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Calibre LVS PEX Warnings and Erros

Question asked by radike_d on Nov 23, 2010
Latest reply on Dec 6, 2010 by radike_d

Hi,
I am new to IC design using Cadance. I finished my layout and now trying to run LVS and PEX using Cadance. To run Calibre LVS, I first exported the schematic netlist from Export -> CDL_OUT option.

Then I included this file as my source netlist in the LVS setup.

 

When I run LVS I am getting the following Warnings.

 

WARNING: There is no data for layout net name __USER_DEFINED_LVS_POWER_NAME__

 


WARNING: There is no data for layout net name __USER_DEFINED_LVS_GROUND_NAME__

 

WARNING: Invalid PATHCHK request "GROUND && ! POWER" : no POWER nets present, operation aborted

 

WARNING: Invalid PATHCHK request "POWER && ! GROUND" : no POWER nets present, operation aborted

 

WARNING: Invalid PATHCHK request "! POWER && GROUND" : no POWER nets present, operation aborted

 

Is it possible to know how to clear these warnings?

Also, now when I run the PEX simulation I get the following errors

 

ERROR: There is no usable returns path nets in the PDB for inductance extraction.

 

ERROR: Net information could not be built.

 

ERROR: The inputs for inductance engine were not properly built.

 

I also get the warnings same as warnings in LVS. The above errors are related to parasitic Inductor extraction. I am not sue whether it because of the warning in LVS. 

 

Can somebody help me regarding this?

 

Thanks a lot!!!

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