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About compile_ultra and compile_ultra -incr

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hjacky

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Hi,

Does someone know the difference between the following flow in Design Compiler:

Flow 1: Netlist+sdc -> compile_ultra -> compile_ultra -incr -> final_compile_1.ddc
Flow 2: Netlist+sdc -> compile_ultra -> initial_compile.ddc -> compile_ultra -> final_compile_2.ddc

Thanks,
 

I don't understand the 2nd flow. Why are you running compile_ultra 2 times?
 

For the second flow, after i generated a ddc file from DC, i can use the ddc to generate DEF/FP files in ICC, then i can use the def and former ddc files as input data into DC (one of Design compiler topographical feature).
 

Understood. That means in the 2nd case, you are invoking DC twice(one without def and one with def). The 2nd one yields more accurate results. I don't know of any other difference.
 

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