The final verdict—positive slack means you passed; negative means it's back to the drawing board.
report_timing -delay_type max : Generates the detailed path calculation for your worst setup violations.
In Fusion Compiler, this happens concurrently with placement, fixing setup/hold violations based on real wire length estimations. 3. Best Practices for Creating Accurate SDC Constraints synopsys timing constraints and optimization user guide 2021
: Newer versions emphasize a "four-step" or "sign-off" approach to verify and manage constraints early in the design cycle to prevent silicon failure. Troubleshooting Depth
set_clock_transition 0.08 [get_clocks SYS_CLK] set_clock_latency -source 0.4 [get_clocks SYS_CLK] Use code with caution. 4. Constraining Input and Output Interfaces this happens concurrently with placement
[ External Device ] ------> ( Input Port ) ------> [ Internal Register ] |<-- Input Delay -->| |<-- Internal Path -->| Input Delay Constraints ( set_input_delay )
An ASIC or FPGA design is divided into four distinct categories of timing paths: synopsys timing constraints and optimization user guide 2021
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
Essential for clock dividers or PLL outputs. It ensures the tool understands the phase relationship between the master clock and its derivatives.