How sdc affect the sdf

[qqxiu]

Hi all,

After APR, i used Primetime to generate the sdf file for postsim.
It seems that we need to prepare the sdc file to generate the sdf file.
In my design, i have different mode, so i have different sdc file.
I wondering that what kind of the sdc that is needed to generate a reliable sdf ?
Hope someone can point out that something that i misunderstood.

 

[ThisIsNotSam]

You always need at least one SDC to model clocks, input/output relationships, and a lot more. it is not that the SDF relies on the SDC file directly. Everything during the place and route phase relies on the SDC. It is mandatory.

 

[qqxiu]

You always need at least one SDC to model clocks, input/output relationships, and a lot more. it is not that the SDF relies on the SDC file directly. Everything during the place and route phase relies on the SDC. It is mandatory.

Hi ! Thanks to your reply.
I was wondering if it is OK to provide less constraints in generating SDF.
For example, we need to eliminate the set_case_analysis constraint.
I want to know that which constraint should not be reduce in generating SDF.

 

[ThisIsNotSam]

depending on what your set_case_analysis is, you would generate two SDFs, one for mode A and one for mode B.