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Clock grouping techniques/ methodology

Rajesh Vembu

Hi,

Can someone share  some of the techniques used in identification of clock groups for balancing skew during CTS?

Thanks

Rajesh 

Parents

  •  you are asking a very general question.  There is no single CTS technique/flow that solve all the clock skew problem.  First thing, do you really care about the clock skew if your design meet timing with OCV.  If you do, you better know which group of flops should have very tight skew (get your RTL designers involve).  If you don't know you clock tree structure, you can use "clockDesign -check" to report the clock tree structures (after you load in the clock spec file) and get some insight info on why simple/complex is the design clock tree.  Always start with the tool default flow and then fine tune the clock SPEC to get the result you want.

     

    li siang

     

Reply

  •  you are asking a very general question.  There is no single CTS technique/flow that solve all the clock skew problem.  First thing, do you really care about the clock skew if your design meet timing with OCV.  If you do, you better know which group of flops should have very tight skew (get your RTL designers involve).  If you don't know you clock tree structure, you can use "clockDesign -check" to report the clock tree structures (after you load in the clock spec file) and get some insight info on why simple/complex is the design clock tree.  Always start with the tool default flow and then fine tune the clock SPEC to get the result you want.

     

    li siang

     

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