Memory management method for continuously recording digital content and circuit system thereof

A circuit system, comprising:

• a control circuit;
• a memory electrically connected with the control circuit and setting a buffer that is defined as a main buffer or a pre-buffer according to a current situation;
• a storage device electrically connected with the control circuit;
• wherein the control circuit operates a memory management method for continuously recording digital content, comprising:
• defining, under a continuous recording mode, the buffer of the circuit system as the pre-buffer, and the circuit system sequentially buffering a continuously-received data to the pre-buffer in a first-in-first-out manner, wherein a size of the buffer is determined according to a target bit rate for generating the continuously-received data and an access time of the pre-buffer;
• and
• when a start-record instruction is received, entering, by the circuit system, an event-recording mode and defining, by the circuit system, the buffer as the main buffer, so that a pre-buffer data buffered in the pre-buffer for the access time of the pre-buffer and the continuously-received data that is continuously buffered in the main buffer are combined to yield combined data, and the combined data is written to the storage device until a stop-record instruction is received.