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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 board8 @7 e- i' K1 v$ V+ R8 I
test information can be represented. In the simplest of forms, this means it must be able to store6 C: d- B- H& t7 B! p
netlist information along with XY coordinates, and even reference designators and pin numbers% v' n6 Y) H5 M. m" C
(if they exist). I feel like ending this article here before it gets unmanageable, but then Pete
( b# @8 F6 {+ s' V OWaddell wouldn’t be happy, so let’s proceed. If all the information that a test system would0 ?. w5 o8 s6 Z7 P$ N0 Z
need to know to verify and test a bare board could be represented in a single file, it would bring9 x0 f) L+ m% u
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
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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 about5 u& ?& v% X; Y
the problem of testing the PCB before it is stuffed with parts. Therefore, most CAD packages
/ }! h2 p+ F) M% [8 A# h2 |do not even provide the option of exporting a coordinate based netlist in this format. CAM; M" Q7 P5 Z0 j+ i) R
software is the common source of this information. Net connectivity is computed from the
# u; p1 @1 y1 P% @- ?7 I- kGerber data and the file is exported. Nets are numbered because the original CAD netlist was
# L/ e4 q1 H! jnot used. The RefDes/Pin# fields are also not filled in because this information does not exist in9 ]8 z# U' K2 |; Z) k1 ^+ e
the Gerber data. The IPC-D-356 file is then read by the bare board test system. The net4 o2 J8 s3 x7 \ r
information replaces the need for the old “golden board” technique. This process is the way the
6 W. \; X- v% |0 emajority of the industry is working today. Y; h+ Z6 D8 n% C0 v
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发表于 2015-6-11 16:23
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楼主
发表于 2015-6-12 14:57
