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What is the physical meaning of a layer being "TRIM"?

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ttxs

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I only know that, in LEF files, there are definitions of ROUTING layers and CUT layers.

Now we need to identify if a particular layer is "TRIM" or not, based on the info in LEF file. In other words, I am trying to write a parser for LEF files, and there should be a "is_layer_trim" attribute for each ROUTING layer.

But the interesting part is that nobody in our group knows about the physical meaning of it. Could anybody give me some guidance?

Thanks a lot.
 

FYI, LEF parsers are available for free from the Si2 group.

TRIMPOLY Defines a trim poly layer for self-aligned double patterning (SADP) technology. Only cells would have shapes on that layer.
 
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