I am using ModelSim-Altera Edition. The delay information file (.sdo file) output by Quartus II is a Max/Min sdo file, but is it possible to combine these files into one to generate a standard delay format file?

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I am using ModelSim-Altera Edition. In the delay information files (.sdo files) output by Quartus II, Max/Min sdo files are generated. Is it possible to combine these files into one and generate a standard delay format file?

Yes. It is possible.
It can be generated by running tcl Script from the command prompt.

Creates a standard delay format output (.sdo) file containing minimum and maximum timing numbers from separate minimum and maximum timing SDO files generated by the Quartus II software.

The tcl file (combine_sdo.tcl) is available at the link below.

https://www.altera.com/support/support-resources/design-examples/design-software/tcl/tcl-sdo-combine...

The generation method is shown below.

a)	Store the tcl file obtained from the above URL in the same directory as the sdo file
b)	Open a command prompt and go to the directory of the sdo and tcl files
c)	Execute the following command on the command prompt quartus_sh -t combine_sdo.tcl -min_sdo -max_sdo -new_sdo

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