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Regarding Constraint file generation

Music

Hi..

 How can i generate a constraint file for my design?

How is it possible to generate design.constr  if my design has clock in it?

how is it possible to generate design.constr if my design doesnt have any clock ?

 please help me.....

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  • Hi There Music, A constraint file, aka an SDC file, is generally hand generated using a editor for the synthesis process, and then passed to place & route team. There are also cases where they are generated just for the place and route process, where they are again hand generated in an editor. A clock constraint has this syntax : create_clock -period period_value [-name clock_name] [-waveform edge_list] [-add] [sources] You can find the full definition of this constraint, as well as other design constraints in the Encounter Test Command Reference Chapter 30, "Timing Constraint Commands". If your design does not have a need for a clock, then it is not necessary for there to be a constraint. If I may, What is driving you to generate design.constr? Hope this helps, Brad Tree

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  • Hi There Music, A constraint file, aka an SDC file, is generally hand generated using a editor for the synthesis process, and then passed to place & route team. There are also cases where they are generated just for the place and route process, where they are again hand generated in an editor. A clock constraint has this syntax : create_clock -period period_value [-name clock_name] [-waveform edge_list] [-add] [sources] You can find the full definition of this constraint, as well as other design constraints in the Encounter Test Command Reference Chapter 30, "Timing Constraint Commands". If your design does not have a need for a clock, then it is not necessary for there to be a constraint. If I may, What is driving you to generate design.constr? Hope this helps, Brad Tree

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