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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
' ]/ I3 `1 B$ `5 x. Ntest information can be represented. In the simplest of forms, this means it must be able to store
; b+ Z5 _) K7 K, ]6 [3 Qnetlist information along with XY coordinates, and even reference designators and pin numbers2 I+ S: `0 F; _) A
(if they exist). I feel like ending this article here before it gets unmanageable, but then Pete
4 k( F* w# d1 ^; _6 Z: aWaddell wouldn’t be happy, so let’s proceed. If all the information that a test system would$ b) ~; v% r3 }
need to know to verify and test a bare board could be represented in a single file, it would bring
/ R O' {3 T0 ^7 W2 o0 B: m: l& U: Econsistency 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, field7 ~2 G% q: E7 F/ G2 H1 ~9 }
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# u2 {9 Q# Y; N2 @
the problem of testing the PCB before it is stuffed with parts. Therefore, most CAD packages$ @5 f7 W9 s' U6 G2 k/ Z3 ~7 L
do not even provide the option of exporting a coordinate based netlist in this format. CAM
) O% }; o1 U# G! W) }, @software is the common source of this information. Net connectivity is computed from the
0 _0 Q) j2 m6 uGerber data and the file is exported. Nets are numbered because the original CAD netlist was" ^% N, X3 d) \5 X0 M
not used. The RefDes/Pin# fields are also not filled in because this information does not exist in
* n5 [9 _! N9 ]$ Z5 jthe Gerber data. The IPC-D-356 file is then read by the bare board test system. The net
# }4 H+ @# G& i( R! Rinformation replaces the need for the old “golden board” technique. This process is the way the) |* J9 K1 J5 f, i S& w5 b% M
majority of the industry is working today.
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发表于 2015-6-11 16:23
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