220.127.116.11. I/O Timing Constraints
The I/O paths that do not meet the required timing performance are reported as having negative slack and are highlighted in red in the Timing Analyzer Report pane. In cases where you do not apply an explicit I/O timing constraint to an I/O pin, the Intel® Quartus® Prime timing analysis software still reports the Actual number, which is the timing number that must be met for that timing parameter when the device runs in your system.
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