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+read_verilog adffs.v
+proc
+async2sync # converts async flops to a 'sync' variant clocked by a 'super'-clock
+flatten
+equiv_opt -assert -map +/ecp5/cells_sim.v synth_ecp5 # 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 4 t:TRELLIS_FF
+select -assert-count 7 t:LUT4
+select -assert-none t:TRELLIS_FF t:LUT4 %% t:* %D