Launch and Capture Edges - 2023.2 English

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

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2023.2 English

When transferring between sequential cells or ports, the data is:

  • Launched by one of the edges of the source clock, which is called the launch edge.
  • Captured by one of the edges of the destination clock, which is called the capture edge.

In a typical timing path, the data is transferred between two sequential cells within one clock period. In that case: (1) the launch edge occurs at 0 ns; and (2) the capture edge occurs one period after.

The following section explains how the launch and capture edges define the setup and hold relationships used for timing analysis.