怎么知道驱动强度是否足够？

b，
有适合您的工具和模型（计算/模拟）。
它被称为信号完整性工程，CAD工具被称为信号完整性工程计算机辅助设计工具（SI CAD）。
这些模型被称为IBIS模型，它们出现在设备制造商的网站上（如Xilinx）
http://www.xilinx.com/products/design_resources/signal_integrity/resource/si_simulation.htm
我使用Mentor的Hyperlynx，但支持所有CAD工具（我们的网络工程师可以使用工具来帮助客户解决他们的pcb和设计问题）。
http://www.xilinx.com/prs_rls/partners/0400xlnx_mentor.htm
Austin Lesea主要工程师Xilinx San Jose



以下为原文

b,
 
There are tools and models to do this for you (the calculations/simulation).  It is know as signal integrity engineering, and the CAD tools are known as Signal Integrity Engineering Computer Aided Design Tools (SI CAD).

The models are known as IBIS models, and they appear on the device manufacturer's websites (like Xilinx')
 
http://www.xilinx.com/products/design_resources/signal_integrity/resource/si_simulation.htm
 
I use Mentor's Hyperlynx, but all CAD tools are supported (our webcase engineers have access to the tools to help custoemrs resolve problems with their pcbs and designs).
 
http://www.xilinx.com/prs_rls/partners/0400xlnx_mentor.htm
 
 
Austin Lesea
Principal Engineer
Xilinx San Jose

在一些正常情况下，有经验的工程师会根据他们的经验判断，对吗？非常感谢。



以下为原文

And in some normal cases, experienced engineer will judge through their experience, right?

Thanks very much.

根据我的经验，您可以计算得到一个良好的起点，但最终，您需要在进行测试和验证时进行测量和调整。
由于驱动强度太低不会造成任何损坏（结果通常是因为物理信号在正确的时间内无法达到所需的电压水平而导致设计“不起作用”），如果可以的话
不会进行计算，然后选择低驱动强度并试一试。
除非您创建比特流的迭代时间是以天而不是分钟来衡量，在这种情况下，请做一些总和。
问候，
霍华德
----------“我们必须学会做的事情，我们从实践中学习。”
- 亚里士多德



以下为原文

In my experience you can calculate to get a good starting point but, ultimately, you'll need to measure and adjust as you go through test and verification.
 
As it is unlikely that too low a drive strength will cause any damage (the result will usually be that your design "doesn't work" because the physical signals can't reach the desired voltage levels in the correct time), if you can't/won't do the calculations then pick a low drive strength and try it out.
 
Unless your iteration time to create a bitstream is measured in days rather than minutes, in which case, do some sums.
 
Regards,
 
Howard
  
----------
"That which we must learn to do, we learn by doing." - Aristotle

非常感谢，hgleamon1



以下为原文

Thanks very much, hgleamon1