HDL structure: In the concurrent section of a hardware description, which elements are interconnected to form the design's structural netlist?

Introduction / Context:
Hardware description languages separate structural connectivity from sequential/behavioral processes. The concurrent region expresses what is wired to what, producing a network that synthesizes into gates and interconnect.

Given Data / Assumptions:

• We consider structural HDL style (e.g., component instantiation and port mapping).
• Concurrent statements are order-independent and represent parallel hardware.
• Goal: identify what is being interconnected.

Concept / Approach:
Structural code instantiates components and interconnects them with signals. Components may represent submodules such as adders, decoders, registers, and multiplexers. Functions/macros are behavioral abstractions used inside components; “circuits” is a general term, but the precise HDL units wired together are component instances.

Step-by-Step Solution:

Verification / Alternative check:
Tool elaboration reports list instantiated components and the signals linking them, confirming that the concurrent section describes component-level wiring.

Why Other Options Are Wrong:

• Functions/macrofunctions: Behavioral constructs not directly “wired” like components.
• Circuits: Informal term; HDL connects component instances to realize circuits.

Common Pitfalls:
Assuming process order matters in concurrent code; confusing function calls inside processes with component interconnections.

Final Answer:
components