Skip to the selected question
ASIC.FYI

ASIC Question Bank

1,000+ hardware interview questions
Question bank1110 results
  1. Easy
  2. Easy
  3. Medium
  4. Medium
  5. Medium
  6. Medium
  7. Easy
  8. Easy
  9. Easy
  10. Easy
  11. Easy
  12. Easy
  13. Easy
  14. Easy
  15. Medium
  16. Easy
  17. Medium
  18. Easy
  19. Hard
  20. Medium
  21. Medium
  22. Easy
  23. Medium
  24. Medium
  25. Medium
  26. Easy
  27. Medium
  28. Medium
  29. Easy
  30. Easy
  31. Medium
  32. Medium
  33. Hard
  34. Easy
  35. Medium
  36. Hard
  37. Easy
  38. Medium
  39. Hard
  40. Medium
  41. Medium
  42. Easy
  43. Medium
  44. Medium
  45. Medium
  46. Easy
  47. Hard
  48. Easy
  49. Easy
  50. Easy
DescriptionQ114
Page ↗
Q114DVASIC interview problem

Grant Remains High After Request Ends

TechniquesDVWaveform DebuggingArbitration
DifficultyEasy
TopicWaveform Debugging
LanguageSystemVerilog
Format4 choices
01

Problem

The arbiter samples req and arb_enable and drives a registered grant. arb_enable remains 1 throughout, and no request is pending after C3. Rule to apply: arb_enable=0 forces grant low. While arb_enable=1, sampling req=0 requires grant=0 after the next edge unless a new req is sampled. What is the root cause of the failure marked at C4?

Waveform for Grant Remains High After Request Ends. Signals: req, grant, arb_enable. Numbered markers identify sampled columns.
Read the sampled columns from left to right, then test each choice against the stated timing rule.
02

Answer choices (4)