A memory module, comprising: a first pin, arranged to receive a first signal; a second pin, arranged to receive a second signal; a first conducting path, having a first end coupled to the first pin; at least one memory chip, coupled to the first conducting path for receiving the first signal; a predetermined resistor, having a first terminal coupled to a second end of the first conducting path; and a second conducting path, having a first end coupled to second pin for conducting the second to a second terminal of the predetermined resistor; wherein the first signal and the second are synchronous and configured to be a differential signal, for enabling a selected memory chip from the at least one memory chip to be accessed.