Synopsys Timing Constraints And Optimization User Guide 2021 Online

For the physical synthesis flow (IC Compiler), the guide discusses:

The guide introduces a "Board-Aware" constraint flow. synopsys timing constraints and optimization user guide 2021

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"When creating a generated clock using create_generated_clock, always specify the -source object as the master clock pin. In 2021, the -divide_by or -multiply_by options are recommended over -edges for simple frequency division to improve propagation accuracy. For non-integer division, use -edge_shift with care, as it may introduce glitches if the source clock edge alignment is not validated." For the physical synthesis flow (IC Compiler), the

This guide explains key Synopsys timing constraint concepts and practical optimization techniques for digital IC design flows circa 2021. It covers SDC fundamentals, constraint types, common pitfalls, strategies for improving timing, and recommended flows for static timing analysis (STA) and synthesis/implementation with Synopsys tools (Design Compiler, PrimeTime, IC Compiler/IC Compiler II). Use this as a practical reference to write or refine constraints and to guide timing closure efforts. If you want, I can:

The 2021 guide introduces a tiered optimization flow:

The 2021 release did not just add new commands; it introduced a philosophical shift: "Shift Left" . Historically, designers wrote loose constraints at the Register Transfer Level (RTL) and tightened them during physical design. The 2021 guide emphasizes signoff-quality constraints at the synthesis stage.

Account for board-level uncertainties and IO timing (driver/receiver delays).

For multi-cycle or launched capture schemes from external interfaces, combine input_delay/output_delay with set_multicycle_path or set_false_path as appropriate.