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how to get a clock timing constraint file for CTS.

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yanzixuan

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can design compiler do this work?
bow
 

No DC will not do this.
This needs to be done by the user. He has to estimate the target skew or uncertainty and give this to the tool.
Normally we go with 10-15 percent clock period as uncertainty. But this depends on the design also.
 

Hi yanzixuan,
Your Question is not clear. Can you please elaborate?

Rgds,
Kumar
 

When you indicate CTS, did you mean for Clock tree Synthesis? In general the tool used the sdc to indicate where is(are) the clock source(s), and analyze the current clock tree to generate the clock tree constrain (in Cadence for example).
is it what you mean?
 

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