Method for performing power management in a memory device, associated memory device and controller thereof, and associated electronic device

A memory device, comprising:

• a non-volatile (NV) memory, arranged to store information, wherein the NV memory comprises at least one NV memory element;
• and
• a controller, coupled to the NV memory, arranged to control operations of the memory device, wherein the controller comprises:
• a processing circuit, arranged to control the controller according to a plurality of host commands from a host device, to allow the host device to access the NV memory through the controller;
• and
• a transmission interface circuit, coupled to the processing circuit, arranged to perform communications with the host device for the memory device;
• wherein:
• during an initialization phase of the memory device, the controller detects whether the host device supports communications corresponding to a first communications protocol;
• and
• before detecting that the host device supports communications corresponding to the first communications protocol, the controller controls a physical layer (PHY) circuit within the transmission interface circuit to keep staying at a power off state to save power, wherein the PHY circuit supports communications corresponding to the first communications protocol.

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

• a processing circuit, arranged to control the controller according to a plurality of host commands from a host device, to allow the host device to access the NV memory through the controller;
• and
• a transmission interface circuit, coupled to the processing circuit, arranged to perform communications with the host device for the memory device;
• wherein:
• during an initialization phase of the memory device, the controller detects whether the host device supports communications corresponding to a first communications protocol;
• and
• before detecting that the host device supports communications corresponding to the first communications protocol, the controller controls a physical layer (PHY) circuit within the transmission interface circuit to keep staying at a power off state to save power, wherein the PHY circuit supports communications corresponding to the first communications protocol.