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发表于 2016-8-31 10:03:00
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https://en.wikipedia.org/wiki/Gerber_format#Gerber_X2
Released in February 2014, Gerber X2 is fully backwards compatible with RS-274X, but adds additional metadata to reduce ambiguity. The X2 format identifies the function of each layer, the function of each pad (e.g. via, pad or through hole) and can identify filled vias and impedance controlled tracks. The format adds an MD5 checksum for validation.[18] Gerber X2 is often paired with an IPC-D-356 netlist to allow complete electrical testing.
Gerber X2 加了一些附加的元数据来减少歧义。比如指明了各层的功能，和焊盘的功能等。
Attributes allow to add metadata to a Gerber file. Attributes are akin to labels providing information associated with image files, or features within them. Examples of metadata conveyed by attributes are:
The function of the file. Is the file the top solder mask, or the bottom copper layer, etc?
The part represented by the file. Does it represent a single PCB, an array, a coupon?
The function of a pad. Is the flash is an SMD pad, or a via pad, or a fiducial, etc.
For more information about attributes see X2 FAQ or intro video in the external links. [1] [21] [22] [23] [24] |
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