Description
Arria® 10 designs require strict adherence to the transceiver guidelines. For this reason derive_pll_clocks has been removed from the generated altpcied_a10.sdc. This file previously contained the following lines:
# derive_pll_clock is used to calculate all clock derived from PCIe refclk
# the derive_pll_clocks and derive clock_uncertainty should only
# be applied once across all of the SDC files used in a project
derive_pll_clocks -create_base_clocks
derive_clock_uncertainty
Resolution
The above lines must now be included in your user created top level SDC. Please be sure to include those two lines.
derive_pll_clocks -create_base_clocks
derive_clock_uncertainty