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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
. l; N6 W, k7 D, }test information can be represented. In the simplest of forms, this means it must be able to store1 j3 }( W9 R2 t1 o$ \: [
netlist information along with XY coordinates, and even reference designators and pin numbers
1 q7 Z$ m# ?0 w( r) Z3 }. F/ H(if they exist). I feel like ending this article here before it gets unmanageable, but then Pete! d v+ a9 ~! q! ?6 @' ~
Waddell wouldn’t be happy, so let’s proceed. If all the information that a test system would
5 q4 [6 X9 w* V# T9 m) Aneed to know to verify and test a bare board could be represented in a single file, it would bring" c2 N1 ^& Y& s, T! e) Q
consistency 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 d8 x# d: @8 ^; T" H% h W
parameters
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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% \; |2 t6 o9 I) R
the problem of testing the PCB before it is stuffed with parts. Therefore, most CAD packages
0 K, z5 f6 l5 Y( mdo not even provide the option of exporting a coordinate based netlist in this format. CAM
, s" j' H6 o* N N+ bsoftware is the common source of this information. Net connectivity is computed from the) m! j' D! F1 {2 {( w9 k
Gerber data and the file is exported. Nets are numbered because the original CAD netlist was
1 e8 F' v$ L3 V) k7 O% [$ P/ ]not used. The RefDes/Pin# fields are also not filled in because this information does not exist in
7 ^5 h6 R7 F' ]! U1 k0 hthe Gerber data. The IPC-D-356 file is then read by the bare board test system. The net
& u" c, H" ~. N# w: q" sinformation replaces the need for the old “golden board” technique. This process is the way the( D }2 B' [8 ]
majority of the industry is working today.
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发表于 2015-6-11 16:23
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