Storage device, storage system and operating method of the same using memory buffer

A storage system comprising:

• a host comprising a host memory storing index information on a physical address and a host processor outputting a command and a virtual address;
• and
• a storage device sharing the index information in advance and transmitting data according to the command to the host memory together with an indicator according to the index information in accordance with a direct memory access operation, and comprising:
• an address translation cache translating the virtual address to the physical address of a host specific memory buffer (SMB);
• a SMB manager requesting memory access to the virtual address when a cache miss occurs in the address translation cache;
• a direct memory access manager performing an access operation for the host SMB together with the virtual address upon receiving the memory access request from the SMB manager;
• a device specific memory buffer (SMB) storing the index information shared in advance;
• and
• a device completion manager transmitting a completion queue, which comprises the indicator, when the access operation of the direct memory access manager is completed.

An operating method of a storage device, the operating method comprising:

• performing direct memory access to a host together with a virtual address when a cache miss for the virtual address occurs in an address translation cache;
• requesting memory access to the virtual address when the cache miss occurs;
• performing an access operation for a host specific memory buffer (SMB) together with the virtual address upon receiving the memory access request;
• mapping the virtual address to an indicator of index information stored on the host SMB and storing the mapped virtual address upon the memory access request;
• and
• outputting a completion queue, which comprises an indicator corresponding to the virtual address, to the host, when the access operation for the host SMB is completed.