PCB设计问题集锦 问：PCB图中各种字符往往容易叠加在一起，或者相距很近，当板子布得很密时，情况更加严重。当我用Verify Design进行检查时，会产生错误，但这种错误可以忽略。往往这种错误很多，有几百个，将其他更重要的错误淹没了，如何使Verify Design会略掉这种错误，或者在众多的错误中快速找到重要的错误。 答：可以在颜色显示中将文字去掉,不显示后再检查;并记录错误数目。但一定要检查是否真正属于不需要的文字。 问： What’s mean of below warning:(6230,8330 L1) Latium Rule not checked: COMPONENT U26 component rule.答：这是有关制造方面的一个检查，您没有相关设定，所以可以不检查。 问： 怎样导出jop文件？答：应该是JOB文件吧？低版本的powerPCB与PADS使用JOB文件。现在只能输出ASC文件，方法如下STEP：FILE/EXPORT/选择一个asc名称/选择Select ALL/在Format下选择合适的版本/在Unit下选Current比较好/点击OK/完成然后在低版本的powerPCB与PADS产品中Import保存的ASC文件，再保存为JOB文件。 问： 怎样导入reu文件？答：在ECO与Design 工具盒中都可以进行，分别打开ECO与Design 工具盒，点击右边第2个图标就可以。 问： 为什么我在pad stacks中再设一个via:1(如附件）和默认的standardvi(如附件）在布线时V选择1，怎么布线时按add via不能添加进去这是怎么回事，因为有时要使用两种不同的过孔。答：PowerPCB中有多个VIA时需要在Design Rule下根据信号分别设置VIA的使用条件，如电源类只能用Standard VIA等等，这样操作时就比较方便。详细设置方法在PowerPCB软件通中有介绍。 问：为什么我把On-line DRC设置为Prevent..移动元时就会弹出(图2),而你们教程中也是这样设置怎么不会呢?答：首先这不是错误,出现的原因是在数据中没有BOARD OUTLINE.您可以设置一个,但是不使用它作为CAM输出数据. 问：我用ctrl+c复制线时怎设置原点进行复制，ctrl+v粘帖时总是以最下面一点和最左边那一点为原点 答： 复制布线时与上面的MOVE MODE设置没有任何关系,需要在右键菜单中选择,这在PowerPCB软件通教程中有专门介绍. 问：用(图4)进行修改线时拉起时怎总是往左边拉起(图5)，不知有什么办法可以轻易想拉起左就左，右就右。答： 具体条件不明,请检查一下您的DESIGN GRID,是否太大了. 问： 好不容易拉起右边但是用(图6)修改线怎么改怎么下面都会有一条不能和在一起，而你教程里都会好好的(图8)答：这可能还是与您的GRID 设置有关,不过没有问题,您可以将不需要的那段线删除.最重要的是需要找到布线的感觉,每个软件都不相同,所以需要多练习。 问： 尊敬的老师:您好！这个图已经画好了，但我只对（如图1）一种的完全间距进行检查，怎么错误就那么多，不知怎么改进。请老师指点。这个图在附件中请老师帮看一下，如果还有什么问题请指出来，本人在改进。谢！！！！！答：请注意您的DRC SETUP窗口下的设置是错误的,现在选中的SAME NET是对相同NET进行检查,应该选择NET TO ALL.而不是SAME NET有关各项参数的含义请仔细阅读第5部教程. 问： U101元件已建好，但元件框的拐角处不知是否正确，请帮忙CHECK 答：元件框等可以通过修改编辑来完成。问： U102和U103元件没建完全，在自动建元件参数中有几个不明白：如：SOIC--》silk screen栏下spacing from pin与outdent from first pin对应U102和U103元件应写什么数值，还有这两个元件SILK怎么自动设置，以及SILK内有个圆圈怎么才能画得与该元件参数一致。 答：Spacing from pin指从PIN到SILK的Y方向的距离,outdent from first pin是第一PIN与SILK端点间的距离.请根据元件资料自己计算。
上传时间： 2014-01-03
上传用户：Divine
* CONSTRAINTS * This module does not handle data which is considered out of range by the * application(i.e. fixed constants which represent error condition) * * Maximum weight value must be limited to 128 to Prevent an overflow * condition during the calculation. * * The internal data type must be large enough to handle the calculations. * The maximum possible internal value * = Max Input Value * (weight - 1) + Max Input Value * If a maximum weight of 128 is used, the internal data type should be 2 * times the size of the input data type.
标签： CONSTRAINTS considered module handle
上传时间： 2015-09-07
上传用户：qunquan
eye detection sample in matlab. Eyetrackers can analyze a driver’s level of attentiveness while driving and Prevent drowsiness from causing accidents.
标签： attentiveness Eyetrackers detection analyze
上传时间： 2015-10-16
上传用户：xzt
Every day, patches are created to cover up security holes in software applications and operating systems. But by the time you download a patch, it could be too late. A hacker may have already taken advantage of the hole and wreaked havoc on your system. This innovative book will help you stay one step ahead. It gives you the tools to discover vulnerabilities in C-language-based software, exploit the vulnerabilities you find, and Prevent new security holes from occurring.
标签： applications operating security software
上传时间： 2015-11-01
上传用户：fhzm5658
This code was used to produce simulation results described in: Using Directional Antennas to Prevent Wormhole Attacks Lingxuan Hu and David Evans. Network and Distributed System Security Symposium, San Diego, 5-6 February 2004.
标签： Directional simulation described Antennas
上传时间： 2014-12-06
上传用户：xieguodong1234
Basic hack v2.1 by xgx - http://www.ring0.donster.de/ Features: - Smooth Vector Aimbot - Full ESP ( Namen,Weapon,Distance,Visible,Far) - polymorph,peb hiding to Prevent VAC detection
标签： Features donster Aimbot Smooth
上传时间： 2013-12-18
上传用户：agent
WareSeeker periodically updates pricing and software information of Embedded Windows CE SAPI 5.0 Free Download from the publisher, so some information may be slightly out-of-date. You should confirm all information before relying on it. Software piracy is theft, Using Embedded Windows CE SAPI 5.0 Free Download crack, password, serial numbers, registration codes, key generators is illegal and Prevent future development of Embedded Windows CE SAPI 5.0 Free Download Edition.
标签： periodically information WareSeeker Embedded
上传时间： 2014-01-11
上传用户：坏坏的华仔
The Inter IC bus or I2C bus is a simple bidirectional two wire bus designed primarily for general control and data transfer communication between ICs. Some of the features of the I2C bus are: • Two signal lines, a serial data line (SDA) and a serial clock line (SCL), and ground are required. A 12V supply line (500mA max.) for powering the peripherals often may be present. • Each device connected to the bus is software addressable by a unique address and simple master/ slave relationships exist at all times masters can operate as master-transmitters or as master-receivers. • The I2C bus is a true multi-master bus including collision detection and arbitration to Prevent data corruption if two or more masters simultaneously initiate data transfer systems. • Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 KBit/s in the standard mode or up to 400 KBit/s in the fast mode.
标签： bus bidirectional primarily designed
上传时间： 2013-12-11
上传用户：jeffery
The invention of the compound additive for alkaline PH value of more than 13 strong base will not only be able to Prevent soil acidification, can effectively improve the soil acidic, as well as the rich soil of minerals, in the air to absorb the carbon and nitrogen for The use of plants.
标签： invention compound additive alkaline
上传时间： 2013-12-08
上传用户：xauthu
很丰富的 Registry 改动例子，很多特别的例子 如: Change The Internet explorer Title, Showing the Windows Version on the Desktop Remove the shortcut arrows from all your icons Creating 3D Window Effect To Prevent any changes to the Start Menu Disable Registry Editing Tools
标签： Registry
上传时间： 2017-02-11
上传用户：爺的气质
