库语句（Library）

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库语句（Library）

Library子句在本地环境下，为设计库定义一个逻辑名。 2 l8 ?9 c- c+ |5 x2 }A library clause defines logical names for design libraries in the host environment. / M$ b4 ]3 N( x: l+ f 语法（Syntax） library library_name, ... ; 1 : o4 y3 x7 i: M说明（Description） 1 J: }8 @& c5 P7 i/ V1 O 0 j' H2 _% `* e6 cLibrary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。 / b  V: z2 P0 H4 O, s* r( oThe 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. ; r/ b# k( t* \, L; J, _9 VVHDL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。 9 e6 Y# l/ R$ ~- i  K5 S# D# OA 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。 1 p. w! S9 _1 }4 |There 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. % V5 M! J* i5 L3 N+ ?# `' _) c 游客，如果您要查看本帖隐藏内容请回复

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