Main target today: Placement and Optimization

Improve timing/qor/congestion… issue with optimization

1.  Pre-placement check

To ensure that there is no issue that prevent place&opt:

Report_qor -summary #A brief view of QoR

Get_flat_nets -quiet -filter is_ideal #clear all ideal nets

Report_ignored_layers #Find maximum routing metal layer

Report_design -summary

Report_utilization

Check-design -checks pre_placement_stage

2.  Pre_placement Setting

#Enable tie cells——get ESD protection enabled and fixed

Set_lib_cell_purpose -include optimization [get_lib_cells $TIE_LIB_CELL_PATTERN_LIST]

Set_dont_touch [get_lib_cells $TIE_LIB_CELL_PATTERN_LIST] false

Set_app_options -list{opt.tie_cell.max_fanout_8}

3.  Pre_optimization Setting

#first confirm at least 1 scenario is enabled(usually there are 4 or more scenarios)

Report_scenario

Set_app_options -name opt.power.mode -value leakage

Set_app_options -name opt.power.mode -value dynamic

Set_app_options -name opt.power.mode -value total

#enable layer optimization

Set_app_options -name place_opt.flow.optimize_layers -value true

#limit maximum density of coarse placement

Set_app_options -name place.coarse.max_density -value 0.7

#ensure default setting of scan chains optimization (scan chain improves hold violation between standard cells) reset_app_options opt.dft.optimize_scan_chain

Set_app_option_value -name opt.dft.optimize_scan_chain

4.  Run Place

#place_opt include 5 phase {initial_plac /initial_drc/initial_opto/final_place/final_opto},command”place_opt”will automatically run the 5 phase sequentially ,also each phase can be run one by one using “place_opt_run_place_opt_phase xx or place_opt -from$xx -to$xx”

Place_opt

5. Once finished

Check legality mv_design

Report qor design summary

Report timing