What is the difference of a static and dynamic Hazard?

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From what I know a Hazard is an unwanted effect caused by deficiency in the system or by external influences. A hazard in a logical system occurs when there is a change in input that does not result in a output change. But can someone explain to me what is or what is the difference of a static and dynamic Hazard?

    
asked by anonymous 11.08.2017 / 10:04

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Definition

Due to delays in electronic components, a circuit can glitch . A glitch is a short duration variation in the value of an output, when no variation is expected. A hazard occurs when there is a possibility of the circuit generating a glitch .

Static Hazard

A static hazard occurs when there is a possibility of an exit to undergo a momentary transition in conditions in which it was expected to remain unchanged. This may occur when a single function entry has its value changed and this change causes momentary change in the output of the function.

There are 2 types of Static Hazard

  • Hazard level 1, which happens when the output of the function should remain at the high logic level but momentarily passes through the low logic and then returns to the top.

  • Hazard of logical level 0, which happens when the output of the function should remain on the low logic level but momentarily passes through the level logic high and then back down.

    • DynamicHazard

    Adynamichazardoccurswhenitispossibleforanoutputtochangemorethanonce,underconditionswhereitwasexpectedtohaveasingletransition(0to1or1to0).Thisoccurswhenachangeinfunctioninputcausesmultiplechangestotheoutput.

    Thereare2typesofDynamicHazard

  • Theoutputofthefunctionthatshouldundergoasingletransitionfrom0to1,butundergoesatransitionfrom0to1(whichshouldbestable),thentransitionfrom1to0andthenreturnsto1,stable.

  • Theoutputofthefunctionthatshouldundergoasingletransitionfrom1to0,butundergoesthetransitionfrom1to0(whichshouldbestable),thensuffers'transitionfrom0to1andthenreturnsto0,gettingstable.

    • Link from where I copied the answer

        
    13.08.2018 / 10:52
    Return from JSON array Relationship of records of a table with itself