Synopsys Timing Constraints And - Optimization User Guide 2021 ((full))

: Start with "loose" constraints to explore the design space, then tighten them as the physical floorplan matures.

Timing constraints are the "instructions" that tell synthesis and implementation tools how fast a design must run. Without accurate constraints, optimization results are essentially meaningless.

: Use Synopsys Timing Constraints Manager to catch SDC errors before starting long synthesis runs. synopsys timing constraints and optimization user guide 2021

The user guide outlines several stages of optimization to meet Performance, Power, and Area (PPA) goals.

The 2021 guide emphasizes PrimeTime as the industry "golden" signoff tool. : Start with "loose" constraints to explore the

: Optimizing logic across hierarchical boundaries to remove redundant gates and improve timing.

: Paths that cannot be sensitized or don't need to meet timing (e.g., asynchronous reset synchronizers). : Use Synopsys Timing Constraints Manager to catch

: The primary constraint is create_clock , which defines the period and duty cycle. Secondary clocks, such as generated clocks for frequency dividers, are defined using create_generated_clock .

: Moving registers across combinational logic boundaries to balance path delays without changing the design’s functionality.

: Setup checks ensure data arrives before the next clock edge, while hold checks ensure data remains stable long enough to be captured.