Volatile memory device and self-refresh method by enabling a voltage boost signal

A volatile memory device, comprising:

• a dynamic memory array;
• a controller, coupled to the dynamic memory array, transmitting a self-refresh request signal when entering a power saving mode, wherein the controller comprises:
• a control logic circuit, receiving a basic clock signal and a clock enabling signal;
• an address decoder, coupled to the control logic circuit and the dynamic memory array to generate an address signal;
• and
• a plurality of status registers, directly coupled to the address decoder and the control logic circuit to store a status information of the volatile memory device;
• a refresh signal generator, coupled to the controller, periodically enabling a voltage boost signal according to the self-refresh request signal;
• a pull-up circuit, coupled to the refresh signal generator and the dynamic memory array, when the enabled voltage boost signal is detected, pulling up an operating voltage for driving a word line in the dynamic memory array to a self-refresh level;
• and
• an input/output circuit, coupled to the dynamic memory array and the controller,
• wherein, when the operating voltage is pulled up to the self-refresh level, the controller performs the self-refresh operation on the dynamic memory array,
• when the self-refresh operation is completed, the pull-up circuit floats the operating voltage,
• wherein when the self-refresh operation is completed, the refresh signal generator disables the voltage boost signal,
• wherein after pulling the operating voltage up to the self-refresh level, the pull-up circuit enables a voltage ready signal to notify that the operating voltage has reached the self-refresh level,
• wherein after the self-refresh operation is completed, the pull-up circuit disables the voltage ready signal to wait for next self-refresh operation.