: Techniques for gate-to-gate area reduction and critical path optimization to meet Quality of Results (QoR). 2. Best Practices for Implementation
This guide is deeply integrated with the format—an industry-standard, TCL-based language used to communicate design intent regarding timing, power, and area across Synopsys tools like Design Compiler, IC Compiler, and PrimeTime.
A design does not exist in a vacuum; it must communicate with external components. Synopsys tools need to know how much time is consumed outside the chip boundaries to optimize the internal logic paths accurately. synopsys timing constraints and optimization user guide 2021
The tool spends days trying to fix timing between asynchronous domains, ignoring real violations. report_clock_groups Key Diagnostic Commands to Remember
Used when a combinational data path intentionally takes more than one clock cycle to stabilize. A classic example is a complex floating-point multiplier unit. : Techniques for gate-to-gate area reduction and critical
When evaluating a report_timing output, inspect these critical metrics:
If certain paths are never active, explicitly define them to prevent false violations. A design does not exist in a vacuum;
Do not blindly apply all optimizations. Choose techniques specific to the path's bottleneck (e.g., logic delay vs. wire delay).
The user guide includes a new Appendix C: "Top 20 Timing Constraint Mistakes and Fixes."
Strict limits set by the foundry that override timing optimization.
Converts logic into a sum-of-products format, removing intermediate structures to maximize speed at the expense of area. 6. Environmental and Physical Constraints