Method and system to synchronize a multi-level memory

摘要

A method and system is provided for synchronizing multi-level memory. The system has an internal memory and an external memory. Data packets are initially stored in the internal memory. A determination is made as to whether to transfer the data packet to the external memory based on congestion of system resources. When it is time to transfer a data packet that should be stored in external memory to an output port, a determination is made as to whether the data packet has actually been transferred to the external memory. If the data packet has been transferred to the external memory, the data packet is retrieved from the external memory and transferred to the output port. Otherwise, no attempt is made to transfer the data packet from external memory to the output port until the data packet has been transferred to the external memory. This ensures that no attempt is made to retrieve the data packet from the external memory when the data packet is still being stored in the internal memory.