学术活动

学术活动

Mercury: A Fast and Energy Efficient Phase Change Memory System

 
    人:李涛教授,美国佛罗里达大学电子与计算机工程系
      间:2015422日(周三),下午15:10
      点:首师大北二区二层大会议室
位:必赢76net线路官网信息工程学院
主讲人介绍:
    李涛教授,2004年德州奥斯汀分校获得计算机工程博士学位,目前为美国佛罗里达大学电子与计算机工程系终身正教授。李涛博士于2011年获中国国家自然科学基金会海外杰青奖,2009年获美国国家科学基金会杰出青年教授奖,2008年,2007年,2006年均获IBM学院奖,2008年获得微软研究院安全及可扩展多核计算机奖,2006年还获得微软研究院可信计算课程研究奖,两次获得博士论文导师奖。研究方向包括计算机系统结构,高效可靠微处理器及存储系统,新型技术及应用对硬件和操作系统/系统软件和编译的影响,以及计算的性能、功耗、可靠性及安全性问题等。目前研究项目包括多核系统的系统资源智能化管理、纳米级系统结构设计中的可靠性优化、GPGPU体系结构、高性能低功耗服务器的数据中心体系结构设计、新型技术驱动的架构设计等。在ISCA, MICRO, HPCA, ASPLOS, SIGMETRICS, PACT, DSN等计算机体系结构类顶级国际会议和IEEE/ACM Transactions 杂志上发表学术论文多篇,其中多篇获得最佳论文或最佳论文提名。
绍:
    Phase Change Memory (PCM) is one of the most promising technologies among emerging non-volatile memories. PCM stores data in crystalline and amorphous phases of the GST material using large differences in their electrical resistivity. The effect of process variation (PV) on PCM cell exacerbates the variability in necessary programming current and hence the target resistance spread, leading to the demand for high-latency, multi-iteration-based programming-and-verify write schemes for MLC-PCM. PV-aware control of programming current, programming using staircase down current pulses and programming using increasing reset current pulses are some of the traditional techniques used to achieve optimum programming energy, write latency and accuracy, but they usually target on optimizing only one aspect of the design . In this talk, I will address the high-write latency and process variation issues of MLC-PCM by introducing Mercury: A fast and energy efficient multi-level cell based phase change memory architecture. Mercury adapts the programming scheme of a multi-level PCM cell by taking into consideration the initial state of the cell, the target resistance to be programmed and the effect of process variation on the programming current profile of the cell. The proposed techniques act at circuit as well as micro- architecture levels. Simulation results show that Mercury achieves 10% saving in programming latency and 25% saving in programming energy for the PCM memory system compared to that of the traditional methods.
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