通用串行总线数据采集卡的设计

范文编号:JD196       字数:21413,页数:48      

摘 要
本文基于USB2.0协议设计了通用串行总线数据采集卡。范文中详细介绍了USB2.协议， USB控制芯片EZ-USB FX2和A/D转换芯片ADS8364的使用方法,数据采集卡的硬件组成原理及工作过程.。范文涉及了ADS8364与CPLD的接口电路，用VHDL硬件描述语言编写的主要源程序片段及其仿真时序，固件程序（C51）的编写与及加载。该系统主要利用USB2.0总线作为传输通道，利用CPLD作为控制器，实现了数据的高速采集。通过USB设备硬件，固件和CPLD芯片的开发和实现，形成可以用USB总线传输数据的采集系统。通过CPLD实现对A/D芯片的控制，并控制采样数据送进FIFO中，最后数据由USB总线传入USB主机。
关键词：   USB2.0    数据采集     固件      CPLD

Abstract
The paper aims at designing data capture based on USB2.0 specification. The specification of USB2.0, the operation method of EZ-USB FX2 USB microcontroller and analog-to-digital converters ADS8364 and the principle and working process of hardware of data capture are introduced in detail. The interface circuit between ADS8364 and CPLD, the main source procedure part writing with the VHDL hardware description language plait and its imitation are involved in this paper as well as the writing and download of firmware. USB2.0 is used as a transmission channel and CPLD as a controller by the system, which realizes the high-speed capture. Through the USB equipment hardware, the firmware and the CPLD chip development and the realization, forms may use the USB main line to transmit the data gathering system.Through the CPLD realization to the A/D chip control, and controls the sampling data to feed in FIFO, the final data spreads to the USB main engine from the USB main line.
Keyword:  USB2.0   Data Capture   Firmware    CPLD

目 录
摘要 ........................................................................2
ABSTRACT ....................................................................3
第一章绪论 .................................................................6
第二章 USB2.0传输协议概述....................................................7
2.1 USB系统结构 .............................................................7
2.1.1 USB主机 ...............................................................7
2.1.2 USB设备 ...............................................................8
2.1.3 USB系统的物理拓扑结构 .................................................11
2.1.4 USB系统逻辑拓扑 .......................................................12
2.2 数据传输类型 ............................................................12
2.2.1 块传输 ................................................................12
2.2.2 中断传输 ..............................................................14
2.2.3 同步传输 ..............................................................16
2.2.4 控制传输...............................................................17
2.3 USB设备的枚举过程........................................................20
第三章硬件组成原理 .........................................................22
3.1芯片介绍 .................................................................22
3.1.1 芯片的选取.............................................................22
3.1.2 芯片简介...............................................................24
3.2 采集原理 ................................................................25
3.3 数据采集、存储模块设计...................................................26
3.4 USB接口模块设计..........................................................27
3.5 抗干扰措施 ..............................................................30
第四章软件设计 ..............................................................31
4.1 固件程序设计 ............................................................31
4.2 固件程序规划 ............................................................32
4.3 固件的编写...............................................................34
4.4 CPLD芯片设计.............................................................36
结束语 ......................................................................39
致  谢 ......................................................................40
参考文献 ....................................................................41
附  录...................................................................... 42

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