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Query re. .vg and .ddc files

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beowulf

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Hi,
I have a basic query re. vg netlist and ddc files.
I am trying to verify the cells in the design vs netlist. Say I have a cell INVX8 in my design.
When I count the number of such cells in the .vg file I get a certain number, something like

% grep -r INVX8 netlist.vg | wc -l
5000

ie there are 5000 instances of the inverter cell.

Now, I load the design in DV and query for the same cells:

dc_shell> sizeof [get_cells * -filter "INVX8"]
2356

Both numbers are different, should these be the same...? :sad:

I am pretty new to synthesis using DC and will appreciate any help here...

Thanks
 

Try adding the -hier switch to your command i.e. get_cells -hier -filter "...
You might have sub modules in your design. Without the -hier switch your search will be limited to the top level.
 
You nailed it..!!

The numbers make more sense now...thanks..!
 

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