Input and output delays for a fully combinational path

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Hello,

I am working on a design that consists of fully combinational paths. I have applied timing constraints using the set_max_delay -from x -to y command.

However, I am uncertain whether I also need to specify input and output delays. Since these paths are fully combinational paths and the tool reports that the paths are fully constrained, I have not added any input or output delay constraints. I believe that the set_max_delay constraints alone should suffice in this case.

Could someone confirm if this approach is correct, or if input and output delay constraints are necessary for such designs?
 

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