... is the top-level entity. If the design is hierarchical, thenthe top-level description will have lower-level descriptions containedin it. These lower-level descriptions will be lower-level entitiescontained ... instance, in the preceding example, the key-words are ENTITY, IS, PORT, IN, INOUT, and so on. The standard type pro-vided is BIT. Names of user-created objects such as mux, in the example above, will ... completed.The next example shows more complicated signal assignment state-ments and demonstrates the concept of concurrency in greater detail. InFigure 2-2 , the symbol for a four-input multiplexer...