EDA365欢迎您登录！
您需要 登录 才可以下载或查看，没有帐号？注册
x
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
" b8 e! G% Z* a6 K( }+ T9 t; w) n$ ~test information can be represented. In the simplest of forms, this means it must be able to store' c& I% z6 Q. p: B b% P+ v
netlist information along with XY coordinates, and even reference designators and pin numbers: ~, _# h& \* u( m
(if they exist). I feel like ending this article here before it gets unmanageable, but then Pete5 O0 B( S! {% U. P; Z' C5 ]$ X
Waddell wouldn’t be happy, so let’s proceed. If all the information that a test system would
1 @: l* |+ q* H b, u, Ineed to know to verify and test a bare board could be represented in a single file, it would bring% C5 x6 J9 y0 i7 k
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* [2 ~, X4 H4 ~) r8 q, w& I
parameters
. [7 A0 G& |. `2 ~" l5 q
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
; f8 \2 F2 K6 _8 n5 q7 N& f+ bthe problem of testing the PCB before it is stuffed with parts. Therefore, most CAD packages, y1 x. I0 g/ S( ]5 m& g% T
do not even provide the option of exporting a coordinate based netlist in this format. CAM
. Y$ G) P* d$ h" r4 lsoftware is the common source of this information. Net connectivity is computed from the
# v) \% D5 z, Y6 X' f9 t' i7 y2 kGerber data and the file is exported. Nets are numbered because the original CAD netlist was& z$ m* p' k+ J ^) a3 m v& S
not used. The RefDes/Pin# fields are also not filled in because this information does not exist in
5 S2 o: x1 |/ S' r6 P% q( M% |the Gerber data. The IPC-D-356 file is then read by the bare board test system. The net
% ~' C" ^+ f+ f+ iinformation replaces the need for the old “golden board” technique. This process is the way the
: O1 x1 L$ }# u- k+ umajority of the industry is working today. % R) E8 p. H) u, E
/ t# d7 D' I9 ]8 z8 ]
. n+ z( U% [' @/ j! U
3 `) b$ D* F' c0 l; K" L) y4 @
; Z! \/ e' y3 i' \& D. f2 l4 K | 
[复制链接]
/1 
发表于 2015-6-11 16:23
收藏
淘帖
支持！
反对！
楼主
