Patent ID: 8526267

Claim:
An electronic device comprising: a substrate having a plurality of first terminals formed in a first semiconductor component mounting region, a plurality of second terminals formed in a second semiconductor component mounting region, and transmission paths coupling the first terminals and the second terminals, respectively; a first semiconductor component mounted in the first semiconductor component mounting region; and a second semiconductor component mounted in the second semiconductor component mounting region, wherein the second semiconductor component has plurality of memory devices operated in synchronization with a clock signal, wherein the first semiconductor component has a memory controller controlling the second semiconductor component, wherein the transmission paths include a clock transmission path to supply the clock signal from the first semiconductor component to the second semiconductor component, a command/address transmission path to supply a command and address signal from the first semiconductor component to the second semiconductor component, a data system transmission path to transmit data between the first semiconductor component and the second semiconductor component, and a first control system transmission path to transmit a first control system signal to indicate the validity of the clock signal and the command and address signal from the first semiconductor component to the second semiconductor component, wherein the substrate further has a ground plane, a first specific transmission path branching from the middle of the first control system transmission path and reaching the ground plane, and a first capacitor element arranged in series with the first specific transmission path, and wherein the first capacitor element has a capacitance value greater than a parasitic capacitance of a path from the proximal end in the direction of signal transmission of the first control system transmission path to the branching point to the first specific transmission path.