Data storage apparatus with nonvolatile memories and method for controlling nonvolatile memories

A memory control apparatus comprising:

• a write command module configured to process write commands in a buffer memory for writing data to nonvolatile memories associated with a plurality of channels, the write commands including write commands for a read moth write (RMW) operation;
• a read command module configured to process normal read commands and to process read commands for the RMW operation;
• and
• a controller configured to control the write command module and the read command module,
• wherein the controller is configured to:
• control the read command module, causing to process the read commands for the RMW operation prior to all the normal read commands in processing a flush command for a write flush process,
• store the write commands for the RMW operation in the buffer memory after the read commands for the RMW operation have been processed, and
• control the write command module, causing to perform the write flush process including processing of all write commands in the buffer memory, the all write commands including the write commands for the RMW operation.

A method of controlling nonvolatile memories associated with a plurality of channels by a memory controller in a data storage apparatus, the method comprising:

• processing write commands in a buffer memory for writing data to the nonvolatile memories in an ordinary write operation;
• processing read commands for a read modify write (RMW) operation;
• and
• processing the read commands for the RMW operation prior to all normal read commands, in processing a flush command for a write flush process;
• storing the write commands for the RMW operation in the buffer memory, after the read commands for the RMW operation have been processed;
• and
• performing the write flush process including processing of all write commands in the buffer memory, the all write commands including the write commands for the RMW operation.