Controller, memory system including the same, and method of operating the memory system

A memory system comprising:

• a memory device configured to store data, read stored data and output read data;
• a buffer memory configured to store read data received from the memory device;
• and
• a controller configured to control the memory device such that the memory device performs a read operation in response to a read request received from a host,
• wherein the controller comprises:
• a processor configured to generate the internal command by parsing the read request, and generate a command queue by queuing the generated internal command;
• a flash control circuit configured to output a memory command to the memory device in response to the command queue;
• and
• a subsidiary buffer control circuit configured to allocate, when the internal command is an asynchronous read command corresponding to an asynchronous read operation as the read operation, storage space for storing the read data to the buffer memory after the memory device completes the asynchronous read operation in response to the memory command.

A method of operating a memory system, comprising:

• parsing, when a read request is received from a host, the read request, and generating an internal command;
• outputting, when the internal command is an asynchronous read command, the asynchronous read command to the memory device;
• performing, by the memory device, an asynchronous read operation in response to the asynchronous read command;
• allocating storage space for storing read data that is read from the memory device to a buffer memory after the memory device completes the asynchronous read operation;
• receiving the read data from the memory device and storing the read data in the allocated storage space of the buffer memory;
• and
• outputting the read data stored in the allocated storage space to the host.

A controller comprising:

• a processor configured to parse a read request received from a host, queue an internal command, and generate a command queue;
• a buffer memory configured to store read data received from a memory device, and output the stored read data to the host;
• and
• a buffer memory control circuit configured to allocate, when the internal command corresponds to an asynchronous read operation, storage space for storing the read data to the buffer memory after the asynchronous read operation of the memory device is completed.