| 摘要 |
PURPOSE: A semiconductor memory device, a data transfer device, and a method of controlling semiconductor memory device are provided to improve data transfer efficiency by using a RAM as a data transmission cache between a host device and a NAND memory, a data transfer device. CONSTITUTION: An SSD and a host device(200) are connected by a communication interface of the ATA standard. Upon receipt of a data read request from the host device, the SSD transmits read-requested data to the host device. The read request received by the SSD from the host device includes read-destination address information and the size of the read-requested data. The read-requested data is one file, for example, and data having a size corresponding to the size of the file is requested to read. The SSD includes a data transfer device(10) and a NAND memory(20). Reading of data from the NAND memory is executed for each predetermined unit size. The unit size is equal to a page unit being a collective write unit or a collective read unit of the NAND memory, for example. The page unit, which differs in size depending on each product, has sizes of 2 kilobytes, 4 kilobytes, or 8 kilobytes, for example. Based on the address information and the size of the data included in the read request received from the host device, the data transfer device 10 obtains an address in the NAND memory of the unit-sized data configuring the read-requested data, reads the unit-sized data from the NAND memory based on the obtained address, and transfers the data to the host device.
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