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Q063FreeDesign Verification

Predict Priority from If and Case Statements

Difficulty
Easy
Topic
RTL Design
Language
SV
Interview prompt

Question

A decoder has overlapping conditions. One version uses `if (c0) ... else if (c1) ...`; another uses a `case` statement whose legal input encodings are asserted mutually exclusive. Which statement is correct?

Choose one

Answer choices

  1. A. The `if/else if` text defines priority when both conditions are true; a fully specified mutually exclusive `case` expresses decode selection, but actual area and delay still depend on the logic and synthesis constraints.
  2. B. An `if/else if` statement has no priority because all synthesizable RTL is evaluated simultaneously.
  3. C. A `case` statement always creates parallel hardware with lower delay and larger area than any equivalent `if` statement.
  4. D. Omitting `default` from combinational `case` logic is safe because unmatched values automatically drive zero.
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