采用USB-UART转换方式实现DSP与PC机的USB通信

介绍了异步串行通信芯片SC16C550和USB-UART转换芯片FT232BM的功能、结构特点和内部寄存器．在此基础上设计了通信系统的硬件电路，针对一类应用于运动控制的DSP系统的数据传输需求较低且数据流零散的特点．提出了一种采用LISB-UART转换方式实现该类DSP系统与PC机USB通信的方案．这种方案不但满足了LISB通信方便快捷的特点．而且继承了传统UART通信占用系统资源少、通信固件开发简单的优势．设计了通信系统程序流程图，选用ADSP-21992为目标DSP，介绍了其代码开发平台VisualDSP 3．5及其相关调试工具，并根据流程图简述了DSP内的程序代码组织结构和运行机制．最后说明了PC机上相关驱程的开发步骤和重要函数。     

带安全访问模块的USB接口的智能读卡器的设计

针对目前流行的智能卡技术，提出了一种基于USB接口的智能读卡器，利用PDIUSBD12与PC机之间的通信协议，引入了安全认证访问模块，从而提高了安全性，实现了使用USB接口和主机相连的智能读卡器。     

三维复空间中一个卷积算子的模估计

引进单位圆盘E={z:|z |＜1 }内的卷积算子Dα p-1,构建三维复空间中满足某些条件的复值函数类ψ(α),并得到一个模估计.     

USB在A/D转换上的应用

介绍了通用串行总线（USB）技术的特点和USB设备的开发过程，以及如何用USB接口芯片PDIUSBD12来开发数据采集系统的主要设计思想，并通过USB在A／D转换方面的一个应用实例来说明其设计过程。     

基于USB的ARINC 429总线数据通讯方案设计

采用单片机控制接收ARINC 429总线规范数据,将数据转换成符合USB规范的数据,便于429总线设备与PC机的数据传输,提高了429总线设备的检测效率。     

基于USB接口的PC机读卡器设计

使用通用串行总线(USB)作为PC机读卡器与计算机的通信接口,设计了基于Prolific公司的PL2303芯片的硬件接口电路,并介绍了USBPC机读卡器的设计方法,包括设备端的硬件设计和软件设计     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

USB键盘的设计

采用USB接口的设备越来越普遍，其主要原因在于USB设备连接简单，具备真正的即插即用以及热插拔等特点。Cypress半导体公司的CY7C63413USB控制器整合了USBSIE，通过I／O口以及优化RISCA内核，它满足了USB接口的低价格、高性能两方面的要求，采用它能快速设计出低成本、高性能的USB键盘。     

VBR视频的安置策略与接纳控制

讨论了 VBR视频在磁盘特别是 MZ磁盘上的安置策略、视频文件的组织模式、磁盘 I/ O调度及相应的接纳控制策略 .主要给出了一个比例安置算法和基于缓冲支持下的磁盘 I/ O平滑调度策略 ,模拟实验结果显示提出的算法和调度策略是可行而有效的     

USB总线接口的开发

介绍了USB（通用串行总线）的体系结构和USB信号电平，对USB接口芯片－－PDIUS－BD12的功能作了简要介绍，并且给出了一个微控制器采用80C51单片机的数据采集设备利用PDIUSBD12与USB相连的接口实例，对USB设备的不同开发方法进行了探讨。