Compared with software description languages, what are the characteristics of VHDL?

The characteristics of VHDL are: 1. It has strong portability; 2. It has rich simulation statements and library functions; 3. It has good readability; 4. The system design has nothing to do with the hardware structure. , which facilitates process conversion; 5. Supports modular design; 6. Flexible design, easy modification, fast product development and low cost.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

VHDL is a hardware description language for designing digital systems in the form of ordinary text. It is mainly used to describe the structure, behavior, functions and interfaces of digital systems and can be edited in any word processing software environment. In addition to containing many statements with hardware characteristics, its form, description style and syntax are very similar to high-level computer languages.

The VHDL program divides an engineering design project (or design entity) into a visible part that describes the external port signals and an internal invisible part that describes the logical relationship between the port signals. This divides the design project into internal parts. The concepts of the outer two parts are the basic features of Hardware Description Language (HDL).

When a design project defines an external interface (port), after its internal design is completed, other designs can use the external port to directly call this project.

The main features of VHDL are as follows:

1) As the first international standard of HDL, VHDL has strong portability.

2) It has rich simulation statements and library functions, and the design can be simulated at any time. Therefore, errors in the design can be eliminated before the circuit system is assembled, and the function of the design system can be checked in the early stage of the design. Feasibility and strong predictive ability.

3) VHDL has good readability, is close to high-level language, and is easy to understand.

4) The system design has nothing to do with the hardware structure, which facilitates process conversion and will not make the description obsolete due to process changes.

5) Supports modular design, which can decompose large-scale design projects into several small projects, and can also call existing design projects as a module.

6) The design is flexible and easy to modify. It also facilitates the exchange, storage and reuse of design results. The product development speed is fast and the cost is low.

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