Comprehensive Guide to Synopsys Timing Constraints and Optimization
One of the most common causes of timing failure is the mishandling of timing exceptions. The user guide dedicates a substantial chapter to set_false_path , set_multicycle_path , and set_max_delay .
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Tip: Use higher uncertainty during early synthesis and tighter, more realistic values during final optimization. 2.4. Exceptions ( set_false_path , set_multicycle_path ) Crucial for non-standard paths.
The 2021 guidelines emphasize that constraints should be . Over-constraining forces the tool to work unnecessarily hard, leading to bloated area and excessive power consumption. Under-constraining, conversely, leads to optimistic results that fail in silicon. 2. Defining the Clock Tree This link or copies made by others cannot be deleted
The tool attempts to meet slack requirements by resizing cells, rebuilding logic, or reordering paths.
: Tools to manage constraints as they move from RTL to gate-level and from IP blocks to the full SoC. Optimization Strategies Adaptive Retiming : Techniques using commands like compile_ultra -retime Try again later
: Swapping High-Threshold Voltage (HVT) cells into non-critical paths to reduce leakage while retaining Low-Threshold Voltage (LVT) cells strictly on critical paths.
: Inclusion of ML-based power recovery and Path-Based Analysis (PBA) to squeeze extra performance and power savings from the design. Multibit Optimization
: set_clock_uncertainty adds margin for jitter and skew, while set_clock_latency models insertion delay.