MEMORY CARD SYSTEM, METHOD TRANSFERRING DATA THEREOF, AND SEMICONDUCTOR MEMORY DEVICE

摘要

A memory card system, a data transmitting method of the memory card system, and a semiconductor memory device are provided to transmit data to a host in synchronization with a read clock signal generated by an internal clock generator of a memory card to maintain a set-up time margin sufficient for a read operation. A memory card system(200) includes a host(210) and a memory card(220). The host generates a read command. The memory card generates an internal read clock signal in response to the read command and transmits data to the host in synchronization with the read clock signal. The memory card includes a read clock generator(224) for generating the read clock signal. The host includes a write clock generator. When the host stores data in the memory card, the memory card stores the data in synchronization with the write clock signal generated by the write clock generator.