Data storage device with an exclusive channel for flag checking of read data, and non-volatile memory control method

A data storage device, comprising:

• a non-volatile memory;
• and
• a controller, having a host bridge controller, a master computing unit, an interconnect bus, a system memory, and a non-volatile memory interface controller,
• wherein:
• the host bridge controller is coupled to a host, the non-volatile memory interface controller is coupled to the non-volatile memory, the host bridge controller and the master computing unit are coupled to the system memory through the interconnect bus, and the non-volatile memory interface controller is coupled between the system memory and the non-volatile memory;
• in response to a read command issued by the host, the non-volatile memory interface controller reads data from the non-volatile memory, temporarily stores the data in the system memory, and then asserts a flag corresponding to the data temporarily stored in the system memory;
• checking the flag through a first channel provided by the interconnect bus, the host bridge controller reads the data temporarily stored in the system memory according to the asserted flag;
• and
• the master computing unit reads the system memory through a second channel provided by the interconnect bus.