The disclosed docking systems for an electronic device may provide any accessory function and may include more than one connector such as a battery charger connector, a USB hub, a memory card hub, an audio boom box connector, and the like. A power management circuit determines the state of each of the circuit blocks so as not to exceed a maximum power consumption value of the semiconductor integrated circuit device by considering the power consumption of each circuit block and by each state transition in each circuit block. The contact elements have contact blades which project out of the lower part. A hardware accelerator is generated to perform pipelined processing of instructions.