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Questions and Answers
What is a static-1 hazard?
In the given example, why does F go to 0 for one unit time during a 1-0 transition on Z?
What defines a static-0 hazard?
How can a static-1 hazard be described?
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What type of hazard would exist in a properly designed two-level sum-of-products circuit?
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How can static hazards be detected in a two-level sum-of-products or product-of-sums circuit?
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What action can eliminate a static-0 hazard in a circuit?
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In a product-of-sums (OR-AND) circuit, what type of hazard may exist?
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What is the purpose of circling product terms on a Karnaugh map in relation to static hazards?
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Why is it important to add consensus terms in a two-level circuit to eliminate hazards?
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Study Notes
Hazards in Digital Circuits
- A static-1 hazard is a situation where the output of a digital circuit momentarily goes to 1 when it should remain at 0, or stays at 1 when it should go to 0, during a transition.
Static-1 Hazard
- F goes to 0 for one unit time during a 1-0 transition on Z because the transition on Z causes a brief glitch in the output F, resulting in a static-1 hazard.
Static-0 Hazard
- A static-0 hazard is a situation where the output of a digital circuit momentarily goes to 0 when it should remain at 1, or stays at 0 when it should go to 1, during a transition.
Hazard Description
- A static-1 hazard can be described as a situation where the output of a digital circuit exhibits a temporary pulse or glitch during a transition, resulting in an incorrect output.
Hazards in Two-Level Circuits
- In a properly designed two-level sum-of-products circuit, there are no hazards, as the output is guaranteed to be hazard-free.
Hazard Detection
- Static hazards can be detected in a two-level sum-of-products or product-of-sums circuit by analyzing the circuit's Karnaugh map or truth table.
Eliminating Static-0 Hazards
- Adding a redundant term to the circuit can eliminate a static-0 hazard, ensuring that the output remains stable during transitions.
Product-of-Sums (OR-AND) Circuits
- In a product-of-sums (OR-AND) circuit, a static-1 hazard may exist, causing the output to momentarily go to 1 during a transition.
Karnaugh Map and Hazards
- Circling product terms on a Karnaugh map helps to identify potential hazards in the circuit, allowing for the addition of consensus terms to eliminate them.
Consensus Terms
- Adding consensus terms in a two-level circuit is important to eliminate hazards, ensuring that the output remains stable and accurate during transitions.
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Description
Learn about static-1 hazards in digital circuits, where there is a possibility of the output producing a 0 glitch even though it is expected to be steady at 1. Explore the formal definition and understanding of static-1 hazards in circuit design.
