Data storage system and management method thereof

A data storage system, comprising:

• a data storage device;
• and
• a host device, coupled to the data storage device through a bus;
• wherein the data storage device comprises:
• a data storage controller, configured to determine the data storage device needs to use a first temporary memory of the host device to store data in a second temporary memory of the data storage device;
• and
• a data storage transceiver, coupled to the data storage controller, based on the determination, configured to issue a Device Bus Master (DBM) request message via the bus to the host device to request for a control right to control data transfer on the bus;
• the host device comprises:
• a host device controller, after detecting the DBM request message, configured to issue a first DBM acknowledgement message via the bus;
• and
• wherein the data storage controller is configured to detect the bus to determine whether to receive the first DBM acknowledgement message from the host device, and if the first DBM acknowledgement message is received, transmit a DBM response message to the host device, and then access the first temporary memory of the host device,
• wherein the DBM response message comprises relevant information for accessing the first temporary memory of the host device, and wherein the relevant information includes a data address and a data length of the first temporary memory of the host device,
• wherein the first DBM acknowledgement message and DBM response message are transmitted through the same command signal line of the bus as normal instruction command and response command.