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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
# p [! R2 N3 { C3 Wtest information can be represented. In the simplest of forms, this means it must be able to store' y/ K) X7 B o% S. w9 G" `8 \
netlist information along with XY coordinates, and even reference designators and pin numbers( q, p* t. L& L) u" h
(if they exist). I feel like ending this article here before it gets unmanageable, but then Pete
7 V9 {/ R+ v/ B2 j% M+ M; EWaddell wouldn’t be happy, so let’s proceed. If all the information that a test system would7 X( e) i$ h- t% _% D# N
need to know to verify and test a bare board could be represented in a single file, it would bring
8 L* n/ e5 V1 S9 qconsistency 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
+ \' }. G% J0 }the problem of testing the PCB before it is stuffed with parts. Therefore, most CAD packages) g$ ?. }+ A) M$ `6 P$ _
do not even provide the option of exporting a coordinate based netlist in this format. CAM1 D' S/ U S5 d. O& _, E
software is the common source of this information. Net connectivity is computed from the) H$ V( X" R/ G* c- O- s
Gerber data and the file is exported. Nets are numbered because the original CAD netlist was/ c# b/ r- e6 ~5 y8 }: w
not used. The RefDes/Pin# fields are also not filled in because this information does not exist in# y8 u2 e! ^, w
the Gerber data. The IPC-D-356 file is then read by the bare board test system. The net
/ ^% _7 A; H# p7 _% U1 Q& A% J8 Cinformation replaces the need for the old “golden board” technique. This process is the way the2 u! L! `1 P- r3 ~1 H9 ~2 q+ _" f
majority of the industry is working today.
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发表于 2015-6-11 16:23
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楼主
发表于 2018-4-12 14:47
