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What does the cut pattern "farm" mean?

RVERP

I can select it from the list but there's no information to find about it.

It result in something like this (see below) but I find it very hard to predict to outcome of the via pattern

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  • RVERP

    After looking at the rules present in the techno I came to the same conclusion. The farm is a way to maximise via cuts by creating different clusters of via's to fall under a smaller spacing rule. It does this by leaving out rows and/or columns. 

    The only piece of information that was missing for, both from the techno and the DRM, was the minimal space between two clusters so they are not interpreted as one. Now there is always one row/col left out. I suppose you need this spacing to decide how many cols/rows you need to blank out.

    But besides this remark, is my assumption correct that with this method you always have the max. number of vias?

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  • RVERP

    After looking at the rules present in the techno I came to the same conclusion. The farm is a way to maximise via cuts by creating different clusters of via's to fall under a smaller spacing rule. It does this by leaving out rows and/or columns. 

    The only piece of information that was missing for, both from the techno and the DRM, was the minimal space between two clusters so they are not interpreted as one. Now there is always one row/col left out. I suppose you need this spacing to decide how many cols/rows you need to blank out.

    But besides this remark, is my assumption correct that with this method you always have the max. number of vias?

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