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remove inverter pairs from design?

hello people, In velocity tool, I need some help with removing inverter pairs from the design. deleteBufferTree only seems to work on buffers. when I use the -footprint for this option with inverters it does not work. So does anyone know how to remove inverter pairs from the design? Thanks, -Tony

wally1 over 13 years ago

Hi Tony,
You can use "ecoDeleteRepeater -inst inv1 inv2".
Regards,
Brian
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bluebear over 13 years ago

hi Wally1. Thanks for the reply. I looked into this command and it requires me to know the instance names. I should have been more specific. I am looking for a way to globally remove inverter pairs from the design. reason is because this is a netlist coming directly from synthesis where inverter pairs (& buffers) may not be necessary the best option for implementation. thanks, -Tony
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DavidMZ over 13 years ago

Prior to placement you can perform optimizations of your netlist using setOptMode. The -reclaimArea option for exemple is described like this:

-reclaimArea {true | false}

Controls whether timing optimization creates additional space by downsizing gates or deleting buffers, while maintaining worst slack and total negative slack.
Default: false
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wally1 over 13 years ago

You can also run deleteBufferTree to remove buffers/inverter-pairs in the netlist. This is automatically run by placeDesign.
Regards,
Brian
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bluebear over 13 years ago

hi Wally1. deleteBufferTree seems to work (i guess i didn't have as much back to back inverters as i though). thanks again. -Tony
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bluebear over 13 years ago

hi DavidMZ, will give this command a try. Thanks. -Tony
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