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Q155FreeDesign Verification

Sequence response queue depth

Difficulty
Easy
Topic
UVM Components
Language
SV
Interview prompt

Question

A driver returns a response for every request, but the sequence never calls get_response and does not enable a response handler. After several requests, UVM reports response-queue overflow. Why?

Choose one

Answer choices

  1. A. Responses are stored in config_db, whose maximum depth is four
  2. B. A driver may return only one response for its entire lifetime
  3. C. Each sequence has a bounded response queue by default (eight entries in the mainstream UVM 1.2 reference behavior), so unconsumed responses accumulate
  4. D. The sequencer converts responses into objections, and the objection stack overflowed
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