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I am checking layer ID in a layout data base with following command.
But it is not giving layer id as in *_Tech.layermap file.
i.e. for M2 pin & M2 drawing above command giving 15 15 , but in tech file M2 pin ..layer id is 17 32 & for M2 drawing layer id is 17 0.
please suggest me right way to check that ...
The layerNum is the database layer number (there's a similar purpose number too which you can find with techGetPurposeNum()). However, that is the number used to store the layer in the database itself. The layerMap file is for the stream (or "GDSII") layer number - there is no requirement that this number is the same as the database number. So the technology database encodes the mapping from layer and purpose names to database layer numbers and purpose numbers. The layermap encodes the mapping from layer and purpose names to stream layer and datatype numbers.
In reply to Andrew Beckett:
I understand your explination. I need help in that case...
1) how i should find out database layer numbers and purpose numbers ?
2) how i should ensure that it (database layer numbers and purpose numbers) exist in techlayermap
ie let suppose i have ported layout data base from 32nm to 28nm then i would like to ensure that there is no unkown layer ( layers which does not support by 28nm)
Please help me with above !!!!!!
Once again thanks for time
In reply to hi2yogi:
You can find the database layer numbers and purpose numbers by dumping the technology file (from Tools->Technology File Manager->Dump in the CIW).
Your second question doesn't make sense, because it's the mapping from layer purpose names to stream layer/datatype numbers that are in the layermap file.
I don't know how you've "ported" the layout database from one technology to the other - so it's hard to answer the final question.