Read-write dependency is an important factor restricting software efficiency.Timing Speculative(TS)is a processing architecture aiming to improve energy efficiency of microprocessors.Timing error rate,influenced by th...Read-write dependency is an important factor restricting software efficiency.Timing Speculative(TS)is a processing architecture aiming to improve energy efficiency of microprocessors.Timing error rate,influenced by the read-write dependency,bottlenecks the voltage down-scaling and so the energy efficiency of TS processors.We proposed a method called Read-Write Dependency Aware Register Allocation.It is based on the Read-Write Dependency aware Interference Graph(RWDIG)conception.Registers are reallocated to loosen the read-write dependencies,so resulting in a reduction of timing errors.The traditional no operation(Nop)padding method is also redesigned to increase the distance value to above 2.We analyzed the dependencies of registers and maximized the average distance value of read and write dependencies.Experimental results showed that we can reduce all read-write dependency by Nop padding,as well as the overhead timing errors.An energy saving of approximately 7%was achieved.展开更多
针对USB(universal serial bus)设备安全防护的热点问题,从访问控制层面探讨USB设备的安全防护措施,提出了属性基RBAC(role-based access control)的混合扩展安全访问控制模型.基于该模型,通过采取认证和控制相结合方法,设计并实现了US...针对USB(universal serial bus)设备安全防护的热点问题,从访问控制层面探讨USB设备的安全防护措施,提出了属性基RBAC(role-based access control)的混合扩展安全访问控制模型.基于该模型,通过采取认证和控制相结合方法,设计并实现了USB设备访问控制系统.实验验证了该模型及其访问控制系统的可行性,表明该系统可解决传统USB设备访问控制存在的粗粒度、静态分配等问题.展开更多
随着移动设备对高功率、高效率充电需求的不断增长,通用串行总线功率传输(Universal Serial Bus Power Delivery,USB PD)协议逐渐成为移动电源设计的核心标准。简要论述USB PD协议,研究磁吸充电技术、Buck-Boost工作模式及保护电路模块...随着移动设备对高功率、高效率充电需求的不断增长,通用串行总线功率传输(Universal Serial Bus Power Delivery,USB PD)协议逐渐成为移动电源设计的核心标准。简要论述USB PD协议,研究磁吸充电技术、Buck-Boost工作模式及保护电路模块的优化设计,提出磁吸移动电源优化方案,旨在为磁吸移动电源的标准化与高效设计提供技术参考。展开更多
通用串行接口(Universal Serial Bus,USB)总线在实际应用中较为广泛,涉及各行业的电子设备,目前大部分为USB3.0设备。USB3.0总线传输速率高,信号链路插损、回损较大,导致USB设备连接存在不稳定问题,基于此,本文开展USB3.0总线链路的研...通用串行接口(Universal Serial Bus,USB)总线在实际应用中较为广泛,涉及各行业的电子设备,目前大部分为USB3.0设备。USB3.0总线传输速率高,信号链路插损、回损较大,导致USB设备连接存在不稳定问题,基于此,本文开展USB3.0总线链路的研究。本文以实际工程项目为基础,通过建立USB3.0完整布线链路仿真模型,对影响线路链路不同影响因素进行仿真对比分析,综合仿真对比结果及实际布局布线情况,提出USB3.0布线链路的优化策略,最终仿真完整布线链路插损、回损结果能够满足USB3.0协议规范要求且留有一定余量,对实际产品USB3.0布线链路优化具有很强的指导意义。展开更多
基金This work was supported by the Project of Hunan Social Science Achievement Evaluation Committee(XSP20YBZ090,Sheng Xiao,2020).
文摘Read-write dependency is an important factor restricting software efficiency.Timing Speculative(TS)is a processing architecture aiming to improve energy efficiency of microprocessors.Timing error rate,influenced by the read-write dependency,bottlenecks the voltage down-scaling and so the energy efficiency of TS processors.We proposed a method called Read-Write Dependency Aware Register Allocation.It is based on the Read-Write Dependency aware Interference Graph(RWDIG)conception.Registers are reallocated to loosen the read-write dependencies,so resulting in a reduction of timing errors.The traditional no operation(Nop)padding method is also redesigned to increase the distance value to above 2.We analyzed the dependencies of registers and maximized the average distance value of read and write dependencies.Experimental results showed that we can reduce all read-write dependency by Nop padding,as well as the overhead timing errors.An energy saving of approximately 7%was achieved.
文摘针对USB(universal serial bus)设备安全防护的热点问题,从访问控制层面探讨USB设备的安全防护措施,提出了属性基RBAC(role-based access control)的混合扩展安全访问控制模型.基于该模型,通过采取认证和控制相结合方法,设计并实现了USB设备访问控制系统.实验验证了该模型及其访问控制系统的可行性,表明该系统可解决传统USB设备访问控制存在的粗粒度、静态分配等问题.
文摘随着移动设备对高功率、高效率充电需求的不断增长,通用串行总线功率传输(Universal Serial Bus Power Delivery,USB PD)协议逐渐成为移动电源设计的核心标准。简要论述USB PD协议,研究磁吸充电技术、Buck-Boost工作模式及保护电路模块的优化设计,提出磁吸移动电源优化方案,旨在为磁吸移动电源的标准化与高效设计提供技术参考。
文摘通用串行接口(Universal Serial Bus,USB)总线在实际应用中较为广泛,涉及各行业的电子设备,目前大部分为USB3.0设备。USB3.0总线传输速率高,信号链路插损、回损较大,导致USB设备连接存在不稳定问题,基于此,本文开展USB3.0总线链路的研究。本文以实际工程项目为基础,通过建立USB3.0完整布线链路仿真模型,对影响线路链路不同影响因素进行仿真对比分析,综合仿真对比结果及实际布局布线情况,提出USB3.0布线链路的优化策略,最终仿真完整布线链路插损、回损结果能够满足USB3.0协议规范要求且留有一定余量,对实际产品USB3.0布线链路优化具有很强的指导意义。
