In the new EAGLE Version 6 format, the EAGLE brd-file is saved in XML format. Also new in EAGLE version 6 is that the used Design Rules Settings (used DRU-file) are embedded and saved in the EAGLE board file (EAGLE brd-file).
In the previously released EAGLE design rules of Eurocircuits (eC-EAGLE-design-rules-24-06-2011.zip) the DRU file description contained quote-characters (“), which are not supported as such in the XML format.
Using these “old” eC-EAGLE-design-rules in EAGLE Version 6 will lead to errors when trying to load a Version 6 EAGLE brd-file which has been saved with the “old” eC-EAGLE-design-rules. The eC-EAGLE-design-rules have been updated to correct this problem:
When you downloaded the eC-EAGLE design rules earlier and you did not upgrade to version 6 yet, you do not need to install these new DRU files. When you upgraded to version 6 of EAGLE we advise to use these new design rule files.
During the design of a PCB and certainly at the end of the PCB design, it is imperative that you check your layout against some technology rules in order to be sure that you design a producible PCB layout.
The basic items to check in a design are related to the “copper image” of the PCB, these are:
the track widths
the isolation distance between different tracks and/or component/via pads
and the annular ring (or restring) on component/via pads.
Next to these basic items, other items that can be checked are for instance related to:
soldermask (eg Soldermaskpad oversize),
items related to the mechanical outline of the PCB (eg distance of copper to the PCB contour),etc…
All these different checks to be made we call the “Design Rules”.
“Design rules” can be specified in most of the CAD-PCB design software. In some they arevery basic, in other the possible settings are more extended.
For CadSoft EAGLE we have made different “Design Rule Settings” (DRU-files) which contain the specific minimum design rules for a specific service of Eurocircuits.
We provide DRU files for the following Eurocircuits services :