隨著科學技術水平的不斷提高，數字集成電路被廣泛應用。通用串行總線USB(Universal Serial Bus)是計算機與外圍設備互連的標準接口之一，是一種點對點的通信接口，可同時支持多個外圍設備。USB2.0規范的通信速率非常高，其峰值可達480Mbit/s，使得它已經成為目前最流行的外設接口標準。FPGA芯片是今后電子產品發展的趨勢，帶有USB接口的FPGA系統將有很好的市場需求和發展前景。 論文主要從研究FPGA的結構、Xilinx公司Spartan3F系列中的XC3S400的引腳功能、了解FPGA開發流程、熟悉USB2.0的通信協議以及驅動的一些基本知識入手，目的是完成帶有USB接口的FPGA的PCB板的制作和FPGA內部程序的編寫以及USB固件的開發。結合了Cypress公司的上位機，開發了基于USB接口的FPGA和PC機通信系統，能夠進行數據傳輸。論文研究了Xilinx的3S400芯片的內部結構和各個引腳的功能，設計了關于Xilinx的3S400最小系統電路圖，在Xilinx的FPGA的開發環境，編寫了FPGA的代碼。由于FPGA內嵌的USB2.0的內核價格昂貴，需要向生產FPGA的芯片廠商購買，因此論文選擇了外接USB芯片，雖然增加了PCB板的面積，但其開發成本較低，且技術成熟，大多數USB通信研究者進行廣泛研究。論文在詳細介紹了USB2.0的通信協議，Cypress公司生產的CY7C68013芯片的結構，以及其固件的開發基礎上，開發了基于FPGA的USB與PC機的通信系統，該通信系統可以和上位機進行點對點的數據傳輸，為大批量的數據通信產品的開發提供了研究和生產的基礎。
上傳時間： 2013-07-26
上傳用戶：xz85592677
·現在國內網站上流行的USB及RS232接口的PIC全系列編程器.
標簽： nbsp Programmer PIC Serial
上傳時間： 2013-06-22
上傳用戶：thh29
為解決當前計算機串行通訊接口只有USB，難以滿足舊型號設備或某些單片機要求RS232通訊的問題，設計出兩款RS232/USB電路。采用CH341A與MAX223集成電路芯片構建標準9線RS232/USB通用接口轉換器，無需編程。采用CH341A與PIC16F877A構建單片機與計算機之間的USB通訊電路，軟件遵循RS232通訊協議，硬件進行電平轉換。實際使用表明，這兩款產品與計算機端Windows 操作系統下的串口應用程序完全兼容，且通訊過程中無握手失敗現象。 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.
上傳時間： 2013-11-03
上傳用戶：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.
標簽： Demonstration 3200 USB for
上傳時間： 2014-02-27
上傳用戶：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.
上傳時間： 2014-04-03
上傳用戶：lizhizheng88
USB 是英文Universal Serial Bus 的縮寫，中文含義是“通用串行總線”。它是一種應用在PC 領域的新型接口技術。早在1995年，就已經有PC 機帶有USB 接口了，但由于缺乏軟件及硬件設備的支持，這些PC 機的USB 接口都閑置未用。
上傳時間： 2013-10-20
上傳用戶：LIKE
眾志-863系統芯片 USBDC（univer serial bus devce control通用串行總線設備控制芯片，以下簡稱USBDC）是和帶有USB主機控制器的設備進行通信的支持部件，實現和帶有USB主機控制器的設備進行數據交換。 USBDC和APB連接進行寄存器的初始化配置，和DMAC連接進行大量的數據交換。
標簽： control univer serial USBDC
上傳時間： 2015-03-31
上傳用戶：kytqcool
通用串行總線(USB)是一種新興的計算機外圍串行通信接口標準，與常用的計算機接口(如串口、并口等)相比，通用串行總線(Universal Serial Bus，USB)具有熱插拔、即插即用、數據傳輸可靠、擴展方便、低成本等優點。從問世以來，它得到了廣泛的應用，一方面已成為當前計算機必備的接口之一，同時也被廣泛地應用于嵌入式系統設計中。 從1994年USB 0．7出現開始，USB實施者論壇(Implementation Forum)先后定義了USB 0．8、0．9、1．0、1．1、2．0以及USB OTG等規范，以及各種不同的設備類規范。其中USB1．1規范目前正逐步廣泛應用，而USB2．0和USBOTG作為USB協議的更新和擴展，也將使USB占領更廣的外設
上傳時間： 2016-02-17
上傳用戶：王小奇
改變wince上usb的client，可以在serial，mass storage和rndis之間切換。
上傳時間： 2013-12-23
上傳用戶：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
標簽： developped framework software contains
上傳時間： 2017-02-14
上傳用戶：qq1604324866
