Don't read it front to back. Do this instead:
When evaluating a report_timing output, inspect these critical metrics:
# Define a divide-by-2 clock generated at the output of a flip-flop create_generated_clock -name DIV_CLK \ -source [get_ports sys_clk] \ -divide_by 2 \ [get_pins clk_div_reg/Q] Use code with caution. Virtual Clocks
Do you need to know about a specific Synopsys tool like or PrimeTime ? Share public link synopsys timing constraints and optimization user guide 2021
: Splitting long, highly loaded wires to clean up slow signal transition times (slew).
To prevent the optimization engine from over-restructuring logic that requires precise physical placement, use preservation commands.
Understanding the Synopsys Timing Constraints and Optimization User Guide 2021 Don't read it front to back
. While the exact chapter numbering can vary slightly between tool releases (e.g., version R-2020.09 vs. S-2021.06), the core content structure remains consistent.
Generated clocks are derived from master clocks inside the design via clock dividers, multipliers, or gating logic. It is vital to define them using the -source flag so the timing engine can accurately trace phase relationships and clock latency.
This guide is structured to support the entire chip implementation process, as detailed in the table below: Share public link : Splitting long, highly loaded
set_output_delay -max 0.5 -clock SYS_CLK [get_ports data_out] set_output_delay -min -0.2 -clock SYS_CLK [get_ports data_out] Use code with caution. 5. Advanced Timing Exceptions
: Identifies which specific gate or net is introducing the largest propagation delay.
: Completing port constraints with drive strength and load information. 4. Timing Exceptions False Paths