Skew Definition - 2022.2 English

Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906)

Document ID
UG906
Release Date
2022-10-19
Version
2022.2 English

Clock skew is the insertion delay difference between the destination clock path and the source clock path: (1) from their common point in the design; (2) to, respectively, the endpoint and startpoint sequential cell clock pins.

In the equation below:

  • Tcj is the delay from the common node to the endpoint clock pin.
  • Tci is the delay from the common node to the startpoint clock pin:
    Tskewi,j = Tcj- Tci