请问我想用一对引脚作为LVDS信号，可以配置为双向吗？

我忘了提，我正在使用Spartan 6 lx100



以下为原文

I forgot to mention, i'm using Spartan 6 lx100

查看FPGA系列的库指南。
如果它有一个组件IOBUFDS
（和斯巴达6一样），那么你应该能够做你想做的事。
平时
遇到麻烦的地方是双线终止。
内部DIFF_TERM
不是动态的。
它只能一直存在或根本不存在（通过配置）
如果你在驾驶时有100欧姆，那么你可能需要驾驶两个100欧姆
负载（接收器处的另一个）。
您可以检查您的IO标准
查看是否存在增加输出驱动的BLVDS或其他标准
弥补双重终止。
-  Gabor
-  Gabor



以下为原文

Check the Libraries guide for your FPGA family.  If it has a component IOBUFDS
(as does the Spartan 6), then you should be able to do what you want.  Usually
where you run into trouble is double line termination.  The internal DIFF_TERM
is not dynamic.  It can only be there all the time or not at all (by configuration) so
if you have 100 ohms while driving, then you likely need to drive two 100 Ohm
loads (another at the receiver).  You can check the IO standards for your part
to see if there is a BLVDS or other standard that increases the output drive
to make up for the double termination.
 
-- Gabor
-- Gabor

单独的对最适合带宽和信号完整性。
您将用作双向差分对信号模板的原语是IOBUFDS。
对于Spartan-6系列，请参阅UG615。
您是否已安装Document Navigator？
DocNav是一个很好的工具，可以快速查找所需的最新信息。
你可以在这里找到DocNav的链接等等。
- 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。
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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

Separate pairs is best for bandwidth and signal integrity.
 
The primitive you would use as a template for bidirectional diff-pair signaling is IOBUFDS.  For Spartan-6 family, see UG615.
 
Do you already have Document Navigator installed?  DocNav is a great tool for finding needed up-to-date information quickly.  You can find links for DocNav and much more here.
 
-- 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.
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4. Do not post a new topic or question on someone else's thread, start a new thread!
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谢谢你们俩..



以下为原文

Thank you both..

谢谢你们俩..
我们代表我们双方欢迎您。
很少有人意识到我们的小秘密已存在多年，但现在可以告诉我...... Gabor和我是双胞胎兄弟，他们在出生时就已经分开了，感谢Xilinx用户论坛，我们已经（终于！）重聚了。
- 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

Thank you both..
 
On behalf of both of us, you are most welcome.
 
Very few people realise our little secret kept over many years, but now it can be told...  Gabor and I are twin brothers who were separated at birth, and thanks to the Xilinx user forums, we have been (finally!) reunited.
 
-- 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.

johnkaz77写道：
大家好，我想用一对引脚作为LVDS信号，可以配置为双向吗？
或者我需要一对单独的引脚作为LVDS输入而另一对作为LVDS输出？
双向信号的主要缺点是你需要知道什么时候应该说话，什么时候应该听。
你这样做：
a）像USB一样，你有一个声明的主人在说话，而奴隶只在回应中说话，或者
b）你实现了一个时分复用方案，每个方都有一个可以通话的时隙，否则它会监听。
两者都不是特别简单。
----------------------------是的，我这样做是为了谋生。



以下为原文

johnkaz77 wrote:
Hi everyone, I want to use a single pair of pins for LVDS signal, can it be configured as bidirectional? Or do i need to have a seperate pair of pins as LVDS input and another as LVDS output?

The main disadvantage of the bidirectional signal is that you need to know when it's supposed to talk and when it's supposed to listen. You do this either:
 
a) like USB, where you have a declared master who does the talking, and the slaves talk only in response, or 
 
b) you implement a time-division multiplexing scheme, where each side gets a time slot in which it can talk, otherwise it listens.
 
Neither is particularly simple.
----------------------------Yes, I do this for a living.

嗨再来一次！
关于IOBUFDS原语，我必须使用的I / O标准有什么限制吗？
我在I / O选择资源指南中读到BLVDS标准用于双向LVDS。但仅支持VCCO 2.5V输出，而我只有3.3V



以下为原文

Hi there again! About the IOBUFDS primitive, are there any restrictions on the I/O standard I have to use? I read on the I/O select resources guide that BLVDS standard is used for bidirectional LVDS.But supports only VCCO 2.5V for outputs and i only have 3.3V

有时回答此类问题的最佳方法是制作一个小型测试项目
并尝试一下。
这些工具经过编程，可以了解所有要求，包括
当您阅读用户指南时，有些内容可能不那么明显。
我对S6不像V5那么熟悉，但你可能也想检查是否有Vcco
要求才能使用DIFF_TERM属性。
在V5上，虽然是LVDS_25
输入由VccAux供电，终结器由Vcco供电并且需要
2.5V。
-  Gabor
-  Gabor



以下为原文

Sometimes the best way to answer this type of question is to make a small test project
and just try it out.  The tools are programmed to know all of the requirements, including
some that may not be so apparent when you read through the user guide.
 
I'm not as familiar with S6 as V5, but you might lso want to check if there is a Vcco
requirement in order to use the DIFF_TERM attribute.  On V5, although LVDS_25
inputs are powered by VccAux, the terminators are powered by Vcco and require
2.5V.
 
-- Gabor
-- Gabor