This metric provides a better indication of which paths have the most significant impact on the achievable clock frequency, as a path with a 10 ps slack over a 2000 ps allowed delay may be less critical than one with a 5 ps slack over a 100 ps allowed delay. The guide explains how to enable it using two key commands: set_app_var timing_enable_through_paths true and set_app_var timing_enable_normalized_slack true .
: Logic that intentionally takes more than one clock cycle to complete. 2. Static Timing Analysis (STA) with PrimeTime
To model real-world physical constraints like wire resistance, capacitance, and driving strength, apply operating conditions and wire load models. synopsys timing constraints and optimization user guide 2021
Data must travel from point A to point B before the clock ticks again.
Leveraging formal technology allows designers to generate superior SDC quality, resulting in improved Power, Performance, and Area (QoR). Conclusion This metric provides a better indication of which
In the world of digital chip design, timing is everything. The difference between a chip that runs at 2.5 GHz and one that fails at 1 GHz often comes down to the quality of your constraints and the sophistication of your optimization engine. For over three decades, Synopsys has been the gold standard in Electronic Design Automation (EDA). The represents a pivotal release, bridging the gap between legacy static timing analysis (STA) and next-generation physical synthesis.
The guide emphasizes the importance of propagating clock delays for accurate analysis. While initially clocks are ideal, after clock tree synthesis (CTS), you use the set_propagated_clock command to switch to . This results in clock delay being based on actual network parasitics and source latency, rather than a user estimate. While initially clocks are ideal
Not all paths in a design should be analyzed with default single-cycle timing. The 2021 guide provides commands for timing exceptions: