Data storage device

A data storage device connected to an in-vehicle network, the device comprising:

• a data accumulation unit including a NAND interface;
• a bus interface mounted on the same substrate as the data accumulation unit and connected to a bus of the in-vehicle network;
• a processor mounted on the same substrate as the data accumulation unit and the bus interface, and configured to control operation of the data storage device so as to spontaneously acquire data from the in-vehicle network via the bus interface and store the data in the data accumulation unit;
• and
• a storage interface mounted on the same substrate as the data accumulation unit, the bus interface, and the processor, capable of performing communication faster than the bus interface, and capable of accessing the data accumulation unit using a logical block address, wherein
• the processor comprises:
• a message processing unit configured to transmit and receive messages, via the bus interface, to and from an electronic control unit or an external device connected to the in-vehicle network;
• a data access processing unit configured to command the data accumulation unit to write and read data;
• and
• an LBA association unit configured to associate a logical block address with a physical address;
• and
• data included in a message received by the message processing unit is written in the data accumulation unit in accordance with a command of the data access processing unit, and
• when a read command designating a logical block address is received from an external device via the storage interface, the data access processing unit designates a physical address associated with a designated logical block address, and commands the data accumulation unit to read data.

A data storage device connected to an in-vehicle network, the device comprising:

• a data accumulation unit including a NAND interface;
• a bus interface mounted on the same substrate as the data accumulation unit and connected to a bus of the in-vehicle network;
• and
• a processor mounted on the same substrate as the data accumulation unit and the bus interface, and configured to control operation of the data storage device so as to spontaneously acquire data from the in-vehicle network via the bus interface and store the data in the data accumulation unit, wherein
• the processor comprises:
• a message processing unit configured to transmit and receive messages, via the bus interface, to and from an electronic control unit or an external device connected to the in-vehicle network;
• a data access processing unit configured to command the data accumulation unit to write and read data;
• a second data monitoring unit configured to analyze data acquired from the in-vehicle network and inspect occurrence of abnormality;
• and
• a rule management unit configured to store an association relationship between an abnormal state having occurred and a rule to acquire data necessary to identify a cause of the abnormal state, and configured to set, when the second data monitoring unit detects the abnormal state, the rule associated with the detected abnormal state;
• and
• data included in a message received by the message processing unit is written in the data accumulation unit in accordance with a command of the data access processing unit, and
• data is acquired from the in-vehicle network in accordance with the set rule.