Are you integrating scan chains?
Inputs Outputs +-----------------------+ +-----------------------+ | RTL Code (.v, .sv) |--+ +--> Gate Netlist (.v) | +-----------------------+ | | +-----------------------+ | +----------------+ | +-----------------------+ +-->| |---+ +-----------------------+ | Target Libs (.db) |----->| Design Compiler|----->| SDC Constraints | +-----------------------+ +-->| |---+ +-----------------------+ | +----------------+ | +-----------------------+ | | +-----------------------+ | Constraints (.sdc) |--+ +--> Design Reports (.txt)| +-----------------------+ +-----------------------+ 2. Directory Structure and Environment Setup
command to trigger advanced optimizations, including boundary optimization and register retiming. Analyze Results: Generate reports using report_timing report_area report_power to verify if your constraints were met. Pro Tip: Topographical Mode One of the standout features in recent versions is DC Topographical
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mkdir synthesis cd synthesis mkdir rdl netlist scripts reports work Use code with caution. The .synopsys_dc.setup file
Mastering the is a cornerstone skill for any VLSI or ASIC design engineer. As you have seen, a typical flow involves environment setup, RTL reading, constraint specification, compilation, and thorough analysis. The real power of DC lies not in a single command but in the skillful application of a structured flow combined with meticulous, context-aware constraints . The learning resources and labs from 2021 continue to provide an excellent foundation, and modern scripting techniques allow you to master this complex tool in an automated, reproducible, and verifiable manner.
By using compile_ultra in topographical mode (or simply using DC-G's default flow), you provide a floorplan to DC. The tool then performs "virtual routing" to estimate net delays far more accurately. This results in a netlist with timing and area within ~5% of the final placed design, significantly reducing iterations between synthesis and layout.
# 1. Define the primary clock (Target: 500 MHz -> 2.0 ns period) create_clock -name sys_clk -period 2.0 [get_ports clk] # 2. Model clock network imperfections set_clock_uncertainty 0.15 [get_clocks sys_clk] set_clock_transition 0.08 [get_clocks sys_clk] set_clock_latency 0.3 [get_clocks sys_clk] # 3. Define Input and Output Delays (Assuming 40% setup budget for external logic) set_input_delay 0.8 -clock sys_clk [remove_from_collection [all_inputs] [get_ports clk]] set_output_delay 0.8 -clock sys_clk [all_outputs] # 4. Environment Modeling (Drive strength and capacitive load) set_driving_cell -lib_cell BUFX2 -pin Y [remove_from_collection [all_inputs] [get_ports clk]] set_load 0.05 [all_outputs] # 5. Operating Conditions set_operating_conditions -max tt_1v0_25c Use code with caution. 5. Synthesis Execution and Optimization
Combine all individual workflow steps into a unified, reusable Tcl script. Save this block as scripts/synthesis.tcl .
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Synthesis follows four primary stages: , Apply Constraints , Optimization , and Reporting . Step 1: Analyze & Elaborate
Before launching the tool, you must configure your environment and setup files.
Includes the target library plus any pre-compiled macros or memory.
Now, let's walk through the in DC.
dc_shell> link dc_shell> check_design