NCX tool indices file issue

[elliot_cai]

Hello!

I am running NCX tool making 0.18um 5V digital standard cells .lib file.

When I writing the .indices file that needed when running the tool. Some index values must be setup before running:
ncx_input_net_transition_index : 0.03, 0.1, 0.4, 0.9, 1.5, 2.2, 3 ;
ncx_input_transition_time_index : 0.03, 0.1, 0.4, 0.9, 1.5, 2.2, 3 ;
ncx_total_output_net_capacitance_index : 0.00035, 0.0035, 0.021, 0.0385, 0.084, 0.147, 0.231 ;
ncx_constrained_pin_transition_index : 0.03, 2.2, 3 ;
ncx_related_pin_transition_index : 0.03, 1.5, 2.2 ;

I use the index values I get from 0.18um 1.8V .lib file first, but get many negative values in the generated .lib file.

So I want ask how to setup these index values based on the 5V process?

Thanks!

 

[Oveis.Gharan]

Hi dear Elliot
Could you please describe the above indexes roles in library characterization?
Why they are important in library generation?

Thanks in advance.

 

[njr@1]

Hi dear Elliot
Could you please describe the above indexes roles in library characterization?
Why they are important in library generation?

Thanks in advance.

The indexes are the values for input slew to calculate or characterize the delay timing of the cells.