库语句（Library）

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库语句（Library）

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Library子句在本地环境下，为设计库定义一个逻辑名。 A library clause defines logical names for design libraries in the host environment. 0 l( n. c, A+ R. ]4 { 语法（Syntax） library library_name, ... ; 1 说明（Description） 7 N( {  ]! P' n# VLibrary语句为设计库定义一个逻辑名，可以被设计单元使用。库是一个实现相关（implementation-dependent）的存储，为了便于预先分析设计单元。 The library clause defines the logical names of design libraries, which are used by the design units. A library is an implementation-dependent storage facility for previously analyzed design units. # J/ A+ b* |7 X  j+ NVHDL库常被作为主机文件系统的一个路径来实现。库名对应文件路径。 - K9 t" B, @; RA VHDL library is usually implemented as a directory in the host file system. The library name is mapped to the pathname of that directory by the VHDL tool. 有两个预定的库，被隐式使用：std和work。Std库包含包Standard和Textio。Work库是工作库，存储所有用户创建的分析的设计单元。所有用户指定的包都存储在工作库Work中。 ' N+ I. m% G) m$ U: UThere are two predefined libraries, which are used implicitly in every design: Std and Work. The Std library contains the packages Standard and Textio. The Work library is a working library, where all user-created and analyzed design units are stored. Also user-specified packages are stored in the working library Work. 游客，如果您要查看本帖隐藏内容请回复

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