本文结合实际研发要求,对基于USB2.0的数字音频编解码片上系统的可测试性设计(DFT)策略进行了研究。该系统采用UMC 0.13μm CMOS工艺,集成SPRAM、DPRAM、ROM、上电复位单元POR(Power On Reset)、降压转换器LDO(Low Drop Out regulator)...本文结合实际研发要求,对基于USB2.0的数字音频编解码片上系统的可测试性设计(DFT)策略进行了研究。该系统采用UMC 0.13μm CMOS工艺,集成SPRAM、DPRAM、ROM、上电复位单元POR(Power On Reset)、降压转换器LDO(Low Drop Out regulator)、锁相环PLL(Phase Locked Loop)、电熔丝盒(e-fuse box)、ADC、USB焊盘等模块。本文采用JTAG(Joint Test Action Group)和焊盘控制逻辑PCL(Pad Control Logic)进行测试控制,使得所有模块可测试。扫描链测试采用多种优化策略,故障覆盖率达到98.06%,满足系统设计要求。存储器内建自测试(MBIST),采用并行测试和串行调试策略,将所有存储器测试时间压缩为单块最大容量存储器的测试时间。电熔丝测试控制采用状态机和编程加速逻辑,简化了测试接口,并消除了冗余的编程时间(0%～100%)。本文的各种可测试性设计策略在实际产品中已经得到验证,可广泛应用于复杂的片上系统(SoC)的设计,研究结论具有一定的应用参考价值。展开更多
First-principles method is used to simulate the stable structure and optical properties of a 96-atom fused silica.The preferable structure of NBOHC-E＇（non-bridging oxygen hole center（NBOHC） and E＇ center） pair d...First-principles method is used to simulate the stable structure and optical properties of a 96-atom fused silica.The preferable structure of NBOHC-E＇（non-bridging oxygen hole center（NBOHC） and E＇ center） pair defect is predicted to be located at 2.4 A^° for the Si-O bond length.The quasi-particle GOWO calculations are performed and an accurate band gap is obtained in order to calculate the optical absorption properties.With the stretching of the Sil-O1 bond,an obvious redshift can be observed in the absorption spectrum.In the case of NBOHC-E＇ pair,the p-orbital DOS of Si1 atom will shift to the conduction band.Two obvious absorption peaks can be observed in the absorption spectrum.The calculation reproduced the peak positions of the well-known optical absorption bands.展开更多
The nonlinear J-E characteristics under self-heating equilibrium for conductive composites based on high density polyethylene were studied. The results show that there are identical conduction mechanisms under self-he...The nonlinear J-E characteristics under self-heating equilibrium for conductive composites based on high density polyethylene were studied. The results show that there are identical conduction mechanisms under self-heating equilibrium for the composites with various initial resistivities determined by filler content or ambient temperature. The nonlinear conduction behavior was involved in the limited microstructure transformations of the conducting network induced by electrical field applied and the corresponding self-heating effect. A reversible thermal fuse (RTF) model was suggested to interpret the physical origin of the nonlinear J-E characteristics.展开更多
文摘本文结合实际研发要求,对基于USB2.0的数字音频编解码片上系统的可测试性设计(DFT)策略进行了研究。该系统采用UMC 0.13μm CMOS工艺,集成SPRAM、DPRAM、ROM、上电复位单元POR(Power On Reset)、降压转换器LDO(Low Drop Out regulator)、锁相环PLL(Phase Locked Loop)、电熔丝盒(e-fuse box)、ADC、USB焊盘等模块。本文采用JTAG(Joint Test Action Group)和焊盘控制逻辑PCL(Pad Control Logic)进行测试控制,使得所有模块可测试。扫描链测试采用多种优化策略,故障覆盖率达到98.06%,满足系统设计要求。存储器内建自测试(MBIST),采用并行测试和串行调试策略,将所有存储器测试时间压缩为单块最大容量存储器的测试时间。电熔丝测试控制采用状态机和编程加速逻辑,简化了测试接口,并消除了冗余的编程时间(0%～100%)。本文的各种可测试性设计策略在实际产品中已经得到验证,可广泛应用于复杂的片上系统(SoC)的设计,研究结论具有一定的应用参考价值。
基金supported by the National Basic Research Program of China(Grant No.2014CB643900)the Open Fund of IPOC(BUPT)+2 种基金the Open Program of State Key Laboratory of Functional Materials for Informaticsthe National Natural Science Foundation for Theoretical Physics Special Fund “Cooperation Program”(Grant No.11547039)Shaanxi Provincial Institute of Scientific Research Plan Projects,China(Grant No.SLGKYQD2-05)
文摘First-principles method is used to simulate the stable structure and optical properties of a 96-atom fused silica.The preferable structure of NBOHC-E＇（non-bridging oxygen hole center（NBOHC） and E＇ center） pair defect is predicted to be located at 2.4 A^° for the Si-O bond length.The quasi-particle GOWO calculations are performed and an accurate band gap is obtained in order to calculate the optical absorption properties.With the stretching of the Sil-O1 bond,an obvious redshift can be observed in the absorption spectrum.In the case of NBOHC-E＇ pair,the p-orbital DOS of Si1 atom will shift to the conduction band.Two obvious absorption peaks can be observed in the absorption spectrum.The calculation reproduced the peak positions of the well-known optical absorption bands.
基金the National Advanced Material Committee of China (NAMCC)，国家自然科学基金
文摘The nonlinear J-E characteristics under self-heating equilibrium for conductive composites based on high density polyethylene were studied. The results show that there are identical conduction mechanisms under self-heating equilibrium for the composites with various initial resistivities determined by filler content or ambient temperature. The nonlinear conduction behavior was involved in the limited microstructure transformations of the conducting network induced by electrical field applied and the corresponding self-heating effect. A reversible thermal fuse (RTF) model was suggested to interpret the physical origin of the nonlinear J-E characteristics.
