Synopsys Design Compiler Tutorial -
compile_ultra
create_clock -period 10 [get_ports clk] set_input_delay 2 -clock clk [all_inputs] set_output_delay 2 -clock clk [all_outputs] synopsys design compiler tutorial
check_design list_designs Clock create_clock -name clk -period 10.0 [get_ports clk] set_clock_uncertainty -setup 0.5 [get_clocks clk] set_clock_transition 0.3 [get_clocks clk] set_clock_latency 0.8 [get_clocks clk] Input/Output Delays set_input_delay -max 2.5 -clock clk [all_inputs] set_output_delay -max 1.8 -clock clk [all_outputs] remove_input_delay [get_ports clk] # exclude clock port Input transition & output load set_input_transition 0.2 [all_inputs] set_load 0.05 [all_outputs] Timing exceptions (solid for real designs) set_false_path -from [get_ports test_mode*] set_multicycle_path -setup 2 -hold 1 -through [get_pins slow_cell/Q] 4. Compile (Synthesis) Basic compile compile_ultra # strongly recommended over old "compile" Area optimization compile_ultra -area_high_effort Power optimization set_power_optimization true compile_ultra -gate_clock Incremental (small improvements) compile_ultra -incremental 5. Check Quality of Results # Timing report_timing -delay_type max -nworst 10 report_timing -delay_type min # for hold Area report_area -hierarchy Power (if power analysis enabled) report_power -analysis_effort high Constraints coverage check_timing report_clock -attributes 6. Save Results # Netlist write -format verilog -hierarchy -output mapped/design.vg Standard Delay Format (SDF) for post-synthesis sim write_sdf -version 2.1 mapped/design.sdf Constraints (output final constraints) write_script -output mapped/design_cons.tcl Report timing in a file redirect -tee -file reports/timing.rpt report_timing -delay_type max 7. Full Example Script (solid foundation) # synth.tcl set SSLIB "saed90nm_typ.db" set target_library $SSLIB set link_library [list "*" $SSLIB] read_verilog rtl/top.v rtl/alu.v rtl/ctrl.v current_design top link check_design Save Results # Netlist write -format verilog -hierarchy
