6.2. Principles of Scan Chain Implementation

Try these first

1. 1.

   What does Scan-In (SI) allow in a scan chain?

   Hint

   Think about the entry point of data.

2. 2.

   Name one component of a scan chain.

   Hint

   Consider the components we discussed.

3. 3.

   What is the purpose of Scan-Out (SO) in a scan chain?

   • To shift data into the chain
   • To transfer test results out
   • To control operational mode

   Hint

   Think about where results go after testing.

4. 4.

   True or False: The length of a scan chain does not affect testing speed.

   • True
   • False

   Hint

   Recall our discussion on testing time.

5. 5.

   Design a hypothetical scan chain for a circuit with 5 flip-flops. Discuss the implications of varying its length and adding partitioning.

   Hint

   Consider how changing length affects time and coverage.

6. 6.

   Analyze the power versus performance trade-off when integrating multiplexers into a scan chain.

   Hint

   Consider how increased features can affect overall design efficiency.