Memory apparatus and operating method thereof

A memory apparatus, comprising:

• a plurality of memory modules, wherein each of the plurality of memory modules comprises a bank respectively and the bank comprises a plurality of memory units;
• a command input module used to receive a non-random access command and generate a corresponding switch control signal according to the non-random access command;
• a power supply module coupled to the command input module and the plurality of memory modules respectively;
• and
• a data access module coupled to the command input module and the plurality of memory modules respectively;
• wherein at a first time, the power supply module selectively provides power only to a first memory module of the plurality of memory modules according to the switch control signal and the data access module performs data access on the first memory module.