请问XPower Estimator切换率及其目标是什么？

H，
http://www.xilinx.com/products/design_resources/power_central/index.htm
也许如果您阅读每个工具的描述以及它们的作用，您可能会理解。
估算器做到了这一点：它估计。
Xpower试图做得更好，因为它确实有更多的信息（在设计周期的后期）。
但每个都有模仿，如果使用不当或错误，每个都可能是错误的。
Austin Lesea主要工程师Xilinx San Jose
在原帖中查看解决方案



以下为原文

h,
 
http://www.xilinx.com/products/design_resources/power_central/index.htm
 
Perhaps if you read the descriptions of each tool, and what they do, you might understand.
 
The estimator does just that:  it estimates.  Xpower tries to do a better job, as it does have more information (later in the design cycle).  But each has mimitations, and each can be wrong if used poorly or wrongly.
 
 
 
 
 
Austin Lesea
Principal Engineer
Xilinx San JoseView solution in original post

H，
http://www.xilinx.com/products/design_resources/power_central/index.htm
也许如果您阅读每个工具的描述以及它们的作用，您可能会理解。
估算器做到了这一点：它估计。
Xpower试图做得更好，因为它确实有更多的信息（在设计周期的后期）。
但每个都有模仿，如果使用不当或错误，每个都可能是错误的。
Austin Lesea主要工程师Xilinx San Jose



以下为原文

h,
 
http://www.xilinx.com/products/design_resources/power_central/index.htm
 
Perhaps if you read the descriptions of each tool, and what they do, you might understand.
 
The estimator does just that:  it estimates.  Xpower tries to do a better job, as it does have more information (later in the design cycle).  But each has mimitations, and each can be wrong if used poorly or wrongly.
 
 
 
 
 
Austin Lesea
Principal Engineer
Xilinx San Jose

嗨
好的
我下载了XPE的用户指南，但是当我将其结果与xpower（在ise包中）进行比较时，为什么结果不一样？
我读到关于切换目标但我在这一点上有误解
你能解释一下这个问题吗？
问候



以下为原文

hi
ok already; I downloaded the user guide for XPE but when i compare its result with xpower(in ise package) why the results did not as the same?
 
i read about toggle target but i have misunderstand in this point
 
can you explain this issue
 
regards

H，
功率esitmator电子表格使用您提供的数据：它只能与您对设计的理解（CLB的数量，IO，频率和切换率）一样好。
XPower更少依赖于您的个人体验：它使用设计本身的功能，并猜测切换速率。
如果你有一个测试平台，具有足够数量的模拟周期，XPower会做得更好（当你要求它猜测切换率时）。
在任何情况下，我都不希望这些工具提供相同的答案（除非运气好）。
每个工具都以自己的方式使用：早期工作的电子表格，设计的“假设”阶段。
如果它以350 MHz运行，或者如果我以175 MHz运行怎么办？
如果我使用DSP48而不是CLB结构怎么办？
如果我使用所有BRAM怎么办？
XPower曾经有一个非常好的长模拟可用于选择所需电源的大小。
可以减少力量吗？
几乎可以肯定，但是在最差的电压和温度下，最糟糕的工艺角是你设计电源容量（不是最好的情况）。
XPower会低估权力吗？
不太可能，但如果设置不当，或模拟与实际操作不匹配，则可能。
Austin Lesea主要工程师Xilinx San Jose



以下为原文

h,
 
The power esitmator spreadsheet uses data supplied by you:  it is only as good as your understanding of the design (number of CLB's, IO's, frequencies and toggle rates).

XPower relies less on your personal experience:  it uses what it can from the design itself, and makes guesses as to toggle rates.  If you have a test bench, with a sufficent number of cycles of simulation, XPower does an even better job (then when you ask it to guess the toggle rates).
 
In no case would I ever expect the tools to deliver the same answer (unless by luck).
 
Each tool is useful in its own way:  the spreadsheet for early work, the "what if" stage of design.  What if it runs at 350 MHz, or what if I run at 175 MHz?  What if I use DSP48 instead of CLB fabric?  What if I use all the BRAMs?
 
XPower once a very good and long simulation is available is to be used to choose the size of the power supply needed.  Could be power be less?  Almost certainly, but the worst case process corner, at the worst voltage and temperature, is what you design power supply capacity for (not the best case).  Could XPower underestimate the power?  Unlikely, but possible, if it wasn't set up properly, or the simulation does not match real operation.



Austin Lesea
Principal Engineer
Xilinx San Jose

你好
谢谢你的解释
但我在理解什么是翻转率方面存在问题，是否在实施阶段具有实用价值？
等你的回复
问候



以下为原文

Hi
 
Thanks for explanation
but I have problem in understanding what is the toggle rate and is it practical value in implementation stage or not?
 
wait your reply
regards

H，
切换速率是信号线从0变为状态的次数，每次初始化为1次。
因此，例如，时钟具有与频率相同的切换率，或100％。
计数器的最低有效位每隔一个时钟改变一次，因此为50％。
如果你谷歌翻转率，你可以找到很多关于如何估计翻转率的文章。
每次导线改变状态时，电源用于对导线的电容充电或去除电容。
因此，切换率越高，频率越高，功率越大。
每条线上的翻转率估计越准确，否则总体估计就越准确。
Austin Lesea主要工程师Xilinx San Jose



以下为原文

h,
 
Toggle rate is how many times a signal line changes state from 0, to 1 per init of time.
 
So, for example a clock has a toggle rate the same as the frequency, or 100%.
 
The least significant bit of  a counter changes every other clock, so that is 50%.
 
If you google toggle rate, you can find a lot written on how to estimate toggle rates.
 
Every time a wire changes state, powe is used to charge or disharge the capacitance of the wire.
 
So the higher the toggle rate, and the higher the frequency, the larger the power.
 
The more accurate the toggle rate estimation on each wire, the nore accurate the overall estimation.
 
 
Austin Lesea
Principal Engineer
Xilinx San Jose