hoverdsp的博客

EMC（电磁兼容）设计与测试案例分析,很好的EMC分析的书籍。

freescale公司详细介绍LTIB工具的PPT文档，针对PowerPC全系列，非常有用。

VxWorks BSP for Intel IXP425的BSP源代码

Background The term Ethernet refers to the family of local area network (LAN) implementations that includes three principal categories. • Ethernet and IEEE 802.3—LAN specifications that operate at 10 Mbps over coaxial cable. • 100-Mbps Ethernet—A single LAN specification, also known as Fast Ethernet, that operates at 100 Mbps over twisted-pair cable. • 1000-Mbps Ethernet—A single LAN specification, also known as Gigabit Ethernet, that operates at 1000 Mbps (1 Gbps) over fiber and twisted-pair cables. This chapter provides a high-level overview of each technology variant. Ethernet has survived as an essential media technology because of its tremendous flexibility and its relative simplicity to implement and understand. Although other technologies have been touted as likely replacements, network managers have turned to Ethernet and its derivatives as effective solutions for a range of campus implementation requirements. To resolve Ethernet’s limitations, innovators (and standards bodies) have created progressively larger Ethernet pipes. Critics might dismiss Ethernet as a technology that cannot scale, but its underlying transmission scheme continues to be one of the principal means of transporting data for contemporary campus applications. This chapter outlines the various Ethernet technologies that have evolved to date.

Part I Introduction to VxWorks Device Drivers 1 Device Driver Overview 1.1 Device Driver Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1 1.1.1 The Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1 1.1.1.1 Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2 1.1.1.2 Device Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 1.1.1.3 Peripheral Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 1.1.1.4 Bus Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 1.1.2 The Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4 1.1.2.1 VxWorks Kernel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4 1.1.2.2 VxWorks I/O System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4 1.1.2.3 Local File Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5 1.2 Device Driver Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6 1.2.1 Nonblock Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6 1.2.2 Block Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7 1.3 Porting an Existing VxWorks Device Driver . . . . . . . . . . . . . . . . 1–7 2 VxWorks for Alpha Target Platforms 2.1 Supported Microprocessors and Single-Board Computers . . . . . . 2–2 2.2 Supported Buses . . . . . . . . . . . . . . .

VxWorks网络北邮教程 5.7 VxWorks 网络编程 1. VxWorks虚拟网卡应用 2. VxWorks网络概述 3. VxWorks网络程序设计 4. 远程访问服务

本手册读者须具有基本的Windows 操作经验，并且已经参加过03 年八月份的培训： “Tornado 集成开发环境的操作及基于PowerPC/VxWorks 的编程实例”。没有参加过该次 培训的读者，请到http://epc.ihep.ac.cn/report/jicheng.doc 下载相关文档学习，本手 册第一章也将对之做一简单复习。此外，读者最好具有在Windows 下架设简单FTP 服务的 经验。本手册第一章会简单涉及这些内容。

关于485通讯可靠性设计的经典资料 目录如下: CHAPTER 1: OVERVIEW ........................................................................... 1 INTRODUCTION............................................................................................. 1 DATA TRANSMISSION SIGNALS ...................................................................... 1 Unbalanced Line Drivers ......................................................................... 1 Balanced Line Drivers ............................................................................. 1 Balanced Line Receivers.......................................................................... 3 EIA STANDARD RS-422 DATA TRANSMISSION .............................................. 3 EIA STANDARD RS-485 DATA TRANSMISSION .............................................. 6 TRISTATE CONTROL OF AN RS-485 DEVICE USING RTS.................................. 9 SEND DATA CONTROL OF AN RS-485 DEVICE .............................................. 11 CHAPTER 2: SYSTEM CONFIGURATION ............................................ 13 NETWORK TOPOLOGIES............................................................................... 13 TWO WIRE OR FOUR WIRE SYSTEMS............................................................ 13 TERMINATION............................................................................................. 16 BIASING AN RS-485 NETWORK.................................................................... 17 EXTENDING THE SPECIFICATION .................................................................. 19 CHAPTER 3: SELECTING RS-422 AND RS-485 CABLING .................. 20 NUMBER OF CONDUCTORS .......................................................................... 20 SHIELDING ................................................................................................. 20 CABLE CHARACTERISTICS ........................................................................... 20 CHAPTER 4: TRANSIENT PROTECTION OF RS-422 AND RS-485 SYSTEMS.................................................................................................... 23 WHAT DOES A SURGE LOOK LIKE? ................................................................ 23 Surge Specifications............................................................................... 23 Common Mode vs. Differential Mode..................................................... 25 GROUND ¹ GROUND.................................................................................... 26 TRANSIENT PROTECTION USING ISOLATION .................................................. 27 Isolation Theory..................................................................................... 27 Isolation Devices ................................................................................... 28 TRANSIENT PROTECTION USING SHUNTING .................................................. 28 Shunting Theory..................................................................................... 28 Connecting Signal Grounds ................................................................... 29 Shunting Devices ................................................................................... 29 COMBINING ISOLATION AND SHUNTING ....................................................... 29 SPECIAL CONSIDERATION FOR FAULT CONDITIONS....................................... 31 CHOOSING THE RIGHT PROTECTION FOR YOUR SYSTEM ................................. 31