随着科学技术水平的不断提高，数字集成电路被广泛应用。通用串行总线USB(Universal Serial Bus)是计算机与外围设备互连的标准接口之一，是一种点对点的通信接口，可同时支持多个外围设备。USB2.0规范的通信速率非常高，其峰值可达480Mbit/s，使得它已经成为目前最流行的外设接口标准。FPGA芯片是今后电子产品发展的趋势，带有USB接口的FPGA系统将有很好的市场需求和发展前景。 论文主要从研究FPGA的结构、Xilinx公司Spartan3F系列中的XC3S400的引脚功能、了解FPGA开发流程、熟悉USB2.0的通信协议以及驱动的一些基本知识入手，目的是完成带有USB接口的FPGA的PCB板的制作和FPGA内部程序的编写以及USB固件的开发。结合了Cypress公司的上位机，开发了基于USB接口的FPGA和PC机通信系统，能够进行数据传输。论文研究了Xilinx的3S400芯片的内部结构和各个引脚的功能，设计了关于Xilinx的3S400最小系统电路图，在Xilinx的FPGA的开发环境，编写了FPGA的代码。由于FPGA内嵌的USB2.0的内核价格昂贵，需要向生产FPGA的芯片厂商购买，因此论文选择了外接USB芯片，虽然增加了PCB板的面积，但其开发成本较低，且技术成熟，大多数USB通信研究者进行广泛研究。论文在详细介绍了USB2.0的通信协议，Cypress公司生产的CY7C68013芯片的结构，以及其固件的开发基础上，开发了基于FPGA的USB与PC机的通信系统，该通信系统可以和上位机进行点对点的数据传输，为大批量的数据通信产品的开发提供了研究和生产的基础。
上传时间： 2013-07-26
上传用户：xz85592677
·现在国内网站上流行的USB及RS232接口的PIC全系列编程器.
标签： nbsp Programmer PIC Serial
上传时间： 2013-06-22
上传用户：thh29
为解决当前计算机串行通讯接口只有USB，难以满足旧型号设备或某些单片机要求RS232通讯的问题，设计出两款RS232/USB电路。采用CH341A与MAX223集成电路芯片构建标准9线RS232/USB通用接口转换器，无需编程。采用CH341A与PIC16F877A构建单片机与计算机之间的USB通讯电路，软件遵循RS232通讯协议，硬件进行电平转换。实际使用表明，这两款产品与计算机端Windows 操作系统下的串口应用程序完全兼容，且通讯过程中无握手失败现象。 Abstract: To solve the problem that current computer serial communication only with USB interface can not satisfy with the old type equipments or MCU to communicate with RS232， two kinds of RS232/USB circuit were designed.CH341A and MAX223 integrated circuit chips were used to create a standard 9-line RS232/USB universal interface convertor without programme. CH341A and PIC16F877A chips were adopted to build the USB communication circuit between computers and MCU. The software follows RS232 communication protocol， and the hardware converts electrical levels. Actual practices indicate that the two manufactures are compatible with serial application program of Windows operation system completely，and get avoid of handshake lost.
上传时间： 2013-11-03
上传用户：siying
The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 MicrocontrollerCore. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementationof the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision1.1.This application note describes a demonstration program that has been written for the DK3200 hardwaredemonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to workwith the device, using the HID class as a ready-made device driver for the USB connection.IN-APPLICATION-PROGRAMMING (IAP) AND IN-SYSTEM-PROGRAMMING (ISP)Since the μPSD contains two independent Flash memory arrays, the Micro Controller Unit (MCU) can executecode from one memory while erasing and programming the other. Product firmware updates in thefield can be reliably performed over any communication channel (such as CAN, Ethernet, UART, J1850)using this unique architecture. For In-Application-Programming (IAP), all code is updated through theMCU. The main advantage for the user is that the firmware can be updated remotely. The target applicationruns and takes care on its own program code and data memory.IAP is not the only method to program the firmware in μPSD devices. They can also be programmed usingIn-System-Programming (ISP). A IEEE1149.1-compliant JTAG interface is included on the μPSD. Withthis, the entire device can be rapidly programmed while soldered to the circuit board (Main Flash memory,Secondary Boot Flash memory, the PLD, and all configuration areas). This requires no MCU participation.The MCU is completely bypassed. So, the μPSD can be programmed or reprogrammed any time, anywhere, even when completely uncommitted.Both methods take place with the device in its normal hardware environment, soldered to a printed circuitboard. The IAP method cannot be used without previous use of ISP, because IAP utilizes a small amountof resident code to receive the service commands, and to perform the desired operations.
标签： Demonstration 3200 USB for
上传时间： 2014-02-27
上传用户：zhangzhenyu
The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 Microcontroller Core. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementation of the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision 1.1.This application note describes a demonstration program that has been written for the DK3200 hardware demonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to work with the device, using the HID class as a ready-made device driver for the USB connection.
上传时间： 2014-04-03
上传用户：lizhizheng88
USB 是英文Universal Serial Bus 的缩写，中文含义是“通用串行总线”。它是一种应用在PC 领域的新型接口技术。早在1995年，就已经有PC 机带有USB 接口了，但由于缺乏软件及硬件设备的支持，这些PC 机的USB 接口都闲置未用。
上传时间： 2013-10-20
上传用户：LIKE
众志-863系统芯片 USBDC（univer serial bus devce control通用串行总线设备控制芯片，以下简称USBDC）是和带有USB主机控制器的设备进行通信的支持部件，实现和带有USB主机控制器的设备进行数据交换。 USBDC和APB连接进行寄存器的初始化配置，和DMAC连接进行大量的数据交换。
标签： control univer serial USBDC
上传时间： 2015-03-31
上传用户：kytqcool
通用串行总线(USB)是一种新兴的计算机外围串行通信接口标准，与常用的计算机接口(如串口、并口等)相比，通用串行总线(Universal Serial Bus，USB)具有热插拔、即插即用、数据传输可靠、扩展方便、低成本等优点。从问世以来，它得到了广泛的应用，一方面已成为当前计算机必备的接口之一，同时也被广泛地应用于嵌入式系统设计中。 从1994年USB 0．7出现开始，USB实施者论坛(Implementation Forum)先后定义了USB 0．8、0．9、1．0、1．1、2．0以及USB OTG等规范，以及各种不同的设备类规范。其中USB1．1规范目前正逐步广泛应用，而USB2．0和USBOTG作为USB协议的更新和扩展，也将使USB占领更广的外设
上传时间： 2016-02-17
上传用户：王小奇
改变wince上usb的client，可以在serial，mass storage和rndis之间切换。
上传时间： 2013-12-23
上传用户：koulian
This software package contains the USB framework core developped by ATMEL, as well as a CDC driver for an USB to serial converter. The following files are included : - core/ -> Source code for the framework core -> Makefile for the core - cdc/ -> Source code for the CDC driver -> Makefile for the CDC driver - lib/ -> Lib v3 files for every supported chips - bin/ -> Compiled binaries for every supported chips - ./ -> Makefile for the framework -> Startup file
标签： developped framework software contains
上传时间： 2017-02-14
上传用户：qq1604324866
