: Defining primary, virtual, and generated clocks, as well as handling clock groups and latencies.
Converts HDL code into a generic technology-independent netlist (GTECH).
For the physical synthesis flow (IC Compiler), the guide discusses: 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%.
Selecting real target library cells (cells from standard TSMC, Intel, or Samsung foundry kits) to meet constraints. Key Optimization Directives : Defining primary, virtual, and generated clocks, as
Fine-tune constraints to explore trade-offs between performance, power, and area.
# Maximum input delay for setup check (restricts internal time) set_input_delay -max 0.6 -clock SYS_CLK [get_ports IN_DATA] # Minimum input delay for hold check set_input_delay -min 0.2 -clock SYS_CLK [get_ports IN_DATA] Use code with caution. Output Delay Constraints The 2021 guide details how to use to
A data pin of a sequential element or an output port. Setup vs. Hold Constraints
The logic gates and interconnect wires that delay the signal.
Detail the difference between set up and hold time optimization. Give tips for resolving high-fanout net issues. Let me know which topic you'd like to dive into! Synopsys Timing Constraints And Optimization User Guide
Not every path in a chip needs to meet a single-cycle timing requirement. The 2021 guide highlights how to properly use exceptions to prevent the tool from "fixing" paths that aren't broken: