocal of the [[clock speed]].
 
 
 
:<math>\text{clock cycle} = \frac{1}{\text{clock speed}}</math>
 
 
 
For example, a [[microprocessor]] operating at 1 GHz has a clock cycle of 1 [[ns]].
 
 
 
:<math>\text{clock cycle} = \frac{1}{1 \text{GHz}} = 1 ns</math>
 
 
 
=== Relation to execution time ===
 
{{main|runtime}}
 
Thus, the [[runtime|length of time it takes to execute]] [[serialized code]] is directly related to the length of a clock cycle (or clock speed).
 
 
 
:<math>\text{execution time} = \text{clock cycles for a code} \times \text{clock cycle} = \frac{\text{clock cycles for a code}}{\text{clock speed}}</math>
 
 
 
== See also ==
 
* [[clock speed]]
 
* [[synchronous circuits]]
 
* [[critical path]]
 
* [[performance]]
 
  
  
 
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