附件是一款PCB阻抗匹配計算工具，點擊CITS25.exe直接打開使用，無需安裝。附件還帶有PCB連板的一些計算方法，連板的排法和PCB聯板的設計驗驗。 PCB設計的經驗建議: 1.一般連板長寬比率為1：1~2.5：1,同時注意For FuJi Machine:a.最大進板尺寸為:450*350mm, 2.針對有金手指的部分,板邊處需作掏空處理,建議不作為連板的部位. 3.連板方向以同一方向為優先,考量對稱防呆,特殊情況另作處理. 4.連板掏空長度超過板長度的1/2時,需加補強邊. 5.陰陽板的設計需作特殊考量. 6.工藝邊需根據實際需要作設計調整,軌道邊一般不少於6mm,實際中需考量板邊零件的排布,軌道設備正常卡壓距離為不少於3mm,及符合實際要求下的連板經濟性. 7.FIDUCIAL MARK或稱光學定位點,一般設計在對角處,為2個或4個,同時MARK點面需平整,無氧化,脫落現象;定位孔設計在板邊,為對稱設計,一般為4個,直徑為3mm,公差為±0.01inch. 8.V-cut深度需根據連板大小及基板板厚考量,角度建議為不少於45°. 9.連板設計的同時,需基於基板的分板方式考量<人工(治具)還是使用分板設備>. 10.使用針孔(郵票孔)聯接：需請考慮斷裂后的毛刺,及是否影響COB工序的Bonding機上的夾具穩定工作,還應考慮是否有無影響插件過軌道,及是否影響裝配組裝.
上傳時間： 2014-12-31
上傳用戶：sunshine1402
附件是一款PCB阻抗匹配計算工具，點擊CITS25.exe直接打開使用，無需安裝。附件還帶有PCB連板的一些計算方法，連板的排法和PCB聯板的設計驗驗。 PCB設計的經驗建議: 1.一般連板長寬比率為1：1~2.5：1,同時注意For FuJi Machine:a.最大進板尺寸為:450*350mm, 2.針對有金手指的部分,板邊處需作掏空處理,建議不作為連板的部位. 3.連板方向以同一方向為優先,考量對稱防呆,特殊情況另作處理. 4.連板掏空長度超過板長度的1/2時,需加補強邊. 5.陰陽板的設計需作特殊考量. 6.工藝邊需根據實際需要作設計調整,軌道邊一般不少於6mm,實際中需考量板邊零件的排布,軌道設備正常卡壓距離為不少於3mm,及符合實際要求下的連板經濟性. 7.FIDUCIAL MARK或稱光學定位點,一般設計在對角處,為2個或4個,同時MARK點面需平整,無氧化,脫落現象;定位孔設計在板邊,為對稱設計,一般為4個,直徑為3mm,公差為±0.01inch. 8.V-cut深度需根據連板大小及基板板厚考量,角度建議為不少於45°. 9.連板設計的同時,需基於基板的分板方式考量<人工(治具)還是使用分板設備>. 10.使用針孔(郵票孔)聯接：需請考慮斷裂后的毛刺,及是否影響COB工序的Bonding機上的夾具穩定工作,還應考慮是否有無影響插件過軌道,及是否影響裝配組裝.
上傳時間： 2013-10-15
上傳用戶：3294322651
This white paper discusses how market trends, the need for increased productivity, and new legislation have accelerated the use of safety systems in industrial machinery. This TÜV-qualified FPGA design methodology is changing the paradigms of safety designs and will greatly reduce development effort, system complexity, and time to market. This allows FPGA users to design their own customized safety controllers and provides a significant competitive advantage over traditional microcontroller or ASIC-based designs. Introduction The basic motivation of deploying functional safety systems is to ensure safe operation as well as safe behavior in cases of failure. Examples of functional safety systems include train brakes, proximity sensors for hazardous areas around machines such as fast-moving robots, and distributed control systems in process automation equipment such as those used in petrochemical plants. The International Electrotechnical Commission’s standard, IEC 61508: “Functional safety of electrical/electronic/programmable electronic safety-related systems,” is understood as the standard for designing safety systems for electrical, electronic, and programmable electronic (E/E/PE) equipment. This standard was developed in the mid-1980s and has been revised several times to cover the technical advances in various industries. In addition, derivative standards have been developed for specific markets and applications that prescribe the particular requirements on functional safety systems in these industry applications. Example applications include process automation (IEC 61511), machine automation (IEC 62061), transportation (railway EN 50128), medical (IEC 62304), automotive (ISO 26262), power generation, distribution, and transportation. 圖Figure 1. Local Safety System
上傳時間： 2013-11-14
上傳用戶：zoudejile
Introduction to Xilinx Packaging Electronic packages are interconnectable housings for semiconductor devices. The major functions of the electronic packages are to provide electrical interconnections between the IC and the board and to efficiently remove heat generated by the device. Feature sizes are constantly shrinking, resulting in increased number of transistors being packed into the device. Today's submicron technology is also enabling large-scale functional integration and system-on-a-chip solutions. In order to keep pace with these new advancements in silicon technologies, semiconductor packages have also evolved to provide improved device functionality and performance. Feature size at the device level is driving package feature sizes down to the design rules of the early transistors. To meet these demands, electronic packages must be flexible to address high pin counts, reduced pitch and form factor requirements. At the same time,packages must be reliable and cost effective.
上傳時間： 2013-11-21
上傳用戶：不懂夜的黑
Finite state machines are widely used in digital circuit designs. Generally, when designing a state machine using an HDL, the synthesis tools will optimize away all states that cannot be reached and generate a highly optimized circuit. Sometimes, however, the optimization is not acceptable. For example, if the circuit powers up in an invalid state, or the circuit is in an extreme working environment and a glitch sends it into an undesired state, the circuit may never get back to its normal operating condition.
標簽： Creating Machines Mentor State
上傳時間： 2013-11-02
上傳用戶：xauthu
針對嵌入式機器視覺系統向獨立化、智能化發展的要求，介紹了一種嵌入式視覺系統--智能相機。基于對智能相機體系結構、組成模塊和圖像采集、傳輸和處理技術的分析，對國內外的幾款智能相機進行比較。綜合技術發展現狀，提出基于FPGA+DSP模式的硬件平臺，并提出智能相機的發展方向。分析結果表明，該系統設計可以實現脫離PC運行，完成圖像獲取與分析，并作出相應輸出。 Abstract: This paper introduced an embedded vision system-intelligent camera ，which was for embedded machine vision systems to an independent and intelligent development requirements. Intelligent camera architecture， component modules and image acquisition， transmission and processing technology were analyzed. After comparing integrated technology development of several intelligent cameras at home and abroad， the paper proposed the hardware platform based on FPGA+DSP models and made clear direction of development of intelligent cameras. On the analysis of the design， the results indicate that the system can run from the PC independently to complete the image acquisition and analysis and give a corresponding output.
上傳時間： 2013-11-14
上傳用戶：無聊來刷下
Automobiles, aircraft, marine vehicles, uninterruptiblepower supplies and telecom hardware represent areasutilizing series connected battery stacks. These stacksof individual cells may contain many units, reaching potentialsof hundreds of volts. In such systems it is oftendesirable to accurately determine each individual cell’svoltage. Obtaining this information in the presence of thehigh “common mode” voltage generated by the batterystack is more diffi cult than might be supposed.
上傳時間： 2013-10-24
上傳用戶：kang1923
RemoteWAP is a Remote Administration Tool for any Operating System that can support the Java Virtual Machine. It has been designed for anyone who wishes to have complete control of there OS anywhere by using a WAP enabled Mobile Phone. RemoteWAP is developed using Java and WML for the client mobile phone front-end pages. RemoteWAP has a Java Swing-GUI to allow for easy control. Future releases will have a Command Line Interface for quick use
標簽： Administration RemoteWAP Operating Virtual
上傳時間： 2015-02-01
上傳用戶：exxxds
This project provides a proxy that allows telnet/tcp connections to be made to serial ports on a machine.
標簽： connections provides project allows
上傳時間： 2013-11-25
上傳用戶：jjj0202
編譯原理的詞法，語法，分析等，還有勞頓的tiny machine （tm.c）的代碼實現，前面還有相應的匯編程序
標簽： 編譯原理
上傳時間： 2013-12-24
上傳用戶：xz85592677
<table id="gso22"></table> <strike id="gso22"></strike>