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  • pci e PCB設(shè)計規(guī)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.  

    標簽: pci PCB 設(shè)計規(guī)范

    上傳時間: 2014-01-24

    上傳用戶:s363994250

  • Protel使用中的一些問題和解答

    Q01、如何使一條走線至兩個不同位置零件的距離相同?  您可先在Design/Rule/High Speed/Matched Net Lengths的規(guī)則中來新增規(guī)則設(shè)定,最 后再用Tools/EqualizeNet Lengths 來等長化即可。   Q02、在SCHLIB中造一零件其PIN的屬性,如何決定是Passive, Input, I/O, Hi- Z,Power,…..?在HELP中能找到說明嗎?市面有關(guān) SIM?PLD?的書嗎?或貴公司有講義?  你可在零件庫自制零件時點選零件Pin腳,并在Electrical Type里,可以自行設(shè)定PIN的 屬性,您可參考臺科大的Protel sch 99se 里 面有介紹關(guān)于SIM的內(nèi)容。   Q03、請問各位業(yè)界前輩,如何能順利讀取pcad8.6版的線路圖,煩請告知  Protel 99SE只能讀取P-CAD 2000的ASCII檔案格式,所以你必須先將P-CAD8.6版的格式 轉(zhuǎn)為P-CAD 2000的檔案格式,才能讓Protel讀取。

    標簽: Protel

    上傳時間: 2013-11-07

    上傳用戶:tangsiyun

  • multisim10.0仿真軟件破解版下載

    multisim10.0仿真軟件破解版下載:【軟件介紹】 Multisim本是加拿大圖像交互技術(shù)公司(Interactive Image Technoligics簡稱IIT公司)推出的以Windows為基礎(chǔ)的仿真工具,被美國NI公司收購后,更名為NI Multisim ,而V10.0是其(即NI,National Instruments)最新推出的Multisim最新版本。 目前美國NI公司的EWB的包含有電路仿真設(shè)計的模塊Multisim、PCB設(shè)計軟件Ultiboard、布線引擎Ultiroute及通信電路分析與設(shè)計模塊Commsim 4個部分,能完成從電路的仿真設(shè)計到電路版圖生成的全過程。Multisim、Ultiboard、Ultiroute及Commsim 4個部分相互獨立,可以分別使用。Multisim、Ultiboard、Ultiroute及Commsim 4個部分有增強專業(yè)版(Power Professional)、專業(yè)版(Professional)、個人版(Personal)、教育版(Education)、學生版(Student)和演示版(Demo)等多個版本,各版本的功能和價格有著明顯的差異。 NI Multisim 10用軟件的方法虛擬電子與電工元器件,虛擬電子與電工儀器和儀表,實現(xiàn)了“軟件即元器件”、“軟件即儀器”。NI Multisim 10是一個原理電路設(shè)計、電路功能測試的虛擬仿真軟件。 NI Multisim 10的元器件庫提供數(shù)千種電路元器件供實驗選用,同時也可以新建或擴充已有的元器件庫,而且建庫所需的元器件參數(shù)可以從生產(chǎn)廠商的產(chǎn)品使用手冊中查到,因此也很方便的在工程設(shè)計中使用。 NI Multisim 10的虛擬測試儀器儀表種類齊全,有一般實驗用的通用儀器,如萬用表、函數(shù)信號發(fā)生器、雙蹤示波器、直流電源;而且還有一般實驗室少有或沒有的儀器,如波特圖儀、字信號發(fā)生器、邏輯分析儀、邏輯轉(zhuǎn)換器、失真儀、頻譜分析儀和網(wǎng)絡(luò)分析儀等。 NI Multisim 10具有較為詳細的電路分析功能,可以完成電路的瞬態(tài)分析和穩(wěn)態(tài)分析、 時域和頻域分析、器件的線性和非線性分析、電路的噪聲分析和失真分析、離散傅里葉分析、電路零極點分析、交直流靈敏度分析等電路分析方法,以幫助設(shè)計人員分析電路的性能。 NI Multisim 10可以設(shè)計、測試和演示各種電子電路,包括電工學、模擬電路、數(shù)字電路、射頻電路及微控制器和接口電路等。可以對被仿真的電路中的元器件設(shè)置各種故障,如開路、短路和不同程度的漏電等,從而觀察不同故障情況下的電路工作狀況。在進行仿真的同時,軟件還可以存儲測試點的所有數(shù)據(jù),列出被仿真電路的所有元器件清單,以及存儲測試儀器的工作狀態(tài)、顯示波形和具體數(shù)據(jù)等。 NI Multisim 10有豐富的Help功能,其Help系統(tǒng)不僅包括軟件本身的操作指南,更要的是包含有元器件的功能解說,Help中這種元器件功能解說有利于使用EWB進行CAI教學。另外,NI Multisim10還提供了與國內(nèi)外流行的印刷電路板設(shè)計自動化軟件Protel及電路仿真軟件PSpice之間的文件接口,也能通過Windows的剪貼板把電路圖送往文字處理系統(tǒng)中進行編輯排版。支持VHDL和Verilog HDL語言的電路仿真與設(shè)計。 利用NI Multisim 10可以實現(xiàn)計算機仿真設(shè)計與虛擬實驗,與傳統(tǒng)的電子電路設(shè)計與實驗方法相比,具有如下特點:設(shè)計與實驗可以同步進行,可以邊設(shè)計邊實驗,修改調(diào)試方便;設(shè)計和實驗用的元器件及測試儀器儀表齊全,可以完成各種類型的電路設(shè)計與實驗;可方便地對電路參數(shù)進行測試和分析;可直接打印輸出實驗數(shù)據(jù)、測試參數(shù)、曲線和電路原理圖;實驗中不消耗實際的元器件,實驗所需元器件的種類和數(shù)量不受限制,實驗成本低,實驗速度快,效率高;設(shè)計和實驗成功的電路可以直接在產(chǎn)品中使用。 NI Multisim 10易學易用,便于電子信息、通信工程、自動化、電氣控制類專業(yè)學生自學、便于開展綜合性的設(shè)計和實驗,有利于培養(yǎng)綜合分析能力、開發(fā)和創(chuàng)新的能力。 multisim10.0激活碼及破解序列號

    標簽: multisim 10.0 仿真軟件

    上傳時間: 2015-01-03

    上傳用戶:daoyue

  • ADO.NET in a Nutshell is the most complete and concise source of ADO.NET information available. Besi

    ADO.NET in a Nutshell is the most complete and concise source of ADO.NET information available. Besides being a valuable reference, this book covers a variety of issues that programmers face when developing web applications or web services that rely on database access. Most examples use Microsoft s C# language. The book s CD includes an add-in to integrate the reference with Visual Studio .NET help files.

    標簽: information ADO NET available

    上傳時間: 2015-01-11

    上傳用戶:nanfeicui

  • MemCheck Driver Memory Tool The MemCheck code is designed to provide Windows NT/2K/XP driver develop

    MemCheck Driver Memory Tool The MemCheck code is designed to provide Windows NT/2K/XP driver developers with a tool to help in the detection of the following memory handling issues: Buffer overrun Buffer corruption Buffer use after buffer release Double buffer releases

    標簽: MemCheck designed Windows develop

    上傳時間: 2014-12-05

    上傳用戶:weiwolkt

  • Demo程序經(jīng)Keil701編譯后

    Demo程序經(jīng)Keil701編譯后,代碼量為7-8K,可直接在KeilC51上仿真運行。 使用方法:解壓后雙擊yy項目,點調(diào)試即可在串口仿真看到結(jié)果。 Demo程序創(chuàng)建了3個任務(wù)A、B、C優(yōu)先級分別為2、3、4,A每秒顯示一次,B每3秒顯示一次,C每6秒顯示一次。從顯示結(jié)果看,顯示3個A后顯示1個B,顯示6個A和2個B后顯示1個C,結(jié)果顯然正確。用戶可以仿照范例運用更多系統(tǒng)API函數(shù)寫出自己的程序。只要程序中有顯示語句就可以用軟件仿真器看結(jié)果。注意:系統(tǒng)提供的顯示函數(shù)是并發(fā)的,他不是直接顯示到串口,而是先輸出到顯存,用戶不必擔心IO慢速操作影響程序運行。串口輸入也采用了同樣的技術(shù),他使得用戶在CPU忙于處理其他任務(wù)時照樣可以盲打輸入命令。 將EXL2-shell目錄下的文件覆蓋yy目錄下的同名文件,將word.c、yyshell.c、yyshellsub.c、mystring.c加入項目,刪除yy1.c,編譯后調(diào)試即可。輸入help可得到在線幫助,具體命令用法見文章說明。 yangye網(wǎng)友推薦http://www.sics.se/~adam/lwip/網(wǎng)站學習TCPIP,該網(wǎng)站開放源代碼的lwip是專為8bit和16bitMCU設(shè)計的TCPIP協(xié)議棧,已在多種CPU上移植成功,推薦大家下載。

    標簽: Demo Keil 701 程序

    上傳時間: 2014-11-01

    上傳用戶:hopy

  • A simple utility to split a concatenated vCard format file into separate files (IETF RFC 2426 - vCar

    A simple utility to split a concatenated vCard format file into separate files (IETF RFC 2426 - vCard MIME Directory Profile). It splits on the BEGIN:VCARD and END:VCARD tags. It was created to help import a Lotus Organizer export file into Palm Desktop

    標簽: concatenated separate utility simple

    上傳時間: 2013-12-20

    上傳用戶:gxf2016

  • ATmega8 taillight circuitA more complex C program that implements different flashing patterns under

    ATmega8 taillight circuitA more complex C program that implements different flashing patterns under the control of both the push buttons and potentiometer. Use your imagination to come up with some novel ideas here. Remember however that more marks are to be awarded for the quality of the code than for the novelness of the patterns.

    標簽: implements taillight different circuitA

    上傳時間: 2013-11-27

    上傳用戶:zhuimenghuadie

  • 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.

    標簽: introduce Overview Borland Builder

    上傳時間: 2014-01-04

    上傳用戶:小鵬

  • 微型操作系統(tǒng)

    微型操作系統(tǒng),想知道操作系統(tǒng)秘密的初學者可以在這起步。 文件列表: 1 micro-os.img 已編好的軟盤映象。 2 micro-os_kernel.bin 命令核心二進制代碼 3 micro-os_loader.boot 啟動二進制代碼 4 micro-os_loader.asm micro-os_kernel.asm 源文件 用法:1 編譯源文件 2 將loader.boot 用工具寫入軟盤0道0頭1扇區(qū) kernel.bin寫入0.0.2-0.0.n (n<10) 在 0.0.1的最后兩個字節(jié)寫入55h ,aah 3 啟動 有幾個可用命令 help cls quit exit reboot

    標簽: 操作系統(tǒng)

    上傳時間: 2013-12-11

    上傳用戶:zwei41

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