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setup violation

PhilBzh

 Hi,

 I can't solve a problem with a lot of setup violation. Even if I run optDesign I still have the same huge number of setup violation.

In my, .sdc, I only create the clock and define its period and waveform. Is it enouth ?

I already worked on my .ctsch and it seems to be good.

Has anyone some ideas to solve this problem ? 

 

Phil 

Parents
  • Kari

     Having just a clock definition in the sdc file should work, but for realistic timing analysis, you really should have more than that. At the least, I would think you'd need input/output delays and drive cell assertions. Check out the following blog series for a great tutorial on creating timing constraints:

    http://www.cadence.com/Community/blogs/di/archive/2009/02/09/constraint-construction-what-s-it-s-function-part-1-of-4.aspx

    http://www.cadence.com/Community/blogs/di/archive/2009/02/18/constraint-construction-what-s-it-s-function-part-2-of-4.aspx

    http://www.cadence.com/Community/blogs/di/archive/2009/03/06/constraint-construction-what-s-its-function-part-3-of-4.aspx

    http://www.cadence.com/Community/blogs/di/archive/2009/04/09/constraint-construction-what-s-its-function-part-4-of-4.aspx

    If you post the timing report for your worst path, I might be able to tell a few things.

    - Kari

Reply
  • Kari

     Having just a clock definition in the sdc file should work, but for realistic timing analysis, you really should have more than that. At the least, I would think you'd need input/output delays and drive cell assertions. Check out the following blog series for a great tutorial on creating timing constraints:

    http://www.cadence.com/Community/blogs/di/archive/2009/02/09/constraint-construction-what-s-it-s-function-part-1-of-4.aspx

    http://www.cadence.com/Community/blogs/di/archive/2009/02/18/constraint-construction-what-s-it-s-function-part-2-of-4.aspx

    http://www.cadence.com/Community/blogs/di/archive/2009/03/06/constraint-construction-what-s-its-function-part-3-of-4.aspx

    http://www.cadence.com/Community/blogs/di/archive/2009/04/09/constraint-construction-what-s-its-function-part-4-of-4.aspx

    If you post the timing report for your worst path, I might be able to tell a few things.

    - Kari

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