DATA MEMORY DEVICE

摘要

In the present invention, a data memory device is provided with: a memory medium that stores data; a command buffer that stores commands instructing transfer of data generated by an external device; and command transfer Direct Memory Access (DMA), transfer list generation DMA, and data transfer DMA that are respectively connected to the external device and are hardware circuitries. The command transfer DMA acquires a command from the memory of the external device; acquires the contents of the command instructions; stores the command in a command buffer and acquires a command number identifying an in-process command; and sends the command number in accordance with the contents of the command instructions thereby starting up the transfer list generation DMA. The transfer list generation DMA identifies the address of memory serving as the target of data transfer with the external device, on the basis of the command stored in the command buffer, and sends the address to the data transfer DMA thereby starting up the data transfer DMA. The data transfer DMA transfers the data to memory on the basis of the address.