assign bf_out = (ctr0_slect = 1'b1 && ctr0_RW = 1'b0)?(rd_bk = 1'b1 && ctrl_data[4] = 1'b0?
status_latch:[5:4]ctrl_data = 2'b01?OLl:[5:4]ctrl_data = 2'b10?OLm:[5:4]ctrl_data = 2'b11??...