Data accessing method using dynamic speed adjustment with aid of thermal control unit, and associated apparatus

A memory controller of a memory device, the memory device comprising the memory controller and a non-volatile (NV) memory, the NV memory comprising at least one NV memory element, the memory controller comprising:

• a processing circuit, arranged to control the memory controller according to a plurality of host commands from a host device, to allow the host device to access the NV memory through the memory controller;
• a transmission interface circuit, coupled to the processing circuit, arranged to perform communications with the host device;
• and
• a memory device protection circuit, coupled to the processing circuit, arranged to perform memory device protection on the memory device, wherein the memory device protection circuit comprises:
• a thermal control unit, arranged to perform thermal control, for triggering dynamic speed adjustment during data accessing;
• wherein:
• the memory controller utilizes the thermal control unit to start monitoring temperature at a predetermined intra-controller location of the memory controller;
• in response to at least one accessing request from the host device, the memory controller controls the transmission interface circuit to perform data transmission between the host device and the memory controller at an original communications speed, for accessing data in the NV memory;
• in response to the temperature being greater than a first temperature threshold, the memory controller detects an increment of the temperature between a first start time point and a first end time point, wherein a first time period from the first start time point to the first end time point corresponds to a first predetermined time difference;
• based on at least one first predetermined rule, the memory controller determines a first communications speed according to the increment;
• the memory controller controls the transmission interface circuit to switch from the original communications speed to the first communications speed, for performing data transmission between the host device and the memory controller at the first communications speed;
• in response to the temperature being less than a second temperature threshold, the memory controller detects a decrement of the temperature between a second start time point and a second end time point, wherein a second time period from the second start time point to the second end time point corresponds to a second predetermined time difference;
• based on at least one second predetermined rule, the memory controller determines a second communications speed according to the decrement;
• and
• the memory controller controls the transmission interface circuit to switch from the first communications speed to the second communications speed, for performing data transmission between the host device and the memory controller at the second communications speed.