Output Delay - 2023.2 English

Vivado Design Suite User Guide: Using Constraints (UG903)

Document ID
UG903
Release Date
2023-11-01
Version
2023.2 English

The set_output_delay command specifies the output path delay of an output port relative to a clock edge at the interface of the design.

Video: For training on output delay, see the Vivado Design Suite QuickTake Video: Setting Output Delay.

When considering the application board, this delay represents the phase difference between:

  1. The data propagating from the output package pin of the FPGA, through the board to another device, and
  2. The relative reference board clock.

The output delay value can be positive or negative, depending on the clock and data relative phase outside the FPGA.

Note: Output delays can also be set on internal data pins such as, STARTUPE3/DATA_OUT[0:3] (UltraScale+ devices).