Memory card and non-volatile memory controller thereof

A memory card, comprising:

• a non-volatile memory;
• and
• a non-volatile memory controller, comprising:
• a firmware download port group, for coupled to a firmware update fixture;
• a memory interface unit, comprising at least one tri-state buffer component, wherein the memory interface unit is coupled to the non-volatile memory and the firmware download port group through the tri-state buffer component, and the tri-state buffer component determines whether to operate in a high-impedance mode or a normal mode according to a mode signal;
• a processing unit, coupled to the memory interface unit, wherein the processing unit accesses the non-volatile memory through the memory interface unit;
• and
• a host interface unit, coupled to the processing unit, wherein the processing unit provides a processing interface through the host interface unit to allow a host to access the non-volatile memory;
• wherein when the tri-state buffer component operates in the high-impedance mode according to the mode signal, the firmware update fixture writes a new firmware into the non-volatile memory through the firmware download port group.