1.3. Timing Model Adjustment
To better align the Quartus® II timing models with silicon characterization, Altera recommends adjusting the timing for I/O-to-Core and Core-to-I/O data transfer in MAX® 10 ES devices. For temporary solution, add 300 ps (0.3 ns) clock uncertainty in TimeQuest Timing Analyzer.
To add 300 ps (0.3 ns) clock uncertainty in TimeQuest Timing Analyzer, add the following constraints in the Synopsys Design Constraints File (.sdc):
- set_clock_uncertainty –setup –to <clock name> -setup –add 0.3
- set_clock_uncertainty –hold –enable_same_physical_edge –to <clock name> –add 0.3
For example:
set_clock_uncertainty -to { inst|altpll_component|auto_generated|pll1|clk[1] } -setup 0.3
After adding the .sdc file constraint, a clock uncertainty row is added in Data Required Path in the timing report.