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GDS DBU and Database DBU mismatch

Anas2023a95

Dear all, 

I'm trying to import a layout from Innovus to Virtuoso as a GDS file. 

When I export the GDS file from Innovus, the following is shown: 

This clearly states that DBU is set to 2000 in the technology file (which I have verified and it is actually 2000 in the .lef file) and the generated GDS file has 2000 units per micron of precision, which sounds good! 

However, when I import the GDS file into Virtuoso, the log file shows the following warning: 


WARNING (XSTRM-284): DbuPerUU (1000) specified in the technology database or using '-dbuPerUU' is not divisible by the value (2000) set in the GDSII file. This can cause loss in data precision during translation.  

It says that there is a mismatch between DBU in GDS (2000) and the tech database (1000)! 

I have tried this solution to change the DBU stored for a library but I still have the same warning. 

Any idea on how to tackle it?

Many thanks

Anas 

  • Hi Anas,
    to get an answer to a Virtuoso related questions, you can post it in the Custom IC Design section.
    However, given that your database has its precision set to 1000, I think that the easiest solution is to set the same precision when streaming out the data from Innovus with "streamOut -units 1000 ...".

    - Dimo

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