Patent ID: 7899960

Claim:
A host device comprising: a reference clock generator configured to generate a read clock; a socket in which a recording card is removably loaded so that a signal can be thereby received and transmitted; a card controller configured to transmit the read clock to the socket and receiving via the socket data transmitted in synchronization with the read clock by the recording card which receives the read clock via the socket; a clock transmission wiring configured to transmit the read clock; and a data transmission wiring configured to transmit the data, wherein the clock transmission wiring comprises: a main transmission wiring configured to transmit the read clock from the card controller to the socket; an outgoing transmission wiring configured to withdraw the read clock from the card controller; and an incoming transmission wiring configured to retrieve the read clock withdrawn from the card controller by the outgoing transmission wiring into the card controller, and a transmission delay amount of the outgoing transmission wiring is set to be equal to a transmission delay amount of the main transmission wiring, a transmission delay amount of the incoming transmission wiring is set to be equal to a transmission delay amount of the data transmission wiring, and the card controller receives the data transmitted by the recording card in synchronization with the read clock retrieved by the incoming transmission wiring.