A lower double-joint front suspension system is provided which includes an upper suspension link and a pair of lower suspensions links for supporting a front wheel. An electronic device provides an output signal to indicate that movement of the pump plunger has stopped at the end of the pumping stroke, and a timer determines a time difference between the input signal being supplied to the solenoid and the output signal being output by the electronic device. In a fractional-bit system, cells are decoded in unit of word. The memory module including at least one memory device and at least one connector for connecting a memory extension memory module to the memory module, wherein the at least one memory device and the at least one connector are connected to the memory module in a single manufacturing process.