基于FPGA的通用异步收发传输器控制FLASH存储系统设计

为了解决测井数据文件的存储问题,提出了一种基于FPGA实现通用异步收发传输器(UART)控制FLASH存储系统设计的方法。以FPGA作为核心控制器对系统结构进行了模块化分解,以适应自顶向下的设计方法。在Quartus II开发平台中采用Verilog硬件描述语言利用有限状态机,实现了UART控制FLASH的读、写、擦除操作;并给出了UART控制FLASH的数学模型。采用Spansion公司的S29AL016D系列FLASH结合FPGA和UART设计了接口电路。最后在Modelsim环境下进行仿真,验证了该存储系统设计的正确性和可靠性。     

基于NAND型FLASH的双备份固态存储系统

设计了一种以NAND型FLASH为存储核心的高速、大容量数据双备份存储系统,实现了对高速遥测数据的采集及实时可靠存储。采用模块化的设计思想,以现场可编程门阵列(FPGA)作为主控芯片,将采集的遥测数据进行高频消抖后,送入双FLASH并行存储;同时实现对FLASH的自断电保护。针对高速、高压、高冲击等各种高过载环境,对存储模块采用双筒灌封防护技术,有效保护了实验结果。从硬件电路及逻辑时序两个方面介绍了此存储系统,并给出了试验结果。     

利用UART 对FPGA 进行升级的方法

为节省FPGA( Field Programmable Gate Array) 升级工作的时间和成本,设计了一种利用UART( Universal Asynchronous Receiver /Transmitter) 替代传统JTAG( Joint Test Action Group) 方式升级的FPGA 程序方法,该设计 主要由Xilinx FPGA、UART 芯片、Flash 芯片和串口连接线等组成。通过将MicroBlaze 处理器、ICAP( Internal Configuration Access Port) 、IP( Intellectual Property) 核及UART 控制模块等集成在FPGA 芯片中实现可编程片上 系统的搭建。同时采用MultiBoot 双镜像技术,实现了即使在更新失败的情况下,依旧可加载备份镜像保证系 统正常工作,以此保证设计的稳定性。实验结果表明,此设计可以替代传统FPGA 升级方法,节省升级工作的 时间和成本。本设计具有更新效率高、维护成本低、稳定性高等优点,且可用于FPGA 远程更新。     

基于FPGA的数据记录仪NAND FLASH读写模块研制

随着船舶、航空电子技术的发展,大容量参数记录系统成为设备中必备的部分。文章介绍一种在参数记录仪中应用的基于FPGA的NAND FLASH读写模块,采用固态存储芯片NAND FLASH作为存储介质,FPGA作为存储器的控制核心,使用FPGA内部存储器构建FIFO输入和输出缓冲区,引入坏块自动屏蔽技术,在系统中FIFO作为NAND FLASH的读写端口,简化了外部CPU进行数据存储。实验结果表明,该模块能快速的嵌入到记录仪系统中。     

FPGA实现指纹读取接口UART

在基于FPGA设计的指纹识别模块中,通过在FPGA内部实现的UART接口与指纹传感器AFS8600连接,完成了FPGA对指纹图像的读取。本文用状态机讨论了UART的基本功能。并给出了FPGA与指纹传感器的连接方法以及UART在Quartus II5.0环境中的仿真图像。     

旋转弹用微惯性测量组合数模混合信号采编系统设计

针对某型号旋转弹用微惯性测量组合实际应用需求,设计并实现了一种基于FPGA的大容量微惯性测量组合(MIMU)数据采编系统。以ADS8365采样转换模拟量,以MAX3490实现RS422接口信号电平转换。将MIMU输出的数据存储到FLASH存储器中,实现对弹体整个飞行过程中信息的准确采集。探讨了系统硬件电路搭建、时序逻辑控制设计方法,重点叙述了FPGA控制数据采编与存储时序逻辑设计。实验证明该系统很好地实现了对MIMU输出的数模混合数据的采集,具有小型化、低功耗、抗高过载等优点,非常适用于惯性导航中需多通道混合数据采集的应用场所。     

基于DSP和FPGA的UART系统设计

基于DSP和FPGA的异步串口UART的工作原理和软、硬件设计.采用DSP作为处理器,将UART的核心功能嵌入到PFGA内部,并利用DSP的EDMA功能完成FPGA内部FIFO和DSP内部RAM中乒乓缓冲器之间的数据传输.使用VHDL硬件描述语言对PFGA进行编程,并在Quartus Ⅱ 7.2中完成了时序仿真,最后在Altera的CYCLONE系列FPGA上下载实现,验证了用FPGA实现串口通信的可行性.     

基于FPGA的多通道并行UART接口设计

针对现有多串口测控系统数据传输率低,各通信接口之间相互影响且不能并行通信的问题,提出了一种基于FPGA的多通道并行UART接口设计方法。依据RS-232异步通信协议,首先采用硬件描述语言设计了UART接口的波特率发生器、发送模块和接收模块,然后在EP2C8器件上对设计的多通道并行UART逻辑功能进行测试。试验结果表明,该设计方法能够实现10 Hz GPS数据帧和76.29 Hz航向参考系统AHRS数据帧的完整接收,各UART模块之间能并行工作,数据帧传输完整可靠。     

基于FPGA芯片的音乐存储与回放系统实现

采用现场可编程门阵列FPGA芯片和VHDL硬件描述语言,以及层次化的自顶向下工程设计方法,实现了一个由数控分频器和四位拨码开关控制的可进行乐谱存储及演奏存储与回放的系统,研究表明,采用FPGA实现音乐存储与回放演奏系统是可行的,为各类多媒体大容量语音芯片系统设计开辟了一条新的技术方法.     

基于FPGA的SPI接口Flash控制器设计及其在存储配置数据中的应用

针对现场可编程门阵列(FPGA)丰富的逻辑资源及产生精确时序的能力,给出一种基于FPGA的SPI控制器的设计方法.可方便地对SPI flash进行读写、擦除等操作,从而能快速、准确地存储数据.在SPI控制器设计过程中使用Modelsim进行仿真验证,并用VHDL硬件描述语言进行编程,下载到FPGA开发板上进行测试,对SPI接口flash进行操作,证明了系统设计方法的正确性和可靠性,该方法对flash存储控制系统的设计具有普遍适用性,实现了对以FPGA为控制核心的系统数据长时间存储.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that