Storage device providing direct memory access, computing system including the storage device and operating method of the storage device

An operating method of a storage device comprising a plurality of non-volatile memory devices, the operating method comprising:

• generating a first command for performing a first DMA operation and a second command for performing a second DMA operation;
• adjusting an output time interval between a first output time point of the first command with respect to a first non-volatile memory device among the plurality of non-volatile memory devices connected to an identical channel and a second output time point of the second command with respect to a second non-volatile memory device among the plurality of non-volatile memory devices;
• and
• adding a time interval corresponding to the output time interval, between an end time point of the first DMA operation corresponding to the first command and a start time point of the second DMA operation corresponding to the second command.

A computing system comprising:

• a host;
• and
• a storage device configured to store data according to a control by the host,
• wherein the storage device comprises:
• a memory controller;
• a buffer memory;
• and
• a memory device comprising a plurality of non-volatile memory devices connected to the memory controller via an identical channel, wherein each of the plurality of non-volatile memory devices comprises a memory bank and a page buffer,
• wherein the memory controller comprises a direct memory access (DMA) engine configured to perform a DMA operation of transferring data from the buffer memory to the plurality of non-volatile memory devices or transferring data from the plurality of non-volatile memory devices to the buffer memory, and
• wherein the memory controller is further configured to:
• generate a first command for performing a first DMA operation and a second command for performing a second DMA operation;
• adjust an output time interval between a first output time point of the first command with respect to a first non-volatile memory device among the plurality of non-volatile memory devices and a second output time point of the second command with respect to a second non-volatile memory device among the plurality of non-volatile memory devices, and
• add a time interval corresponding to the output time interval between an end time point of the first DMA operation corresponding to the first command and a start time point of the second DMA operation corresponding to the second command.