About Constraining I/O Delay - About Constraining I/O Delay - 2026.1 English - UG903

Vivado Design Suite User Guide: Using Constraints (UG903)

Document ID
UG903
Release Date
2026-07-01
Version
2026.1 English

To model the external timing context accurately, provide timing information for input and output ports. Because the AMD Vivado™ Integrated Design Environment (IDE) recognizes timing only inside the FPGA, use these commands to specify delays beyond the device:

  • set_input_delay
  • set_output_delay