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This article mainly introduces the characteristics of VHDL, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

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

The operating environment of this tutorial: windows7 system, Dell G3 computer.

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

The VHDL program divides an engineering design project (or design entity) into an internal invisible part that describes the visual part of the external port signal and the internal invisible part that describes the logical relationship between the port signal. The concept of dividing the design project into internal and external parts is the basic feature 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 call the project directly.

The main features of VHDL are as follows:

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

2) with abundant simulation statements and library functions, the design can be simulated at any time, so the errors in the design can be eliminated before the circuit system is assembled, and the feasibility of the design system function can be checked in the early stage of the design. Has a strong ability to predict.

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

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

5) support modular design, decompose large-scale design projects into several small projects, and invoke existing design projects as a module.

6) the design is flexible and easy to modify, and at the same time, it is convenient for the exchange, preservation and reuse of design results. The product development speed is fast and the cost is low.

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