read_verilog dpram.v
hierarchy -top top
proc
memory -nomap
equiv_opt -run :prove -map +/ice40/cells_sim.v synth_ice40
memory
opt -full

miter -equiv -flatten -make_assert -make_outputs gold gate miter
sat -verify -prove-asserts -seq 3 -set-init-zero -show-inputs -show-outputs miter

design -load postopt
cd top
select -assert-count 1 t:SB_RAM40_4K
select -assert-none t:SB_RAM40_4K %% t:* %D