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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
) b. V+ b g+ Y5 s& J) Ttest information can be represented. In the simplest of forms, this means it must be able to store3 W. I6 \+ z% d- v {" O
netlist information along with XY coordinates, and even reference designators and pin numbers9 J$ e5 | m) t: x
(if they exist). I feel like ending this article here before it gets unmanageable, but then Pete
$ q/ e1 a' R( G' bWaddell wouldn’t be happy, so let’s proceed. If all the information that a test system would" B# }4 y! T; }6 T' I
need to know to verify and test a bare board could be represented in a single file, it would bring) |4 s; V. o* y' t) n/ A- U6 b
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
3 I& j& d% f& w3 v& V0 v1 Nparameters
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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 about4 ?; |( j- p; G7 n. S3 B; B# I' O
the problem of testing the PCB before it is stuffed with parts. Therefore, most CAD packages
5 m. g( K4 @& n) V- ^8 F9 p* Ado not even provide the option of exporting a coordinate based netlist in this format. CAM; H+ y7 o4 Q% ^& T f- m/ |
software is the common source of this information. Net connectivity is computed from the5 b: l; E- t! j4 @& I
Gerber data and the file is exported. Nets are numbered because the original CAD netlist was# G0 v: A8 }7 ~8 `
not used. The RefDes/Pin# fields are also not filled in because this information does not exist in, x# S2 K F7 U, B8 R
the Gerber data. The IPC-D-356 file is then read by the bare board test system. The net
& Y! ~( Z- @& k- E% Ninformation replaces the need for the old “golden board” technique. This process is the way the
6 ^; P) j; q0 M/ J* ]! S* i8 `majority of the industry is working today. * Y0 u" d. T& V# c) R, _0 s" M
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发表于 2015-6-11 16:23
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反对！
楼主
发表于 2015-6-12 14:57
