VHDL之code structure

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VHDL code is composed of at least 3 fundamental sections:

1) LIBRARY declarations: Contains a list of all libraries to be used in the design. For example: ieee, std, work, etc.

2) ENTITY: Speci?es the I/O pins of the circuit.

3) ARCHITECTURE: Contains the VHDL code proper, which describes how the circuit should behave (function).

A LIBRARY is a collection of commonly used pieces of code. Placing such pieces inside a library allows them to be reused or shared by other designs.

VHDL之code structure

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原文地址：http://www.cnblogs.com/mengdie/p/4483103.html