Interview prompt

Sequence needs response from driver — sketch rsp_port wiring.

WHITEBOARD CHAIN

1. DECLARE    interfaces / types / ports you need
2. SKELETON   class extends + utils macro + key methods
3. MECHANISM  fill one critical method while narrating
4. PITFALL    name one bug juniors make on this pattern
5. TEST       how you would smoke-test the component

Reference sketch (≤40 lines)

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// driver after drive
rsp = rsp_item::type_id::create("rsp");
rsp.set_id_info(req);
rsp.data = captured_data;
rsp_port.write(rsp);

// sequence
start_item(req, -1, null);
finish_item(req);
get_response(rsp);

Mechanism to narrate

• req carries id_info linking req to rsp

• seq_item_port for req; rsp_port for response path

• Pipelined driver may accept multiple req before rsp

Smoke test (5 minutes)

• Seq waits get_response — verify data matches driven beat.

• Missing set_id_info — get_response mismatch or hang.

Common pitfalls

• rsp without matching req id.

• Blocking get_response in wrong phase.

• No rsp_port connect in driver.