| read_verilog shifter.v | |
| hierarchy -top top | |
| proc | |
| flatten | |
| equiv_opt -assert -map +/ice40/cells_sim.v synth_ice40 # equivalency check | |
| design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design) | |
| cd top # Constrain all select calls below inside the top module | |
| select -assert-count 8 t:SB_DFF | |
| select -assert-none t:SB_DFF %% t:* %D |