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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
& T; f7 [0 r& @4 t& Z& c7 jtest information can be represented. In the simplest of forms, this means it must be able to store2 q( H8 M$ F G( o
netlist information along with XY coordinates, and even reference designators and pin numbers2 Q# R% y; q1 }* G5 u$ T
(if they exist). I feel like ending this article here before it gets unmanageable, but then Pete
" u; E# z- R7 z* D0 b7 n$ MWaddell wouldn’t be happy, so let’s proceed. If all the information that a test system would; [1 ~ D) m" v
need to know to verify and test a bare board could be represented in a single file, it would bring# ^+ a3 V2 r) h; @
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& X; Q1 Y# E$ }: O; h' V
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% E2 J! Z9 A! {% x3 ~" V5 D
the problem of testing the PCB before it is stuffed with parts. Therefore, most CAD packages
6 P% U6 \7 ?' s$ M* Qdo not even provide the option of exporting a coordinate based netlist in this format. CAM" M8 o `' o3 |# y1 c. m
software is the common source of this information. Net connectivity is computed from the6 J- |. l+ P: ?5 f! m# K7 k. k& D+ K9 M3 o
Gerber data and the file is exported. Nets are numbered because the original CAD netlist was
6 u I% B: j5 M* Q7 i$ I* r& ?not used. The RefDes/Pin# fields are also not filled in because this information does not exist in
6 m0 ]' z! y# g) u- mthe Gerber data. The IPC-D-356 file is then read by the bare board test system. The net4 |/ `6 H6 I; G( H/ {' y2 }
information replaces the need for the old “golden board” technique. This process is the way the3 n8 q( f4 B/ R9 v
majority of the industry is working today.
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发表于 2015-6-11 16:23
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