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库语句（Library） 6 s- y6 j7 q6 X# n8 g
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Library子句在本地环境下，为设计库定义一个逻辑名。
' z! M! u- v5 v) n6 S% q( {$ \A library clause defines logical names for design libraries in the host environment.$ V9 Z- _3 D* o$ j1 b$ d9 O
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语法（Syntax）) Z& A3 W) e& H, ?+ f: i
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library library_name, ... ; ; D; M" e' {# r2 k. M2 E
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/ x! ~( {5 A3 I说明（Description）7 Z1 F9 P1 T. ~7 V' c9 [
6 C. `9 T! }2 WLibrary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。
2 e. [' s6 A0 u% V. n- l: xThe 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. }9 V. G! N& N1 X
VHDL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。
( d3 a6 C' s {A 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. ! j+ M) T0 S$ \4 x4 r5 x# O0 d
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。
) j9 g- a) Y- `9 X2 NThere 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.
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发表于 2019-3-11 10:45
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