Memory system

A method of accessing identification information in a memory system comprising a controller connected to a host device via a first bus conforming to a serial peripheral interface (SPI) standard and a non-volatile memory device connected to the controller via a second bus, the method comprising:

• receiving, by the controller, a command signal over the first bus immediately after receiving a chip select signal from the host device over the first bus;
• recognizing, by the controller, that the command signal is an identification (ID) read command;
• and
• upon recognizing that the command signal is the ID read command,
• outputting, by the controller, to the host device over the first bus, response information that is generated from the first information, the second information, the third information, and the fourth information that are read from the non-volatile memory, and has the data size indicated by the first information, wherein the response information having the data size indicated by the first information does not include the first information and includes one of:
• (i) the second information and the third information, and (ii) the second information, the third information, and the fourth information.

A memory system comprising:

• a controller having a host interface circuit configured to communicate with a host device according to a serial peripheral interface (SPI) standard, a storage area in which identification (ID) information is to be stored, and a memory interface circuit;
• and
• a non-volatile memory device that is connected to the memory interface circuit and stores first information indicating a data size, second information indicating a manufacturer ID, third information indicating a device ID, and fourth information, wherein
• during start-up of the memory system, the controller issues a command to read the first information, the second information, the third information, and the fourth information from the non-volatile memory device, and stores the first information, the second information, the third information, and the fourth information read from the non-volatile memory device in the storage area, and
• upon recognizing a command signal received from the host device as an identification (ID) read command, the controller outputs, to the host device, response information that is generated from the first information, the second information, the third information, and the fourth information, and has the data size indicated by the first information, wherein the response information having the data size indicated by the first information does not include the first information and includes any one of:
• (i) the second information and the third information, and (ii) the second information, the third information, and the fourth information.