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input for generating SDF

gops
What is the input file for generating SDF?In encounter there is a command writesdf.Is SDF calculated based on extracted RC.I mean SPEF file. Please somebody tell me the exact operation running in tool background when i execute writesdf.
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  • write_sdf is most typically run after the design has been timed already which is usually performed with the timeDesign super-command: "timeDesign -postRoute [-si]".  Once the design has been timed, and write_sdf is called the delay calculation in-memory will be used to output the SDF file.  I'm not sure right off whether write_sdf would trigger delay calculation if called on a design that wasn't already timed.  To be safe, I'd recommend calling timeDesign prior to write_sdf.
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  • write_sdf is most typically run after the design has been timed already which is usually performed with the timeDesign super-command: "timeDesign -postRoute [-si]".  Once the design has been timed, and write_sdf is called the delay calculation in-memory will be used to output the SDF file.  I'm not sure right off whether write_sdf would trigger delay calculation if called on a design that wasn't already timed.  To be safe, I'd recommend calling timeDesign prior to write_sdf.
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