Memory system capable of generating notification signals

A memory system, comprising:

• a memory device configured to perform read operations or write operations;
• And
• a built-in self-test circuit configured to output a control signal required by the memory device to perform the read operations or the write operations, receive data outputted from the memory device, check whether the memory device functions normally, and generate a notification signal according to the data, wherein the notification signal is toggled whenever a read operation or a write operation is completed;
• and
• a switch device having a first input terminal configured to receive an external clock signal, a second input terminal configured to receive the notification signal, a select terminal configured to receive a selection signal, and an output terminal configured to output a memory clock signal to the memory device, wherein the memory clock signal is one of the external clock signal and the notification signal.

A method for operating a memory system, the memory system comprising a memory device and a built-in self-test circuit, the method comprising:

• triggering the memory device to perform a read operation or a write operation;
• once the memory device completes the read operation or the write operation:
• the built-in self-test circuit checking whether the memory device functions normally;
• and
• generating a notification signal;
• and
• triggering the memory device again to perform a following operation according to the notification signal;
• wherein the notification signal is a pulse used as a clock signal to trigger the memory device.