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  • pci e PCB设计规范

    This document provides practical, common guidelines for incorporating PCI Express interconnect layouts onto Printed Circuit Boards (PCB) ranging from 4-layer desktop baseboard designs to 10- layer or more server baseboard designs. Guidelines and constraints in this document are intended for use on both baseboard and add-in card PCB designs. This includes interconnects between PCI Express devices located on the same baseboard (chip-to-chip routing) and interconnects between a PCI Express device located “down” on the baseboard and a device located “up” on an add-in card attached Through a connector. This document is intended to cover all major components of the physical interconnect including design guidelines for the PCB traces, vias and AC coupling capacitors, as well as add-in card edge-finger and connector considerations. The intent of the guidelines and examples is to help ensure that good high-speed signal design practices are used and that the timing/jitter and loss/attenuation budgets can also be met from end-to-end across the PCI Express interconnect. However, while general physical guidelines and suggestions are given, they may not necessarily guarantee adequate performance of the interconnect for all layouts and implementations. Therefore, designers should consider modeling and simulation of the interconnect in order to ensure compliance to all applicable specifications. The document is composed of two main sections. The first section provides an overview of general topology and interconnect guidelines. The second section concentrates on physical layout constraints where bulleted items at the beginning of a topic highlight important constraints, while the narrative that follows offers additional insight.  

    标签: pci PCB 设计规范

    上传时间: 2014-01-24

    上传用户:s363994250

  • DN427开关控制器故障保护电压监测

      Have you had the exasperating experience of a laptop orPDA defi antly not responding to your commands? Youfrantically press key after key, but to no avail. As hopeturns to anger (but just before you throw the company’slaptop Through the window) you slam your fi nger againstthe on/off power button. Ten seconds later, your laptopfi nally surrenders and the screen goes black in a highpitched whimper.

    标签: 427 DN 开关控制器 故障保护

    上传时间: 2013-12-10

    上传用户:Vici

  • 国外游戏开发者杂志1998年第三期配套代码

    国外游戏开发者杂志1998年第三期配套代码,包含Adrian Perez的“Peeking Through Portals”的例子和代码

    标签: 1998 开发者 代码

    上传时间: 2015-01-05

    上传用户:banyou

  • 项目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all

    项目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all data going Through this port in both directions. Serial line sniffer是一个串行端口记录工具。它监听指定的串行端口并记录所有通过这个端口的两个方向的数据。 来源:http://freshmeat.net slsnif是一个串行端口日志工具。它监听特殊的串口,记录所有通过这具串口的两个方向的数据。 类别: Development Status: 5 - Production/StableEnvironment: Console (Text Based)Intended Audience: DevelopersLicense: GNU General Public License (GPL)Operating System: LinuxProgramming Language: CTopic: Communications, Debuggers

    标签: serial port specified logging

    上传时间: 2014-01-17

    上传用户:许小华

  • 项目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all

    项目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all data going Through this port in both directions. Serial line sniffer是一个串行端口记录工具。它监听指定的串行端口并记录所有通过这个端口的两个方向的数据。 来源:http://freshmeat.net slsnif是一个串行端口日志工具。它监听特殊的串口,记录所有通过这具串口的两个方向的数据。 类别: Development Status: 5 - Production/StableEnvironment: Console (Text Based)Intended Audience: DevelopersLicense: GNU General Public License (GPL)Operating System: LinuxProgramming Language: CTopic: Communications, Debuggers

    标签: serial port specified logging

    上传时间: 2013-12-12

    上传用户:silenthink

  • The enclosed VB project includes a VB class that implements the Rijndael AES block encryption algori

    The enclosed VB project includes a VB class that implements the Rijndael AES block encryption algorithm. The form in the project runs some test data Through the class.

    标签: implements encryption Rijndael enclosed

    上传时间: 2015-01-30

    上传用户:JIUSHICHEN

  • Overview In this chapter I introduce Borland C++Builder (BCB) and explain what it is about. I also d

    Overview In this chapter I introduce Borland C++Builder (BCB) and explain what it is about. I also devote considerable time to explaining the purpose of this book and the philosophy behind my approach to technical writing. Technical subjects covered in this chapter include Creating a simple Multimedia RAD program that plays movies, WAV files, and MIDI files. Shutting down the BCB RAD programming tools and writing raw Windows API code instead. Creating components dynamically on the heap at runtime. Setting up event handlers (closures) dynamically at runtime. A brief introduction to using exceptions. This topic is covered in more depth in Chapter 5, "Exceptions." A brief introduction to ANSI strings. This subject is covered in more depth in Chapter 3, "C++Builder and the VCL." Using the online help. Greping Through the include and source files that come with the product and with this book.

    标签: introduce Overview Borland Builder

    上传时间: 2014-01-04

    上传用户:小鹏

  • Description: FASBIR(Filtered Attribute Subspace based Bagging with Injected Randomness) is a variant

    Description: FASBIR(Filtered Attribute Subspace based Bagging with Injected Randomness) is a variant of Bagging algorithm, whose purpose is to improve accuracy of local learners, such as kNN, Through multi-model perturbing ensemble. Reference: Z.-H. Zhou and Y. Yu. Ensembling local learners Through multimodal perturbation. IEEE Transactions on Systems, Man, and Cybernetics - Part B: Cybernetics, 2005, vol.35, no.4, pp.725-735.

    标签: Description Randomness Attribute Filtered

    上传时间: 2015-04-10

    上传用户:ynzfm

  • Description: C4.5Rule-PANE is a rule learning method which could generate accurate and comprehensibl

    Description: C4.5Rule-PANE is a rule learning method which could generate accurate and comprehensible symbolic rules, Through regarding a neural network ensemble as a pre-process of a rule inducer. Reference: Z.-H. Zhou and Y. Jiang. Medical diagnosis with C4.5 rule preceded by artificial neural network ensemble. IEEE Transactions on Information Technology in Biomedicine, 2003, vol.7, no.1, pp.37-42. 使用神经网络集成方法诊断糖尿病,肝炎,乳腺癌症的案例研究.

    标签: comprehensibl Description Rule-PANE accurate

    上传时间: 2013-11-30

    上传用户:wcl168881111111

  • Introduction to GPS ToolKit Pro 1.0 GPS ToolKit Pro is an ActiveX object that makes it easy to add

    Introduction to GPS ToolKit Pro 1.0 GPS ToolKit Pro is an ActiveX object that makes it easy to add GPS support to any Visual Basic, Visual C++, Delphi, Excel, or scripting project that supports ActiveX controls. GPS data (including lat/lon, speed, course, altitude, and dozens of other datasets) can be accessed Through GPS ToolKit s properties, and GPS ToolKit s multithreaded event-based architecture notifies your application when data has been updated, saving you from having to write messy polling routines.

    标签: ToolKit Introduction GPS Pro

    上传时间: 2015-04-28

    上传用户:zhuoying119