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Q175FreeDesign Verification

Multi-sequence response routing

Difficulty
Medium
Topic
UVM Components
Language
SV
Interview prompt

Question

Two sequences concurrently issue the same request type. The driver creates a fresh response and calls item_done(rsp), but never copies identity from req. What is the most likely protocol-level failure?

Provided context

Code to inspect

seq_item_port.get_next_item(req);
drive_and_fill(req, rsp);
seq_item_port.item_done(rsp);
Choose one

Answer choices

  1. A. item_done automatically randomizes rsp with req's constraints, so only coverage is affected
  2. B. The response may not be routed to the originating sequence because its sequence/transaction identity was not inherited from req
  3. C. Both sequences receive deep copies of every response by analysis broadcast
  4. D. The sequencer infers the requester solely from rsp.get_type_name()
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