dc_shell -f run_synthesis.tcl | tee logs/synth_2021.log
The logic synthesis workflow follows six core steps. You can execute these commands interactively inside the dc_shell environment.
: Converts RTL descriptions into an internal, technology-independent format (GTECH library).
Check report_timing -path full -delay max and review constraints. High Area: Reduce set_max_area or optimize the RTL. Conclusion synopsys design compiler tutorial 2021
echo "Starting compile_ultra at [date]" compile_ultra -timing_high_effort -area_high_effort echo "Synthesis finished at [date]"
read_verilog [glob ./rtl/*.v] # Or, for VHDL: analyze -format vhdl file1.vhd file2.vhd elaborate top_module current_design top_module link Use code with caution. Phase 2: Apply Constraints
# Create clock on port 'clk' create_clock -name "core_clk" -period 2.0 [get_ports clk] dc_shell -f run_synthesis
# Map and optimize the design into gate-level primitives compile_ultra Use code with caution. Step 5: Export Synthesis Outputs
You must verify that your design meets all target requirements before proceeding to layout. Generate reports to analyze the timing, area, and power metrics.
Create a constraints script (e.g., constraints.tcl ) containing your design rules: Check report_timing -path full -delay max and review
Assume a 500 MHz clock (2ns period) with 50ps uncertainty.
write -format verilog -hierarchy -output $db_dir/$DESIGN_NAME_netlist.v
It is highly recommended to use ( compile_ultra -topographical ). By using a physical technology library (floorplan information), it offers near-perfect correlation with Place and Route tools (ICC2) regarding timing and area, reducing iterations. 4.2 Power Optimization (Low Power Flow) DC 2021 supports advanced power optimization: Clock Gating: Automatically inserted by compile_ultra .