Synopsys Timing Constraints And Optimization User Guide 2021 [2021] Jun 2026

| Chapter | Focus Area | | :--- | :--- | | | Basic SDC syntax, object lists, attributes, and operating conditions. | | Ch 4-6 | Clock definitions ( create_clock , create_generated_clock ), uncertainty, jitter, and latency. | | Ch 7-9 | I/O constraints ( set_input_delay , set_output_delay ), virtual clocks, and timing exceptions. | | Ch 10-12 | Constraint validation (reporting, check_timing ), debugging methodology, and multi-mode/multi-corner (MMMC) constraints. | | Ch 13-15 | Optimization algorithms for setup, hold, and transition time. | | Appendices | SDC command reference, Tcl examples, and glossary. |

Defining the period, waveform, and source of your primary clocks. synopsys timing constraints and optimization user guide 2021

Before 2021, optimizing for 16 corners meant 16 separate runs. The 2021 guide details how to use to reduce runtime by 40-60%. | Chapter | Focus Area | | :---

Swapping a small, slow cell for a larger, faster one to close a setup violation. Buffer Insertion: Breaking long wires to reduce RC delay. | | Ch 10-12 | Constraint validation (reporting,

Buried in Chapter 6 ("Optimizing for High Speed") is a warning that saves countless ECO cycles:

New in the 2021 context is an expanded focus on and Multi-source Clocks (MSC) . As designs grow larger, traditional H-tree balancing becomes difficult. The guide provides updated commands and attributes for modeling the insertion delay inherent in mesh structures, ensuring that the synthesis engine does not aggressively optimize logic paths that are already balanced by the mesh topology.