Data allocation and migration for Beidou navigation terminals with hybrid PCM main memory

Using phase change memory (PCM) as main memory for embedded systems, such as Beidou navigation terminals, has many advantages, such as non-volatile, energy saving, anti-crack and so on. However, the problem of write operations needs to be solved to prevent premature failure of the PCM chips. In this paper, the data allocation problem of a hybrid PCM and DRAM main memory in Beidou navigation terminals is studied. A data allocation and migration strategy between PCM and DRAM is proposed to effectively reduce the write operations on PCM, thus extending the lift endurance of the terminals without affecting the real-time performance.