assert bidir bits buried case clique connected_pins constant defaults define design device else elsif for function generate gnd help_id in include input is machine node of options others output parameters returns states subdesign then title to tri_state_node variable vcc when with carry cascade dffe dff exp global jkffe jkff latch lcell mcell memory opendrn soft srffe srff tffe tff tri wire x not and nand or nor xor xnor mod div log2 used ceil floor