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IPC网表和相应软件的操作 什么是ipc网表文件？ 准确的说应该是IPC-D-356网表文件，大家简称ipc网表文件。 它是一种特定格式的记录设计文件各逻辑关系的网络集合文件。 详细见以下英文描述（翻译水平有限就不翻译了 ) The IPC-D-356 format was designed to define a standard netlist format by which bare board# U0 n5 Z* D, N* f/ z8 Q* W
test information can be represented. In the simplest of forms, this means it must be able to store
$ l" d& Y# C% V1 P. m, c8 ^netlist information along with XY coordinates, and even reference designators and pin numbers
% j- g4 h! h# z, N- I$ R(if they exist). I feel like ending this article here before it gets unmanageable, but then Pete
0 Z$ ]) K1 S& c z' B fWaddell wouldn’t be happy, so let’s proceed. If all the information that a test system would$ e" H$ N$ c4 I6 m8 ]: g
need to know to verify and test a bare board could be represented in a single file, it would bring
6 H2 X+ ]2 O6 F" c# Yconsistency to the testing world. IPC-D-356 does just that. The IPC-D-356 format can carry a lot of information such as comments, format specifiers, field
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为什么要网表对比操作？主要是以下2点 1，pcb软件输出的光绘文件，有时会变异，会造成开短路，通过对比能保证网络一致性（概率很小） 2，工厂端通常要修改设计文件以便符合生产，修改当中就可能会造成开短路，通过对比可以保证网络一致性（作用主要是此点，保障工厂修改完的文件网络没有问题） Since testing bare boards is a manufacturing process, the design engineer seldom thinks about# u: s) b4 o% o' V
the problem of testing the PCB before it is stuffed with parts. Therefore, most CAD packages! p, V3 w* t7 \( I! g U
do not even provide the option of exporting a coordinate based netlist in this format. CAM l3 @( `) ^# S# Z( J
software is the common source of this information. Net connectivity is computed from the* d& w: C. z* {4 \
Gerber data and the file is exported. Nets are numbered because the original CAD netlist was% @: N A( C2 O# {
not used. The RefDes/Pin# fields are also not filled in because this information does not exist in2 v) p; K6 `, {: r1 u, t
the Gerber data. The IPC-D-356 file is then read by the bare board test system. The net* g" g' P1 B6 B
information replaces the need for the old “golden board” technique. This process is the way the
' f C2 @6 N: ?& Kmajority of the industry is working today. 0 p8 h! h% |& V' J! ~, n( J2 b
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发表于 2015-6-11 16:23
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