In the world of System-on-Chip (SoC) design, timing is not just a metric; it is the heartbeat of silicon functionality. As process nodes shrink to 7nm, 5nm, and beyond, the complexity of closing timing increases exponentially. For design engineers using Synopsys tools like Design Compiler or IC Compiler, the bible for navigating this complexity has long been the Timing Constraints and Optimization User Guide .
The guide focuses on two primary areas: accurately constraining the design and leveraging tool engines to optimize for Performance, Power, and Area (PPA). :
The guide concludes with a "Best Practices" section, highlighting common errors: synopsys timing constraints and optimization user guide 2021
"Avoid using set_max_delay on a path that already has a clock. This overrides the default setup relationship and usually results in over-optimization, increasing area by 20%."
For internal clock dividers, multipliers, or gated clock networks, use create_generated_clock . This maintains a mathematical relationship with the master clock, allowing the tool to calculate clock latency accurately. In the world of System-on-Chip (SoC) design, timing
Modern designs have multiple operating modes (e.g., turbo mode vs. power-saving mode). Synopsys tools in 2021 allow for , ensuring that fixing a violation in one scenario does not violate timing in another. 4. Best Practices for 2021 Timing Closure
Utilize the comprehensive documentation, online resources, and support channels. 5. Conclusion The guide focuses on two primary areas: accurately
Mastering Synopsys Timing Constraints and Optimization: A Comprehensive Guide (2021/2022 Focus)
Correctly constraining paths that take more than one clock cycle to resolve.
One of the major themes in the 2021 documentation is the reduction of "false violations"—timing violations that aren't actually bottlenecks, often caused by incorrect or incomplete SDC files. Key Optimization Steps
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