Interview questions for APB protocol 

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Please keep in mind, some of these questions are suitable for experienced candidates only. 

1. What is the APB protocol, and why is it used?

2. Explain the difference between APB and AHB (Advanced High-performance Bus) protocols.

3. What are the different transfer types supported by the APB protocol?

4. Describe the APB bus architecture and its key signals.

5. How does the APB protocol handle data transfers between a master and a slave?

6. What is the role of the PSEL signal in the APB protocol?

7. Explain the purpose of the PENABLE signal in APB transfers.

8. How are wait states handled in the APB protocol?

9. Discuss the concept of burst transfers in the APB protocol.

10. How does the APB protocol handle bus arbitration in a multi-master system?

11. What are the advantages of using the APB protocol in a system design?

12. Explain the data width considerations in APB transfers.

13. How is clock synchronization maintained in APB-based systems?

14. Discuss the limitations or challenges of using the APB protocol.

15. Can you provide an example use case where the APB protocol is commonly employed?