The object of the invention is to avoid an unselected data line being driven in a memory array composed of memory cells each of which uses a storage element depending upon variable resistance and a selection transistor when the selection transistors in all memory cells on a selected word line conduct. The inner magnetic layer may be formed by an action of chemical bond or van der Waals force. The invention allows the gateway to handle errors for devices such as streaming and message servers that have no built-in error handling. The floor strip has a tab portion on a surface that engages a channel on a floor tile or a reducer. The fixing frame has a connecting end and a fixing end opposite to each other, the fixing frame is disposed on the main board via the connecting end and the fixing end is protruded outside the edge.