Launch and Capture Edges - 2025.2 English - UG906

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, data transfers between two sequential cells within one clock period:

1. The launch edge occurs at 0 ns.
2. The capture edge occurs one clock period later.

The following section explains how these edges define the setup and hold relationships used in timing analysis.