共查询到19条相似文献,搜索用时 125 毫秒
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USB2.0控制器CY7C68013特点与应用 总被引:6,自引:0,他引:6
介绍USB2.0协议以及Cypress公司推出的USB2.0控制器CY7C680313。USB2.0协议提供480Mb/s的传输速度,向下完全兼容流行的USB1.1协议。CY7C68013是USB2.0的完整解决方案,该芯片包括带8.5KB片上RAM的高速8051单片机,4KB FIFO存储器以及通用可编程接口(GPIF0,串行接口引擎(SIE)和USB2.0收发器,无需外加芯片即可完成高速USB传输,性价比较高。 相似文献
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由于USB总线的诸多优点,传统的低速外围设备正越来越多地朝着USB总线的方向发展。设计一种低成本的USB协议转换器不仅可以保护大量已有的成熟设计,而且可以在一定程度上适应计算机的快速更新换代。文章介绍了一个通用的USB1.1协议转换方案、并以PS/2—USB的协议转换为例,给出了一个基于CY7C63001的软硬件设计参考。 相似文献
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为了满足两个USB设备之间直接进行数据通信的需求,通过对现有USB OTG协议和相关应用的研究,在国产SoC芯片SEP6200平台上设计并实现了基于Linux内核的USB OTG模块驱动。首先介绍了OTG标准中的对话请求协议(SRP)和主机交换协议(HNP),然后制定并设计了基于USB控制芯片USB3343的硬件模块方案,最后根据Linux内核中已有的USB驱动架构完成了USB OTG设备驱动的设计,并最终实现了SEP6200嵌入式平台USB Host和De-vice角色的自由转换功能。 相似文献
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USB已经成为一种非常成功的总线标准。以USB在一个嵌入式系统的实现案例,介绍了USB总线的硬件研发过程及相关USB协议栈的设计与实现,并且探讨了在嵌入式操作系统中基于该协议栈的USB设备驱动的开发以及USB Bios Boot Rom的设计。 相似文献
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USB2.0控制器CY7C68013特点与应用 总被引:3,自引:0,他引:3
介绍USB2.0协议以及Cypress公司推出的USB2.0控制器CY7C68013.USB2.0协议提供480 Mb/s的传输速度,向下完全兼容流行的USB1.1协议.CY7C68013是USB2.0的完整解决方案.该芯片包括带8.5 KB片上RAM的高速8051单片机、4 KB FIFO存储器以及通用可编程接口(GPIF)、串行接口引擎(SIE)和USB2.0收发器,无需外加芯片即可完成高速USB传输,性价比较高. 相似文献
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研究利用Windows设备驱动开发包(DDK)开发USB驱动程序的方法,应用WDM驱动模型开发驱动程序,实现了USB驱动的即插即用(PnP)、电源管理、USB初始化和USB设备I/O等功能模块.该方法具有结构清晰、易移植、复用性好等优点,在USB驱动程序设计中具有良好的应用价值. 相似文献
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介绍USB在数据采集系统中的应用,基于当前USB数据采集系统的一些不足,提出一种同时实现USB主机和设备双角色(DRD)的方案。详细讲述了利用C8051F020和USB双角色器件SL811HS设计USB主机/设备接口,重点分析了如何实现主机/设备模式的转换的方法,并给出了硬件的关键电路和软件结构。 相似文献
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提出一种新型环境参数监测仪,基于USB HOST技术设计,嵌入式USB主机系统采用SM5964单片机加上USB主从芯片CH375的结构,实现USB1.1主机协议和USB mass storage类,从而通过对U盘的各种操作将采集到的环境参数(声音响度、温度)存入U盘,以其为媒介向上位机完成数据反馈。应用实践证明,该仪器广泛适用于居民小区、交通要道等不同环境下,且简易便携,有较好的市场前景。 相似文献
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分析USB通讯设备类(CDC)协议的机制与流程,讨论CDC协议中的以太网控制模型(ECM)的框架与接口.在CDC的ECM基础上实现USB虚拟以太网接口,对USB虚拟以太网接口与物理以太网接口的性能进行测试与比较,指出USB虚拟以太网接口相对物理以太网接口的特点,为进一步研究USBCDC协议提供参考. 相似文献
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本文介绍了如何用Microsoft公司提供的驱动程序开发包(DDK)工具开发win2000/xp下的USB设备驱动程序。首先概述了USB驱动程序体系结构Windows驱动程序模型等用于开发USB设备驱动程序背景知识。然后深入的讲述了用DDK编写USB设备驱动程序必须用到的几个关键技术,包括USB设备驱动程序入口与初始化、如何建立并提交USB请求块(URB)给总线驱动程序(USBD)、USB设备如何配置、USB四种通信管道的管理等四个方面。 相似文献
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Universal Serial Bus (USB) is a popular choice of interfacing computer systems with peripherals. With the increasing support of modern operating systems, it is now truly plug-and-play for most USB devices. However, this great convenience comes with a risk that can allow a device to perform arbitrary actions at any time while it is connected. Researchers have confirmed that a simple USB device such as a mass storage device can be disguised to have an additional functionality such as a keyboard. An unauthorized keyboard attachment can compromise the security of the host by allowing arbitrary keystrokes to enter the host. This undetectable threat differs from traditional virus that spreads via USB devices due to the location where it is stored and the way it behaves. We propose a novel way to protect the host via a software/hardware solution we named a USBWall. USBWall uses BeagleBone Black (BBB), a low-cost open-source computer, to act as a middleware to enumerate the devices on behalf of the host. We developed a program to assist the user to identify the risk of a device. We present a simulated USB device with malicious firmware to the USBWall. Based on the results, we confirm that using the USBWall to enumerate USB devices on behalf of the host eliminates risks to the hosts. 相似文献
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微软CryptoAPI/CryptoSPI是一种广泛应用的PKI(Public Key Infrastructure)应用架构,应用程序通过CryptoAPI(Cryptographic Application Programming Interface)公共接口使用CSP(Cryptographic Service Provider)提供的密码服务.USB KEY是一种直接在个人计算机的USB接口上使用的智能卡设备,使用方便、安全性高、运算能力强.研究和设计了一套基于USB KEY的CSP中间件模块,为PKI体系应用提供了高强度的安全保障. 相似文献
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The article discusses the IEEE 1394 networking standard, otherwise known as FireWire. FireWire was designed to link personal computers, digital cameras, televisions, DVD players, printers, and other home electronics equipment. At the time FireWire seemed like a perfect idea whose time had come, but there was one small problem: a competing technology, called Universal Serial Bus (USB), promised to do nearly the same thing. Like FireWire, USB can connect multiple peripherals to a single port on the back of our computers. But USB is designed to be a simpler, slower interface that is less expensive to manufacture. Because both technologies arrived at about the same time, hardware and software vendors had to make a choice as to which technology to develop and support. USB got the nod in the Wintel world-with Windows driver support for USB peripherals as early as October 1996-but it wasn't until Windows 98 that consumers got full OS support for USB. Early support on the Wintel platform, however, could account for the large number of USB components that have been popping up over the past two years, such as speakers, joysticks, printers, video cameras, and the like, all of which have made it to market much more quickly than FireWire based technologies. The prospect of the increasing use of FireWire is discussed 相似文献