Important DFT questions

TOP 10 : DFT Questions


1. What is Scan Chain Methodology ? Can you explain in a detailed manner



2. MSV ? Macro Structures Verification ?




3. Why TRST in 1149 Mode is a Optional Pin ?



4. Difference between Extest and Sample/Preload Instructions in 1149 Mode ?



5. What is the Functionality of the Locked Up Latch



6. What are the criteria of the Test Selections for a Clock Gating Circuitry ?



7. Can you explain Basic DFT Flow ?



8. Scan chain Reordering and Why is it needed ?



9. LSSD ?



10. Advantages and Disadvantages of the Muxed and LSSD Scan approaches ?



Please post your answers