关键词: 混合存储器, PRAM存储器, SRAM写缓存, 低功耗, 写操作次数, 替换算法

Abstract: Because of DRAM’s ultra-high static power consumption, large capacity main memory in high performance computer system has too large energy consumption, which inspires the study of new structures of large capacity main memory. Focusing on above problems, this paper designs a hybrid main memory composed of SRAM and PRAM, and SRAM is the write buffer of PRAM. Moreover, an improved LRFU algorithm is applied to an SRAM write buffer. On the premise that the effect on the performance is not big, the energy consumption of main memory is reduced and the usable time of PRAM is extended effectively. The experimental results indicate that Energy-Delay-Product（EDP） of hybrid memory designed in the paper is 40% of pure DRAM memory. Compared with the pure PRAM structure or the structure using SRAM as Cache, PRAM write operation times are reduced 28.5% and 13%, respectively.

Key words: hybrid memory, PhaseChange Radom Access Memory（PRAM）, SRAM write buffer, low energy consumption, times of write operation, replacement algorithm