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 .
set_input_delay -clock sys_clk 0.2 [all_inputs] set_output_delay -clock sys_clk 0.3 [all_outputs] Use code with caution. C. False Paths and Multicycle Paths
: Users are guided on choosing between Graph-Based Analysis (GBA) for speed and Path-Based Analysis (PBA) for higher accuracy during the final signoff stages. 3. Optimization Strategies
If data arrives too fast and mixes with old data, the software adds tiny delays to slow it down. synopsys timing constraints and optimization user guide 2021
A significant portion of the document is dedicated to how Synopsys tools use constraints to physically and logically optimize the netlist.
pt_shell -f design.tcl -o design.rpt
Here are some common commands used to define timing constraints: One of the most common causes of timing
Defining clocks is the single most important step in timing analysis. The guide focuses on the following commands:
Utilizing higher-layer metals for critical, long-distance wires.
Microchips are inside our phones, cars, and computers. Designing these chips is hard work. Engineers must make sure the chip runs fast without errors. Synopsys makes software that helps design these chips. Optimization Strategies If data arrives too fast and
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create_clock -name clk -period 10 -waveform 0 5 set_input_delay -max 3 -clock clk [get_ports input_port] set_output_delay -max 2 -clock clk [get_ports output_port]
Enter the . While it sounds like just another PDF in the $SYNOPSYS/doc folder, this specific 2021 release was a quiet game-changer.
The guide focuses on the creation and application of Synopsys Design Constraints (SDC). SDC is the industry-standard format used to convey the design intent—specifically timing, area, and power requirements—to synthesis and static timing analysis (STA) tools.
Clocks are the heartbeat of any synchronous design. Accurately defining the clock network is the first and most critical step in writing an SDC file. Primary Clock Creation