Describe common RTL lint warnings and errors

Q: Describe common RTL lint warnings and errors

This is a Software Engineering Fundamentals interview question from Apple for Software Engineer roles. View the full question and solution on PracHub.

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Question

You are writing RTL (e.g., Verilog/SystemVerilog) and run a lint tool on your code.

The tool reports items such as:

"Treat as black box"
Combinational loop
Left-hand side (LHS) / right-hand side (RHS) not equal length (width mismatch)

Explain for each of these:

What situation usually causes the warning or error.
Why it can be dangerous if left unfixed.
Typical ways you would investigate and fix the issue in your RTL.

Also briefly describe why running lint is important in a digital design flow.

Describe common RTL lint warnings and errors

Solution

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