tag 标签: power

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  • 热度 4
    2018-8-23 13:31
    3115 次阅读|
    2 个评论
    【博客大赛】再谈power logic转orcad的方法
    曾经在网易博客发过一篇《 关于 E-studio 软件的详细说明 》(链接地址: http://qijie72.blog.163.com/blog/static/28183629200911532922369/ ) 发现有很多的网友关注这块,现抽时间再次整理归纳出一些细节性问题,并重新提供一个 E-studio 软件的下载链接。在这里基础的操作就不再过多重复描述,不清楚的可以通过上面的链接地址去我的网易博客查看原文。 这个 E-studio 软件本人已在 XP 和 win7 系统上测试验证是完全可用的,其他系统上本人尚未测试过,大家可以自行安装测试验证。 部分电脑在安装 E-studio 的过程中,会出现提示丢失 mgc_ddp8_9.dll 等 dll 文件需要重启安装时候,此时不用重启电脑,只需要将文件夹里的 license 文件复制到你的安装目录下覆盖原文件,然后点击确定继续安装直到完成即可。 E-studio 安装完毕后,将 发送到桌面快捷方式,然后双击该图标,可以正常打开软件即表示安装成功。 使用 PADS9.5 打开绘制的原理图 导出 TXT 文本,第一个选项全选,注意输出版本的选择, 2007 以上版本 E-studio 均无法打开,只可以选 2005 或者 2005.2 版本。 建议 最好选择 2005.2 版,如果输出 2005 版,在 E-studio 里打开该文件后,有时会有无法另存为 ASC 文件的情况出现。 将导出的 TXT 文件的第一排文字修改成 “ *PADS-POWERLOGIC-V4.0* DESIGN EXPORT FILE FROM PADS LOGIC V4.0 ”, 并保存。 使用 E-studio 软件直接打开刚保存的这个 TXT 文件。 另存为 DSN 文件后就可以 直接使用 OR CAD 软件打开了。 最后对一些字符、端口等发生堆叠的地方稍做适当调整即可。 几点注意事项: 部分电脑以及部分设计文件, 使用 PADS9.5 版导出 TXT 文件后, 在 E-studio 里打开时 ,有可能会提示如下错误 “ ERROR has occurred during PADS reader execution ” 如果出现这种情况,只需要再安装一个 PADS2005 版软件,将 PADS9.5 导出的 TXT 文件导入 2005 版里,再次导出 2004.X 文件使用即可。注意记得删除掉那些多出来的边框等东东。 在 E-studio 里打开后,注意另存为的 DSN 文件不能直接保存到桌面,否则,将会无法保存,一定要另外指定一个地方保存。 重新给大家提供一个 E-studio 软件的下载链接: https://pan.baidu.com/s/1m-Cn6fsyah9RBkYKp3KZeA 密码: 0ko7 以上内容均属本人实际使用经验,希望能对有需要的朋友有所帮助 . 刚才偶尔百度了一下,发现本人前面的那篇关于 E-studio 软件的详细说明 》博文,被很多的网友转载了,不过有个别人转载过去后却要求人家付费下载,强烈鄙视这种小人! 最后,大家如有其他更好的转换方法,也请互相交流学习!
  • 2014-12-3 19:02
    1493 次阅读|
    0 个评论
    Estimating likely power consumption of a piece of silicon before building it is necessarily an approximate endeavor -- not quite divining the future by poking through chicken bones, but certainly laden with assumptions and approximations. Unfortunately, early estimates are critical to the economic and timely development of world-class designs. You can't just iterate through design, manufacture, and measurement as many times as it takes to get it right.   The gold-standard of pre-silicon estimation starts from a full physical gate-level implementation -- synthesized to final gates and placed-and-routed. Using this representation, with detailed power models for gates, extracted parasitics, and activity files from gate-level simulation, power estimates are claimed to fall within 5% of silicon measurements (with multiple caveats). However, a full implementation cycle takes time (enough time that you are not going to complete more than one a day for a ~1M gate block), and it is difficult to correlate power problems back to the RTL design. So, while an improvement over waiting for silicon, this method is still not well-suited to rapid design-measure-debug iteration.   The electronic system level (ESL) may be the best place to estimate and optimize architecture for power, but either way you have to re-estimate at the RTL (register transfer level) to get the implementation architecture right. This offers the fastest and most direct debug cycle, but with a penalty in accuracy over gate-level estimation. RTL estimation still uses the same Liberty power models used in gate-level estimation and the same simulation testbench, but takes a scientific wild-ass guess (SWAG) at what gates will be mapped to in synthesis, Vth mixes, cell drives, data path optimization, net capacitances, and more. Still, for many purposes at less aggressive nodes, this approach can provide useful guidelines to major implementation decisions.     While basic estimates are often reasonably accurate in terms of overall power, they don't typically stand up well to close examination. If you want to understand, for example, static versus dynamic power components or contributions by module or contributions of memories versus the clock tree, basic analysis can be significantly off. One way to get significant improvement is to calibrate the SWAG estimates against a fully-implemented version of an earlier generation/similar design. Unsurprisingly, mapping Vth mix, drive strengths, capacitance models, and clock trees by clock domains can significantly tighten up estimates at the detail level.   But what if you are working on a new design and you don't have prior examples to guide calibration? Or what if you want to optimize for power at the micro-architectural level -- for example, splitting high-fanout nets and pipelining? To usefully guide decisions in these cases means the estimation tool has to more closely emulate a real implementation flow. In turn, this means close correlation on cell selection module-by-module -- not just threshold mix, but also DesignWare selections. It also means close correlation on drive strengths, interconnect capacitances, and clock tree implementation, all of which require some form of physical prototyping. The trick here is to get a reasonable level of accuracy faster than you can through a full implementation cycle, so you can run through multiple design-measure-debug cycles in one day. Some approximations can be made to help achieve this speed, but your vendor still needs to provide a credible case that they can accomplish reasonable correlation with the real implementation flow.   Getting to really useful RTL power estimation is hard work. We are constantly refining correlation at the component level (static versus dynamic), at the module level, and at the detailed architectural level. If you have additional ideas or feedback on the limitations in RTL power estimation, I'd be very interested to hear them.   Bernard Murphy CTO Atrenta Inc.
  • 热度 1
    2014-10-9 19:22
    1002 次阅读|
    0 个评论
    It's autumn in New England in the United States. The leaves are turning to red, orange, and gold, my roses are in their second bloom, and it's time to remove the air conditioner from the window. On September 22, I opened the window to remove the air conditioner as I've done many times before. For the first time, the air conditioner fell out.   Too often, we focus on the latest and greatest processor, mobile device, or other "cool" product. But sometimes, simple things such as strain relief take on significance and save the day, especially for a "cool" product such as an air conditioner.   The air conditioner never hit the ground. Why? Because with my lightning reflexes, I grabbed the power cord, stopping the fall. Yes, the power cord's strain relief made the difference. There was a thud as the unit hit the side of the house, but it didn't hit the first-floor window directly below.   So here I am with my arm hanging out the second-floor window, holding onto the line cord as the A/C unit dangles. But even with two hands, I had difficulty pulling the unit up. I called for my wife, who came and helped me pull on the cord. The A/C unit came up and I pulled it in.   (Image: Illustration by Daniel Guidera)   There was surprisingly little damage. What's really impressive is that the strain relief of the line cord could hold the weight of the unit and survive the force on it. So, who is the manufacturer of this miraculous air conditioner, anyway? The brand name is Liberty, made in China. Here's a photo of the front-panel controls.     Here's the side-panel label.   As you can see, the physical damage is minimal, just a broken extension panel and a small break where the line cord enters the unit.     I simply had to see the strain relief on the power cord, so I removed the front panel. There, I could see that the strain relief was screwed into the metal chassis.     Next, I removed the control panel to get a look at the connections from the power cord to the circuits inside the unit. They were perfectly intact, thanks to the strain relief. The photo below shows the power cord connected to a large capacitor that reads "35/6 µF."   I then reassembled the unit plugged it into an AC outlet that had a dedicated circuit breaker, and turned it on. It worked, but I won't use it again in its current condition. Close inspection of the power cord revealed some damage, as the photo below shows. There's even a label on the cord telling you not to use it if the internal shielding is visible. The label says:   The conductors inside this cord are covered by shields, which monitor leakage current. THESE SHIELDS ARE NOT GROUNDED. Periodically examine the cord for any damage. DO NOT USE THIS PRODUCT in the event the shield becomes exposed.     Clearly, covering the cut with electrical tape isn't an option here. I'll need either to replace the power cord or use another air conditioner next year. I have one in a closet that hasn't been needed in this house.   What was that about leakage current? To find out, I called Tower Manufacturing of Providence, Rhode Island, maker of the power cord, and spoke to an engineer. The power cord has an LCDI (line-current detection interrupter) at the wall-outlet end. It's essentially a circuit breaker that trips based on leakage current. The LCDI cuts power to the unit if it detects about 5 mA. The engineer explained that LCDIs were developed for air conditioners. The problem grew from power cords that failed over time, sometimes causing fires. People would wrap the power cord around the unit and put it away for the winter. Over time, the cords would develop shorts. The LCDIs comply with UL 1699 .     I asked if the company manufactured assembled AC line cords or just the LCDIs. Tower manufactures line cords for several air conditioner manufacturers, some are completely assembled with terminations (spade lugs) and some without. There are plenty of online sellers of air-conditioner power cords, but Liberty is not an everyday name. A quick look at one seller didn't show the brand name. This one looks promising, but I'll have to gain access to the power cord again for another inspection of the terminations. I have plenty of time for that, given the length of winters here. But, I might just employ the unused air conditioner and let this one go (figuratively, that is). More homework is required. Next year, I'll probably install a support bracket under the unit, regardless of which one I put in the window.   This experience shows the importance of strain relief. Remember that strain relief, connectors, and even screws are important. They may not be "cool," but they can save the day.
  • 2013-1-25 14:54
    1166 次阅读|
    0 个评论
    Universal Serial Bus (USB) is ubiquitous. What if you were given an option to just carry a USB cable, as against a bunch of power adapters to charge your tablet, ultrabook and smartphone? Sounds too good to be true, right?   In August 2012 USB Implementers Forum (the governing body for USB Standard) released a specification—USB Power Delivery (USB PD) that will allow up to 100W of power to be delivered over USB’s power pin!   The new standard (USB PD) allows interconnected devices to negotiate power requirements, and allows devices with abundant power to share it with other devices in the network. Devices like monitors, docking stations, printers and PD-enabled power adapters will source power through their USB ports. Gone will be the days when your power adapter had a custom barrel plug for a dedicated notebook! The power adapters of the future will sport USB ports to charge your devices, including notebooks.   Industry leaders have started working on these lines and come 2014 will see your device’s USB ports supplying higher levels of power. The new standard will co-exist with existing USB eco-system and work equally well with USB 2.0 and USB 3.0.    - Subramanyam Sankaran, Director, USB 2.0 Business Unit, Data Communication Division, Cypress Semiconductor   Subramanyam SankaranIn his current role, Subramanyam Sankaran manages USB 2.0 business for the worldwide market. Subramanyam has been associated with the semiconductor industry for 17 years and has been involved with USB for 14.   Subramanyam has previously worked with Philips/NXP Semiconductors, ST-Ericssion and Maxim in various marketing and engineering management roles.   Subramanyam received his management degree from University of Phoenix and his undergraduate degree in electronics and communication engineering from Bangalore University.
  • 2013-1-24 15:36
    1745 次阅读|
    0 个评论
    Universal Serial Bus (USB) is ubiquitous. What if you were given an option to just carry a USB cable, as against a bunch of power adapters to charge your tablet, ultrabook and smartphone? Sounds too good to be true, right?   In August 2012 USB Implementers Forum (the governing body for USB Standard) released a specification—USB Power Delivery (USB PD) that will allow up to 100W of power to be delivered over USB’s power pin!   The new standard (USB PD) allows interconnected devices to negotiate power requirements, and allows devices with abundant power to share it with other devices in the network. Devices like monitors, docking stations, printers and PD-enabled power adapters will source power through their USB ports. Gone will be the days when your power adapter had a custom barrel plug for a dedicated notebook! The power adapters of the future will sport USB ports to charge your devices, including notebooks.   Industry leaders have started working on these lines and come 2014 will see your device’s USB ports supplying higher levels of power. The new standard will co-exist with existing USB eco-system and work equally well with USB 2.0 and USB 3.0.   - Subramanyam Sankaran, Director, USB 2.0 Business Unit, Data Communication Division, Cypress Semiconductor In his current role, Subramanyam Sankaran manages USB 2.0 business for the worldwide market. Subramanyam has been associated with the semiconductor industry for 17 years and has been involved with USB for 14.   Subramanyam has previously worked with Philips/NXP Semiconductors, ST-Ericssion and Maxim in various marketing and engineering management roles.   Subramanyam received his management degree from University of Phoenix and his undergraduate degree in electronics and communication engineering from Bangalore University.
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    时间: 2019-12-27 20:56
    大小: 54.56KB
    上传者: wsu_w_hotmail.com
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    时间: 2019-12-27 20:57
    大小: 93.76KB
    上传者: 微风DS
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