来自Spartan-3 XC3S1500-4FG320差分输出缓冲器的信号失真

示波器轨迹看起来像逻辑分析仪捕获，而不是模拟波形。
建议您生成适当的示波器波形，显示相对于被探测信号的信号幅度，边缘形状和触发电压。
然后让我们看看你有什么。
另外，请描述用于输出的IOSTANDARD和VCCO电源电压。
并且任何终止都应用于信号。
- 鲍勃埃尔金德
签名：新手的自述文件在这里：http：//forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369总结：1。
阅读手册或用户指南。
你读过手册了吗？
你能找到手册吗？2。
搜索论坛（并搜索网页）以寻找类似的主题。
不要在多个论坛上发布相同的问题。
不要在别人的主题上发布新主题或问题，开始新的主题！5。
学生：复制代码与学习设计不同.6“它不起作用”不是一个可以回答的问题。
提供有用的详细信息（请与网页，数据表链接）.7。
您的代码中的评论不需要支付额外费用。
我没有支付论坛帖子的费用。
如果我写一篇好文章，那么我一无所获。



以下为原文

The scope traces look like logic analyser captures, not analogue waveforms.  Suggest you generate proper scope waveforms which show signal amplitude, edge shape, and trigger voltage relative to the signal being probed.  Then let's see what you've got.
 
Also, please describe the IOSTANDARD being used for the outputs, and the VCCO supply voltage.  And any termination applied to the signals.
 
-- Bob Elkind
SIGNATURE:
README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369

Summary:
1. Read the manual or user guide.  Have you read the manual? Can you find the manual?
2. Search the forums (and search the web) for similar topics.
3. Do not post the same question on multiple forums.
4. Do not post a new topic or question on someone else's thread, start a new thread!
5. Students: Copying code is not the same as learning to design.
6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please).
7. You are not charged extra fees for comments in your code.
8. I am not paid for forum posts.  If I write a good post, then I have been good for nothing.

以下是使用模拟示波器捕获的信号，它们显示正确的响应。
这些信号映射到LVDS_25。
IOVCC必须是2.5V，我可以为它们提供3.3V IOVCC吗？
外部没有任何终止。
谢谢。
Spartan_User



以下为原文

Here are the signals captured with analog scope and they show the right response.
These signals are mapped to LVDS_25. Does the IOVCC has to be 2.5V, can I supply them with 3.3V IOVCC?
I do not have any termination externally.
Thanks.
Spartan_User

你能描述上面拍摄的范围吗，你说中间的轨迹是CLK，这看起来是否正确它还有问题？如果有尝试再次单端，以确保单个结束的CLK是你所期望的。-J
--------------------------------------------------
-----------------------不要忘记回答，kudo，并接受为解决方案.-------------
--------------------------------------------------
----------



以下为原文

Can you describe the scope shot above, you say the middle trace is CLK, this looks correct is there still a problem with it?

If there is try making it single ended again to ensure the single Ended CLK is as you are expecting.

-J-------------------------------------------------------------------------
Don’t forget to reply, kudo, and accept as solution.
-------------------------------------------------------------------------

不，这不是问题。
谢谢。
Spartan_User



以下为原文

No, it's not a problem.
Thanks.
Spartan_User