Spartan-3A或6部分可以直接驱动lan变压器吗？

不，您需要一个以太网PHY。
以太网PHY比简单的信号缓冲器或驱动器要多得多。
此外，您无法随机选择PHY，磁性（变压器）和RJ45连接器。
必须选择它们才能很好地协同工作。
PHY制造商将帮助您选择磁性和RJ45特性。
- 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。
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你读过手册了吗？
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以下为原文

No, you will need an ethernet PHY.  There is much more to an ethernet PHY than simple signal buffers or drivers.
 
Furthermore, you cannot select a PHY, magnetics (transformer) and RJ45 connector at random.  They must be selected to work well together.  The PHY manufacturer will help you select magnetics and RJ45 characteristics.
 
- 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.

Jeff，您可以选择单端IO的驱动器级别，或者您可以使用电阻器来阻抗匹配，衰减，电平调整，差分io对驱动器到变压器。如果您正确地完成所有工程，您现在拥有
从A点到B点的非标准链接。在B点（接收端），您可以再次匹配事物，并获得另一个LVDS输入对。
很多工作。更容易使用一套标准的组件和设备，除非你必须做一些非常便宜的事情。让我们知道你是否能让它工作，
Austin Lesea主要工程师Xilinx San Jose



以下为原文

Jeff,

You can select the driver level of single ended IO, or you can use resistors to impedance match, attenuate, of level adjust, the drive of a differential io pair to the transformer.

If you do all the engineering correctly, you now have a non-standard link, from point A to point B.

At point B (the receiving end), you can again match things, and get to perhaps another LVDS input pair.  A lot of work.

Easier to use a standard set of components and devices, unless you have to do something incredibly cheap.

Let us know if you get it to work,

Austin Lesea
Principal Engineer
Xilinx San Jose

杰夫，
在我们告诉您如何设计之前，为什么不告诉我们您要完成的任务。
你的设计要求是什么？
到目前为止，您没有提供太多细节或总体目标。
- 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。
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不要在多个论坛上发布相同的问题。
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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。
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以下为原文

Jeff,
 
Before we tell you how to design, why don't you tell us what you're trying to accomplish.  What are your design requirements?
 
So far, you haven't provided much in the way of details or overall objectives.
 
-- 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.

首先是LVDS信号
驱动电缆，它需要屏蔽电缆，如CAT6用于HDMI。
为什么LVDS需要屏蔽电缆？
或者更好......为什么您的应用需要屏蔽电缆？
屏蔽电缆的成本是否是一个交易破坏者？
Cat5,5e和6均可采用屏蔽或非屏蔽。
Cat6并不意味着屏蔽电缆。
但
变压器耦合只需要CAT5电缆。
为什么是这样？
请解释。
其次，LVDS解决方案可以
不能在某些应用中使用需要信号隔离。
和
变压器呢。
你需要DC隔离吗？
看，如果你想使用变压器......请继续使用变压器。
如果你认为没有变形金刚可以过得更好，那么生活对你来说更简单，对吧？
你的来电。
哎呀，你甚至没有提到一些可能影响你设计的小细节：
什么比特率？
全双工？
半双工？
点对点还是多点/多源？
只是想帮助......
- 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。
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以下为原文

First when the LVDS signals drive cable, it requires shielded cable, like CAT6 for HDMI.

• Why does LVDS require shielded cable?
  
• Or better yet... why does your application require shielded cable?
  
• Is the cost of shielded cable a deal-breaker?
  
• Cat5, 5e, and 6 are all available in shielded or unshielded.  Cat6 does not imply shielded cable.
  

but transformer coupling only need CAT5 cables.

Why is this?  Please explain.

Second, LVDS solution can not be used in some application requires signal isolation. And transformer does.

Do you need DC isolation?
 
Look, if you want to use transformers... go ahead and use transformers.  If you think you can get by without transformers, then life is simpler for you, right?  Your call.
 
Gee, you haven't even mentioned some minor little details which might influence your design:

• What bit rate?
  
• Full duplex?  Half duplex?
  
• Point to point or multi-drop/multi-source?
  

Just trying to help...
 
-- 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.

jeffzhang写道：鲍勃，LVDS一般是很好的解决方案。
但它也有一些限制。
首先，当LVDS信号驱动电缆时，它需要屏蔽电缆，如用于HDMI的CAT6。
不，不是真的，反正CAT6电缆不一定是屏蔽的。
屏蔽可以解决另一个问题。
但变压器耦合只需要CAT5电缆。
其次，LVDS解决方案不能在某些应用中使用，需要信号隔离。
变压器确实如此。
你很困惑。
不同的电缆类别大致表明其带宽能力。
Cat5适用于100Base-T Etherhet;
更高带宽的千兆以太网需要Cat6。
变压器隔离是布线的预期用途，而不是带宽。
例如，如果您想要数百米，则需要变压器隔离，因为驱动器端的接地参考不太可能接近接收端的接地参考。
----------------------------是的，我这样做是为了谋生。



以下为原文

 

jeffzhang wrote:
Bob,

LVDS is good solution generally. But there are also some limitation for it. First when the LVDS signals drive cable, it requires shielded cable, like CAT6 for HDMI.

No, not true, and anyways CAT6 cable isn't necessarily shielded. Shielding sovles a different problem.

but transformer coupling only need CAT5 cables. Second, LVDS solution can not be used in some application requires signal isolation. And transformer does. 

 
You're confused. The different cable categories roughly indicates their bandwidth capabiity. Cat5 is good for 100Base-T Etherhet; the higher-bandwidth Gigabit Ethernet requires Cat6.
 
And transformer isolation is a function of the intended use of the wiring, not the bandwidth. For example, if you want to go hundreds of meters, you want transformer isolation because it's not likely that the ground reference on the drive end will be anywhere near that on the receive end.
----------------------------Yes, I do this for a living.

杰夫，
贝斯曼所写的一切都是正确的。
你需要认识到你还没有理解你正在抛弃的术语。
设计一个“自定义界面”，只需很少的工程理解就是一个错误。
正确设计标准界面非常具有挑战性，其中大部分规则都是明确规定的。
您可以使用许多标准通信接口。
一旦确定了您的设计要求，就不必花费太多时间来选择满足您需求的标准接口。
- 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。
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以下为原文

Jeff,
 
Everything bassman wrote is correct.  You need to recognise that you do not yet understand the terms you are tossing about.
 
Designing a "custom interface" with so little engineering understanding would be a mistake.  It's challenging enough to properly design a standard interface, where most of the rules are clearly spelled out for you.
 
There are many standard communications interfaces already available to you.  Once you determine what your design requirements are, it shouldn't take much time to select a standard interface which will meet your needs.
 
- 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.

嗨，
也许我没说清楚。
我想说的是，LVDS信号需要屏蔽电缆。
不会影响CAT5或CAT6。
如果使用非屏蔽电缆，则会出现SI和EMI问题。
HDMI是一个很好的例子。
变压器隔离是预期用途的一个功能
布线，而不是带宽。
例如，如果你想要数百个
米，你想要变压器隔离，因为它不太可能
驱动器端的接地参考将在接近该位置的任何地方
收到结束。
我完全同意这一点。
这就是我想要使用变压器的原因。
看待，
杰夫



以下为原文

Hi,
 
Maybe I did not make it clearly. what I want to say is, LVDS signals required shield cable. doesn't mater CAT5 or CAT6.
 
if unshielded cable was used, you will have SI and EMI issue. HDMI is a good eample.
 
 
 
And transformer isolation is a function of the intended use of the wiring, not the bandwidth. For example, if you want to go hundreds of meters, you want transformer isolation because it's not likely that the ground reference on the drive end will be anywhere near that on the receive end.
 
I totally agree with this point. And this is exact reason I want to use transformer.
 
 
Regard,
Jeff

是的，你可以使用变压器。
它有效，我有T恤。
您需要查看从FPGA驱动的信号的I / V电流/相位。 
我使用zobel网络将杆子移动了一下， 
变压器是一个可怕的负载。
也，
如果您连接到外部设备，当您插入大电压尖峰时可能会导致， 
由于dV / dT，它通过变压器 
所以不要忘记fpga输入和输出上的esd保护/电阻。
而且只是一个人， 
变压器不在DC工作.... 
所以你需要编码数据。 
在接收器端你会得到'尖峰'而不是脉冲。
祝你好运



以下为原文

yes you can use transformers.
 
and it works, I've got the T shirt.
 
You need to look at the I / V current / phase of signals driven out of the FPGA.
   I used a zobel network to shift the poles around a bit, 
       a transformer is a horrible load.
 
also, 
 if your conecting to an external device, when you plug in a large voltage spike can be caused,
      which passes through the transformer, due to dV/dT
           so don't forget the esd protection / resistors on fpga inputs and outputs.
 
and just an obvous,
    transformers do not work at DC....
         so you need to encode the data. 
             and at the receiver end you'll get 'spikes' not pulses.
 
good luck
 

jeffzhang写道：
嗨，
也许我没说清楚。
我想说的是，LVDS信号需要屏蔽电缆。
不会影响CAT5或CAT6。
如果使用非屏蔽电缆，则会出现SI和EMI问题。
HDMI是一个很好的例子。
LVDS不需要屏蔽电缆。
为了减轻EMI，你当然希望良好的扭曲，以保持场地包含。
LVDS与其他任何差分信号都有什么不同，比如用于以太网的什么？
----------------------------是的，我这样做是为了谋生。



以下为原文

 

jeffzhang wrote:
Hi,
 
Maybe I did not make it clearly. what I want to say is, LVDS signals required shield cable. doesn't mater CAT5 or CAT6.
 
if unshielded cable was used, you will have SI and EMI issue. HDMI is a good eample.
 
 

LVDS does not require shielded cable. To mitigate EMI you certainly want good twisting so as to keep the field contained.

How is LVDS different from any other differential signaling, like whatever is used for Ethernet?

 
----------------------------Yes, I do this for a living.

杰夫，
你在挖自己一点洞。
你想要一个优化的设计吗？
响应此线程的人员代表了数十年的系统设计经验。
为什么不描述你想要完成的事情（参见我以前的帖子），让我们帮助你。
- 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

Jeff,
 
You're digging yourself a bit of a hole.
 
Do you want an optimal design?  The folks who have responded to this thread represent decades of experience in system design.  Why not describe what you are trying to accomplish (see my previous posts), and let us help you.
 
-- 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.

谢谢！
约翰史密斯博士。
我希望我正确输入你的名字。
你回答了我的问题！
：smileyhappy：
我主要担心的是驱动电流或电压和保护。
很高兴听到你让它发挥作用。
致巴斯曼59，
向您的SI或EMC专家咨询有关LVDS信号的信息。
我不是SI或EMC专家。
我不能告诉你细节。
但事实是，HDMI线缆使用的是双屏蔽线，每对都有自己的屏蔽！
致Bob，
如果我不需要将我的设备连接到以太网，为什么我必须在我的主板上添加一个大的PHY芯片并按照复杂的协议与它连接，并且可能在我的软件中添加笨重的TCP / IP？
正如我之前所说，这是自定义的点对点设计。
速度可能是几百MHz。
如果我可以使用以太网变压器，我可以为定制变压器设计节省一些成本。
世界是多姿多彩的！
它不仅有7种颜色！
：smileywink：
问候，
杰夫



以下为原文

Thank you! Dr. John Smith. I hope I typed your name correctly.
 
You answered my question! :smileyhappy:
 
Driving current or voltage and protection are my major concerns. It is really good to hear you made it works.
 
 
To Bassman59,
 
Ask your SI or EMC expert about LVDS signals. I am not SI or EMC expert. I can not tell you the details. but the fact is, HDMI cable is using DOUBLE shielded cable which each pair has its own shield!
 
 
To Bob,
 
If I don't have to connect my device to Ethernet, why I have to add a big PHY chip on my board and follow the complicate protocol to interface to it, and maybe add bulky TCP/IP in my software too?
 
as I said before, this is custom point to point design. speed could be hundreds MHz. if I can use Ethernet transformer, I can save some cost for customized transformer design.
 
The world is colorful! It is not only 7 colors! :smileywink:
 
Regards,
Jeff

jeffzhang写道：
致巴斯曼59，
向您的SI或EMC专家咨询有关LVDS信号的信息。
我不是SI或EMC专家。
我不能告诉你细节。
但事实是，HDMI线缆使用的是双屏蔽线，每对都有自己的屏蔽！
我的SI和EMC专家是用作嗅探器的频谱分析仪和测试兼容性的FCC人员。
与其他非屏蔽差分信号设置以太网一样，LVDS信号对EMC非常有用。
为什么HDMI会做它的功能？
我不知道。
----------------------------是的，我这样做是为了谋生。



以下为原文

 

jeffzhang wrote: 
To Bassman59,
 
Ask your SI or EMC expert about LVDS signals. I am not SI or EMC expert. I can not tell you the details. but the fact is, HDMI cable is using DOUBLE shielded cable which each pair has its own shield!
 
 

My SI and EMC experts are the spectrum analyzer used as a sniffer and the FCC guy who tests for compatibility.
LVDS signals, like that other unshielded differential signal set-up Ethernet, do very well for EMC.
 
Why HDMI does what it does? I dunno.
 
----------------------------Yes, I do this for a living.

致Bob，
如果我不需要将我的设备连接到以太网，为什么我必须在我的主板上添加一个大的PHY芯片并按照复杂的协议与它连接，并且可能在我的软件中添加笨重的TCP / IP？
正如我之前所说，这是自定义的点对点设计。
速度可能是几百MHz。
如果我可以使用以太网变压器，我可以为定制变压器设计节省一些成本。
如果您考虑使用直接连接到FPGA的变压器100Mbps +，我担心您会感到失望。
John博士写的任何内容都不应让您感到安慰，带变压器的100Mbps设计是满足您需求的最佳解决方案。
如果您想使用变压器运行100Mbps数据速率，那么是的，以太网PHY是一种合理的解决方案（直接连接到FPGA不是一个合理的解决方案）。
如果您需要直流隔离，那么使用差分对的直流阻断电容比使用变压器更好。
祝你好运。
- 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。
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以下为原文

To Bob,
 
If I don't have to connect my device to Ethernet, why I have to add a big PHY chip on my board and follow the complicate protocol to interface to it, and maybe add bulky TCP/IP in my software too?
 
as I said before, this is custom point to point design. speed could be hundreds MHz. if I can use Ethernet transformer, I can save some cost for customized transformer design.

If you are thinking of 100Mbps+ with a transformer connected directly to the FPGA, I'm afraid you will be disappointed.  Nothing Dr. John wrote should give you comfort that a 100Mbps design with a transformer is an optimal solution for your requirements.
 
If you want to run 100Mbps data rates using a transformer, then yes, an ethernet PHY is a reasonable solution (and direct connect to an FPGA is NOT a reasonable solution).  If DC isolation is all that you need, the you would be better off with DC block capacitors on a diff pair than using a transformer.
 
Good luck to you.
 
-- 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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我应该补充一下。
我的设计是连接两个平台，它们之间有10 Kv DC。
必须是双向的，我的一端力量有限。 
否则我会使用光纤。
这很有趣，在插座的末端有10 Kv导致所有有趣的插件效果！
但
正如其他人所说，如果可以的话，大多数事情的一般最佳实践，就是坚持已知的溶剂。
在我对HDMI的限制性体验中，事情就像疯了一样，因为它们是低成本的有线/屏幕。 
请记住，你刚刚解开了我的一根破损的hdmi电缆，付出了很多钱并没有装好电缆。
我想下次我会去找一个更好的供应商，
哦，如果你想要A和B之间的大量数据，并且是孤立的， 
现在，我会看一下支持SerDes的FPGA，
好的电缆，他们火箭。



以下为原文

I should add.
 
the desing I had was to connect two platforms, with 10 Kv DC ish between them.
 
had to be bi directional, and I had limited power at one end.
    else I'd have used Fibre Optics.
 
it was quite fun, having 10 Kv at the end of a socket leads to all interesting plug in effects !
 
but
 
as others say, if you can , general best practise in most things, is to stick to a known sollution.
 
In my limitied experiance of HDMI, the things radiate like mad, because they are low cost cable /screenig.
   mind you having just disected one of my hdmi cable that was broken, paying good money does not garuntee good cables. I guess I'll go to a better supplier next time,
 
Oh, and if you want a lot of data between A and B, and isolated,
   now days I'd look at one of the SerDes enabled FPGA's,
 
down good cable, they rocket.
 
 
 
 

嗨，约翰博士
您使用zobel网络的目的是什么？
是相位补偿还是过滤？
如果你能提供一些细节，我将不胜感激。
问候，
杰夫



以下为原文

Hi Dr. John
 
What is the purpose you use zobel network? Is it for phase compensation or filtering?
 
I'd appreciate if you can provide some details.
 
Regards,
Jeff

好，
相移和滤波， 
不同的域名相同。
它做到了，
看看S paramiters是我必须做的， 
但是您可能会使用现在可用于IO引脚的模拟鼹鼠。



以下为原文

well,
 
phase shift  and filtering, 
    different domains of the same .
 
it does both,
 
look at the S paramiters is what I had to do,
   but you can probable use the simulation moels now available for the IO pins.