A traffic control method and device are provided. Each memory cell has a magnetic reference layer and a magnetic data layer. Each of the second transducers in each array of second transducers being aligned with a corresponding one of the first transducers in a direction generally parallel to a path of tape travel thereacross. The traces are disposed between the lid and the active surface of the semiconductor chip, and are electrically connected to the bonding pads. At an activation time, the MPU refers to the logic of the special jumper block to start an operation in the host mode.