5.3.1. Fault Detection with Serial Testing

Try these first

1. 1.

   What is a scan chain?

   Hint

   Think about how they allow shifting of data.

2. 2.

   Define observability in the context of digital circuits.

   Hint

   Consider what it means to see internal workings.

3. 3.

   What is the primary purpose of serial testing?

   • To apply test vectors simultaneously
   • To apply test vectors in sequence
   • To eliminate the need for testing

   Hint

   Consider how test vectors are handled.

4. 4.

   True or False: Observability enhances the ability to control inputs during testing.

   • True
   • False

   Hint

   Think about the definitions of each term.

5. 5.

   Design a simple digital circuit that uses scan chains for fault detection. Discuss how you would implement observability and controllability in your design.

   Hint

   Think about how you would structure the circuit for testing.

6. 6.

   Analyze a case study where a digital circuit using scan chains failed to detect a specific type of fault. Discuss possible reasons and suggest design adjustments.

   Hint

   Consider how test patterns might have been insufficient or if connections were not optimal.