VHDL Structure

The process of VHDL design involves several key stages

• Behavioral Level: The behavioral level of the design is specified by the designer by describing how the functionality of the system is affected as a result of the external stimulus. Here, the focus is on actions of the system rather than on its inner structure. This view is the system as a whole and offers detailed information about system operations. Behavioral representations typically use the term processes, functions, and procedures to depict a system’s functionality in a thorough yet abstract format. Designers usually use behavior-based descriptions during the initial stages of design just to explore and validated system functionality before delving on lower levels of details.
• RTL level: The RTL describes the operation of data between registers and the execution of operations on that data. This sublevel demonstrates more in depth the way of operating the system by stating how data is moved through the registers and how it is changed by the combinational logic. RTL incorporates, assignments and conditional statements to demonstrate data transfers and operations as internal behavior of the system gets depicted at a finer level than that of behavioral description. RTL descriptions are used by designers to fine-tune the system feature, enhance performance and worst case scenario timing.
• Gate level: At the gate-level, the system is outlined through individual logic gates and their interconnections, which represent the lowest level of detail. At this level the exact specification of circuit diagram with logic gates and the connections to implement the desired functionality. Gate-level abstraction is one of the most important mechanism for synthesis tools in physical implementation of the systems because it specifies the particular gates and their desired connections. Designers use gate-level abstraction to perform microarchitecture, optimize power consumption, and verify that the physical implementation meets specifications.

The field of electronics engineering comprises digital design and IC design, among others, that deal with the creation and optimization of electronic systems and components. Digital design particularly seeks to build computer circuits, such as binary logic circuits, manipulating digital signals. Such tasks include designing memory units, arithmetic circuits, and logic gates.

Whereas IC design stands for the development of intricate, small-sized electronic circuits, which are combined onto a single silicon chip. Digital circuitry and ICs are created, simulated, and tested with specific software tools and procedures for various applications, such as microprocessors, memory chips, and communication systems. The objective of these fields is to develop efficient and reliable electronic devices that meet performance, power, and cost requirements.