12.3. SDC Timing Constraints
Your top-level Synopsys Design Constraints file (.sdc) must include the following timing constraint macro for the Intel® Arria® 10 or Intel® Cyclone® 10 GX Hard IP for PCIe IP core.
SDC Timing Constraints Required for the Intel® Arria® 10 or Intel® Cyclone® 10 GX Hard IP for PCIe and Design Example
# Constraints required for the Hard IP for PCI Express # derive_pll_clock is used to calculate all clock derived # from PCIe refclk. It must be applied once across all # of the SDC files used in a project derive_pll_clocks -create_base_clocks
You should only include this constraint in one location across all of the SDC files in your project. Differences between Fitter timing analysis and Timing Analyzer timing analysis arise if these constraints are applied multiple times.