6.4.3. Improving Fault Coverage

Try these first

1. 1.

   What is a redundant flip-flop?

   Hint

   Think about backup systems.

2. 2.

   What type of fault occurs when a flip-flop fails to change state?

   Hint

   Focus on state changes.

3. 3.

   What are redundant flip-flops used for?

   • To reduce circuit area
   • To improve fault observability
   • To speed up transitions

   Hint

   Think of their role in visibility and fault detection.

4. 4.

   True or False: Delay faults are always visible during normal operation.

   • True
   • False

   Hint

   Consider how testing approaches might differ from normal operations.

5. 5.

   Consider a digital circuit designed with just enough flip-flops for regular operation. Discuss how adding redundant flip-flops might improve test strategy despite increased area.

   Hint

   Think about the impact of observability.

6. 6.

   Create a testing strategy that utilizes advanced fault models for a hypothetical high-speed circuit. Outline potential pitfalls and how to overcome them.

   Hint

   Focus on the unique challenges high-speed circuits face.