The greatest leap in synthesis accuracy comes with , as implemented in DC Graphical. Unlike classic synthesis, which estimates interconnect delays using wire load models, physical synthesis uses physical guidance .

set_wire_load_model -name "TSMC28nm_Conservative" -library tcbn28hpc

The design link step cannot find a sub-module or cell macro definition.

Synopsys Design Compiler 2021 remains the gold standard not because of revolutionary changes, but due to its relentless refinement of and automation . The tutorial above—from read_verilog to write_sdc —can be templated for any ASIC project.

Here are the critical variable definitions you will set in your setup file:

DC 2021 can read a preliminary floorplan to estimate routing congestion.

Design Compiler operates in two primary execution modes depending on your automation and visualization requirements. Command Line Mode (Recommended for Automation) Execute synthesis non-interactively using a Tcl script:

: Defines the directories where Design Compiler looks for source files, design libraries, and script files.

############################################################################### # Automation Script: Synopsys Design Compiler Synthesis Flow ############################################################################### # 1. Environment Setup (Fallbacks if .synopsys_dc.setup is missing) set_app_var search_path [list . ./rtl ./libs/db $search_path] set_app_var target_library tsmc65nm_ss_0v9_125c.db set_app_var link_library * tsmc65nm_ss_0v9_125c.db # Create output directories file mkdir ./WORK ./reports ./outputs define_design_lib WORK -path ./WORK # 2. Design Ingestion analyze -format systemverilog core.sv peri.sv top.sv elaborate top current_design top # 3. Reference Linking Diagnostics link if [check_design] == 0 echo "Design Check Failed!" # 4. Apply Constraints create_clock -name sys_clk -period 5.0 [get_ports clk] set_clock_uncertainty 0.25 [get_clocks sys_clk] set_input_delay -max 1.2 -clock sys_clk [remove_from_collection [all_inputs] [get_ports clk]] set_output_delay -max 1.0 -clock sys_clk [all_outputs] set_load 0.02 [all_outputs] set_max_area 0 # 5. Core Engine Compilation compile_ultra -boundary_optimization # 6. Housekeeping and Clean Reports Generation report_design > reports/design_summary.rpt report_area -hierarchy > reports/area_hierarchy.rpt report_timing -delay_type max -max_paths 5 > reports/timing_worst_setup.rpt report_constraint -all_violators > reports/constraints_violators.rpt # 7. Write Results For P&R Flow write -format verilog -hierarchy -output outputs/top_gate.v write_sdc outputs/top.sdc echo "--- Logic Synthesis Run Executed Successfully ---" exit Use code with caution.