Synopsys Timing Constraints And Optimization User Guide 2021 =link= ✮

When reviewing a timing report, look specifically for these structural segments:

Virtual clocks exist only in the timing environment and do not map to a physical port or pin in the netlist. They serve as a reference point for bounding input and output delays.

report_analysis_coverage : Provides a high-level percentage score of how much of your design is meeting its timing requirements. Conclusion synopsys timing constraints and optimization user guide 2021

Signals from configuration registers that only change during boot-up and remain constant during chip operation.

This defines the setup and hold requirements of the external receiving device relative to the reference clock. When reviewing a timing report, look specifically for

, which enables a unified timing analysis engine across synthesis, placement, and routing to ensure timing signoff correlation and reduce iterations. Advanced Timing Analysis All-Aware Analysis

# Apply a 150ps uncertainty for setup constraints on the system clock set_clock_uncertainty -setup 0.150 [get_clocks sys_clk] Use code with caution. 3. Modeling the Real World: Input and Output Delays Advanced Timing Analysis All-Aware Analysis # Apply a

: Input port to the data pin of a sequential element (flip-flop).

The 2021 guide emphasizes a methodical approach to defining the design environment. The constraints are categorized as follows:

Real-world clock networks suffer from physical imperfections. You must model these characteristics explicitly during synthesis before physical layout occurs:

Specifies frequencies, duty cycles, and uncertainties.