What is the difference of a static and dynamic Hazard?

Question

As far as I know a Hazard is an undesirable effect caused by the deficiency in the system or by external influences. An Hazard in a logical system occurs when there is a modification in the input which does not result in a change in output. But can someone explain to me what it is or what the difference is between a static Hazard and a dynamic?

Answer 1

Definition

Due to delays in electronic components, a circuit can lead to a Glitch. A Glitch is a short-term variation in the value of an output when no variation is expected. A Hazard when there is the possibility of the circuit generating a Glitch.

Static hazard

There occurs a Static Hazard when there is a possibility of an exit undergo a momentary transition in conditions that were expected to remain unchanged. This can occur when a single function input has its changed value and this change causes momentary change in function output.

There are 2 types of Static hazard

1. Hazard logical level 1, which happens when the output of the function should remain at the logical high level, but briefly pass the level logico down and then back to the top.

2. Hazard logic level 0, which happens when the output of the function should remain at the logical low level, but briefly pass the level logico alto and then returns to the bass.

Dynamic hazard

There occurs a Hazard dynamic when an output is possible to change more than once, in conditions where it was expected to have a single transition (from 0 to 1 or from 1 to 0). This occurs when a change in the function input causes multiple changes in the output.

There are 2 types of Dynamic hazard

1. The output of the function should undergo a single transition from 0 to 1, but transition from 0 to 1 (which should be stable), then transition from 1 to 0 and then return to 1, becoming stable.

2. The output of the function that should undergo a single transition from 1 to 0, but undergoes the transition from 1 to 0 (which should remain stable), then suffers transition from 0 to 1 and then return to 0, becoming stable.

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