- Compare I/O reports between the two runs. Review I/O placement and I/O standards. Confirm all I/Os are placed.
- Search for I/Os without fixed placement.
- If clock skew differs between runs, reuse clock primitive placement from the
timing-closed run. Use the Clock Utilization Report to locate clock tree drivers.
Copy LOC constraints into your XDC file.
- Consider reusing placement of Block RAMs and DSPs by using to list the instances.