Rivos Interview Questions and Answers

Q1. FSM and Rtl of sequence detector
Ans. 
Sequence detector is a digital circuit that detects a specific sequence of bits in a stream of input data.
• FSM (Finite State Machine) is commonly used to design sequence detectors.

• RTL (Register Transfer Level) describes the behavior of digital circuits using registers and logic gates.

• Example: A sequence detector that detects '1010' in a stream of binary data.

• Example: FSM states for this detector could be S0, S1, S2, S3
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Q2. Sv oops, virtual function, polymorphism
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Q3. Testbench structure, functions of agent, sequencer, sequence, driver etc
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Q4. Factory and factory override
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C++ on leetcode programming

Q1. Cpu branch predictor
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Q2. Cpu cache protocol
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Q1. How would you verify a last level cache?
Ans. 
Verify last level cache by running stress tests, analyzing cache hit/miss rates, and comparing performance metrics.
• Run stress tests to simulate high load scenarios and observe cache behavior

• Analyze cache hit/miss rates to ensure data is being efficiently stored and retrieved

• Compare performance metrics before and after cache verification to measure improvements

• Use tools like CacheGrind or Valgrind for detailed cache ana
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Q2. Describe an important debug that you've done.
Ans. 
Identifying and fixing a race condition in a multi-threaded system
• Observed intermittent failures in test results

• Used debugging tools like gdb and log analysis to trace the issue

• Identified the root cause as a race condition between two threads

• Implemented a mutex lock to resolve the issue

• Verified the fix by running stress tests
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