7e_Glitches_and_Hazards_Slides

7e_Glitches_and_Hazards_Slides - ECE 3504 ECE 3504 Digital...

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Unformatted text preview: ECE 3504 ECE 3504 Digital Design 1 Digital Design 1 Section 7e: Glitches and Hazards What are Glitches What are Glitches What are Glitches? What are Glitches? We want to guarantee that an We want to guarantee that an output that shouldnt change as the result of a state transition doesnt h change . We also want to guarantee that an output that should change only changes once . These two occurrences are called lit h glitches . We can use the above situations to define two rules for changing the dont care outputs of unstable states into specified outputs. Glitch Glitch-Proofing an Proofing an Output Output If the output is the same before If the output is the same before and after the transition, it must remain the same during the t i t i Ch th d t transition. Change the dont care outputs to match the initial and final outputs. If the output changes during the transition, it must change only once At most only one dont care once. At most, only one don t care output can exist in the unstable states between two stable states having different outputs. Cycles Can Complicate Cycles Can Complicate Things Things We must account for the fact that We must account for the fact that certain state transitions can have more than one unstable state b t th Thi i...
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This note was uploaded on 01/17/2011 for the course ECE 3504 at Virginia Tech.

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7e_Glitches_and_Hazards_Slides - ECE 3504 ECE 3504 Digital...

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