setup relationship Definition

All timing analysis requires the presence of one or more clock signals. The Timing Analyzer determines clock relationships for all register-to-register transfers in your design by analyzing the clock setup and hold relationship between the launch edge and latch edge of the clock.

The launch edge of the clock signal is the clock edge that sends data out of a register or other sequential element, and acts as a source for the data transfer. The latch edge is the active clock edge that captures data at the data port of a register or other sequential element, acting as a destination for the data transfer.