A 1.8-V 64-kb four-way set-associative CMOS cache memory implemented by 0.18μm/1.8V 1P6M logic CMOS technology for a super performance 32-b RISC microprocessor is presented.For comparison,a conventional parallel acce...A 1.8-V 64-kb four-way set-associative CMOS cache memory implemented by 0.18μm/1.8V 1P6M logic CMOS technology for a super performance 32-b RISC microprocessor is presented.For comparison,a conventional parallel access cache with the same storage and organization is also designed and simulated using the same technology.Simulation results indicate that by using sequential access,power reduction of 26% on a cache hit and 35% on a cache miss is achieved.High-speed approaches including modified current-mode sense amplifier and split dynamic tag comparators are adopted to achieve fast data access.Simulation results indicate that a typical clock to data access of 2.7ns is achieved...展开更多
Recently,Content-Centric Networking(CCN) has been paid more and more attention.The modeling of CCN as an important research point is the foundation of the architecture.The past work of cache network modeling always as...Recently,Content-Centric Networking(CCN) has been paid more and more attention.The modeling of CCN as an important research point is the foundation of the architecture.The past work of cache network modeling always assumes the virtual round trip time(VRTT) is zero for simplicity.However,this assumption isn't practical and results in model error especially in CCN.CCN's router can aggregate the content requests during the VRTT to avoid content delivery repeatedly.Thus,to modeling CCN data transfer,as well as understanding how it should be managed,the VRTT shouldn't be ignored.In this paper,we model the data transfer in CCN,and propose a multi-cache with aggregation approximation(MCAA)algorithm to get the content miss rate and VRTT at each router.Simulation results show the validity of our MCAA algorithm.展开更多
A Single-Buffered （SB） router is a router where only one stage of shared buffering is sandwiched between two interconnects in comparison of a Combined Input and Output Queued （CIOQ） router where a central switch f...A Single-Buffered （SB） router is a router where only one stage of shared buffering is sandwiched between two interconnects in comparison of a Combined Input and Output Queued （CIOQ） router where a central switch fabric is sandwiched between two stages of buffering. The notion of SB routers was firstly proposed by the High-Performance Networking Group （HPNG） of Stanford University, along with two promising designs of SB routers： one of which was Parallel Shared Memory （PSM） router and the other was Distributed Shared Memory （DSM） router. Admittedly, the work of HPNG deserved full credit, but all results presented by them appeared to relay on a Centralized Memory Management Algorithm （CMMA） which was essentially impractical because of the high processing and communication complexity. This paper attempts to make a scalable high-speed SB router completely practical by introducing a fully distributed architecture for managing the shared memory of SB routers. The resulting SB router is called as a Virtual Output and Input Queued （VOIQ） router. Furthermore, the scheme of VOIQ routers can not only eliminate the need for the CMMA scheduler, thus allowing a fully distributed implementation with low processing and commu- nication complexity, but also provide QoS guarantees and efficiently support variable-length packets in this paper. In particular, the results of performance testing and the hardware implementation of our VOIQ-based router （NDSC~ SR1880-TTM series） are illustrated at the end of this paper. The proposal of this paper is the first distributed scheme of how to design and implement SB routers publicized till now.展开更多
The Vision Earth System is a interactive system by employing B/S model.The system has the function of query display and mutually displays relevant geologic information,integrating image information of one outcrop and ...The Vision Earth System is a interactive system by employing B/S model.The system has the function of query display and mutually displays relevant geologic information,integrating image information of one outcrop and realizing 3D geologic visualization.In this system,the basis is effective store,transmitting,display and quick query of enormous images and their properties data.From Java technology,this essay researches the elementary realization of Vision Earth System by adopting store formality of enormous images database,quick display image of website and quick image storage method.展开更多
This paper explains intra prediction method for High Efficiency Video Coding(HEVC).Intra prediction removes correlation of adjacent samples in spatial domain.Intra predictor requires reference images which are stored ...This paper explains intra prediction method for High Efficiency Video Coding(HEVC).Intra prediction removes correlation of adjacent samples in spatial domain.Intra predictor requires reference images which are stored in external memory.Memory access is required frequently in process of intra prediction.The proposed architecture can reduce external memory access by optimized internal buffer.展开更多
文摘A 1.8-V 64-kb four-way set-associative CMOS cache memory implemented by 0.18μm/1.8V 1P6M logic CMOS technology for a super performance 32-b RISC microprocessor is presented.For comparison,a conventional parallel access cache with the same storage and organization is also designed and simulated using the same technology.Simulation results indicate that by using sequential access,power reduction of 26% on a cache hit and 35% on a cache miss is achieved.High-speed approaches including modified current-mode sense amplifier and split dynamic tag comparators are adopted to achieve fast data access.Simulation results indicate that a typical clock to data access of 2.7ns is achieved...
基金supported by the National Basic Research Program(973) of China(No. 2012CB315801)the National Natural Science Fund(No.61302089)the fundamental research funds for the Central Universities(No. 2013RC0113)
文摘Recently,Content-Centric Networking(CCN) has been paid more and more attention.The modeling of CCN as an important research point is the foundation of the architecture.The past work of cache network modeling always assumes the virtual round trip time(VRTT) is zero for simplicity.However,this assumption isn't practical and results in model error especially in CCN.CCN's router can aggregate the content requests during the VRTT to avoid content delivery repeatedly.Thus,to modeling CCN data transfer,as well as understanding how it should be managed,the VRTT shouldn't be ignored.In this paper,we model the data transfer in CCN,and propose a multi-cache with aggregation approximation(MCAA)algorithm to get the content miss rate and VRTT at each router.Simulation results show the validity of our MCAA algorithm.
基金the National High-Tech Research and De-velopment Program of China (863 Program) (2003AA103510, 2004AA103130, 2005AA121210).
文摘A Single-Buffered （SB） router is a router where only one stage of shared buffering is sandwiched between two interconnects in comparison of a Combined Input and Output Queued （CIOQ） router where a central switch fabric is sandwiched between two stages of buffering. The notion of SB routers was firstly proposed by the High-Performance Networking Group （HPNG） of Stanford University, along with two promising designs of SB routers： one of which was Parallel Shared Memory （PSM） router and the other was Distributed Shared Memory （DSM） router. Admittedly, the work of HPNG deserved full credit, but all results presented by them appeared to relay on a Centralized Memory Management Algorithm （CMMA） which was essentially impractical because of the high processing and communication complexity. This paper attempts to make a scalable high-speed SB router completely practical by introducing a fully distributed architecture for managing the shared memory of SB routers. The resulting SB router is called as a Virtual Output and Input Queued （VOIQ） router. Furthermore, the scheme of VOIQ routers can not only eliminate the need for the CMMA scheduler, thus allowing a fully distributed implementation with low processing and commu- nication complexity, but also provide QoS guarantees and efficiently support variable-length packets in this paper. In particular, the results of performance testing and the hardware implementation of our VOIQ-based router （NDSC~ SR1880-TTM series） are illustrated at the end of this paper. The proposal of this paper is the first distributed scheme of how to design and implement SB routers publicized till now.
基金Supported by National Oil-gas Project : No XQ-2004-07
文摘The Vision Earth System is a interactive system by employing B/S model.The system has the function of query display and mutually displays relevant geologic information,integrating image information of one outcrop and realizing 3D geologic visualization.In this system,the basis is effective store,transmitting,display and quick query of enormous images and their properties data.From Java technology,this essay researches the elementary realization of Vision Earth System by adopting store formality of enormous images database,quick display image of website and quick image storage method.
基金supported by the MKE(The Ministry of Knowledge Economy),Korea,under the ITRC(Infor mation Technology Research Center)support program supervised by the NIPA(National IT Industry Promotion Agency)(NIPA-2011-C1090-1021-0010)
文摘This paper explains intra prediction method for High Efficiency Video Coding(HEVC).Intra prediction removes correlation of adjacent samples in spatial domain.Intra predictor requires reference images which are stored in external memory.Memory access is required frequently in process of intra prediction.The proposed architecture can reduce external memory access by optimized internal buffer.
