Storage device and method of operating the same

A storage device comprising:

• a nonvolatile memory device;
• and
• a storage controller configured to control operations of the nonvolatile memory device, the storage controller comprising:
• a buffer memory configured to temporarily store read data read from the nonvolatile memory device and write data to be written in the nonvolatile memory device;
• a first volatile memory and a second volatile memory included in different power domains;
• a processor configured to generate buffer allocation information on storage regions of the buffer memory and data stored in the storage regions, store the buffer allocation information in the first volatile memory, and control an access to the buffer memory based on the buffer allocation information;
• and
• a buffer context backup circuit configured to perform a context backup operation to read the buffer allocation information from the first volatile memory and store backup information in the second volatile memory when the storage device enters a power down mode, and to perform a context restoring operation to read the backup information from the second volatile memory and store the buffer allocation information in the first volatile memory when the storage device exits from the power down mode,
• wherein the storage controller is configured to perform a data backup operation to read data from the buffer memory and store backup data in the nonvolatile memory device when the storage device enters the power down mode.

A method of operating a storage device, comprising:

• generating buffer allocation information on storage regions of a buffer memory and data stored in the storage regions;
• storing the buffer allocation information in a first volatile memory;
• controlling an access to the buffer memory based on the buffer allocation information;
• performing a context backup operation to read the buffer allocation information from the first volatile memory and store backup information in a second volatile memory when the storage device enter a power down mode;
• performing a context restoring operation to read the backup information from the second volatile memory and store the buffer allocation information in the first volatile memory when the storage device exits from the power down mode;
• and
• performing a data backup operation to read data from the buffer memory and store backup data in a nonvolatile memory when the storage device enters the power down mode.