How to control transition and skew during CTS?

oTransition Time (Slew):

  • Set a max_transition constraint. tool will automatically insert buffers as needed to ensure no segment of the clock tree exceeds this targeted trans limit.
  • Skew:
  • Set a target skew limit. tool will use this as a target for balancing.
  • Clock mesh or multi tap CTS instead of a conventional tree, or building a well-balanced H-tree, can control skew.
  • Using NDRs with wider wires reduces RC variation, which helps minimize skew.
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