Spartan-3AN上的配置引脚使用情况

luisf.rossi写道：
我当然可以肯定，选择和风险都是我的。
我最终在所有M [2：0]线和V [1]线上添加了电阻。
我将V [0]和V [2]连接到VCC。
在这些特定引脚附近，我没有额外的空间来容纳更多2个电阻。
我相信我不会有任何问题，但如果我这样做，我可能会感谢很多你告诉我这样做的人。
无论如何，任何进一步的评论？
当然这是一个论坛，没有人有任何义务给我提示，但当我开始这个主题时，我正在寻找的是一些知道问题，我可能会在运行这个特定的配置时找到。
在另一篇文章中，我收到了延迟我的PROG_B的提示，以确保spartan-3AN的prorpoer供电和配置。
这只是经验和技术诀窍可以给你的东西。
而且可能你们所有人都拥有与我相比的光年经验，可能你们知道大多数已知的问题。
谢谢!!谢谢!!
FWIW，因为我的大部分设计都只使用一种配置（对于V4，从Xilinx配置EPROM进行主串行读取;对于S3AN，使用内部SPI EEPROM），我只需将配置引脚连接到相应的轨道即可。
添加跳线或上拉或其他“允许”的配置选项不存在没有任何意义。
----------------------------是的，我这样做是为了谋生。
在原帖中查看解决方案



以下为原文

luisf.rossi wrote:
For sure i am, and the choices and risks are all mine. I ended up adding resistors to all M[2:0] lines and to V[1] line. I tied V[0] and V[2] to VCC. I have no extra space for more 2 resistors near these specific pins. I belive i won't have any problems, but if i do i will probably thank a lot you guys for telling me to do so. Any way, any further comment? Of course it is a forum and no one have any obligation on giving me tips, but when i started this topic what i as looking for is for some know issue i might find when running this specific cinfiguration. On another post i received the tip to delay my PROG_B to ensure prorpoer powering and configuration of the Spartan-3AN. That is something that just experience and know-how can give you. And as probably all of you guys got light-years of experience compared to me, probably you know most of the known issues. Any way thank you!!
 
 

FWIW, since most of my designs use exactly one type of configuration (for V4, master serial reading from a Xilinx config EPROM; for S3AN, using the internal SPI EEPROM), I just tie the configuration pins to the appropriate rail and that's that. Adding jumpers or pullups or such to "allow" for a configuration option which doesn't exist doesn't make any sense.
----------------------------Yes, I do this for a living.View solution in original post

l.r，直接连接引脚意味着如果你改变主意，就不可能进行调试或故障排除。
如果你喜欢危险的生活，无论如何要系好它们。
如果你想过一个不那么有压力的生活，可以使用上拉或下拉电阻。你不需要任何与JTAG线串联的电阻（除非你真的喜欢电阻，原因有些奇怪。你为什么要问？）。如果你
不关心INIT_b上发生了什么，让它保持不连接状态。
我会把它绑在一个可以测量的测试点上。
如果你没有将它系在可以接触的地方，那么你将不得不忍受在它们不工作时无法对电路板进行故障排除的后果（由于焊料飞溅，坏的电路板，开放的焊点......
）。
Austin Lesea主要工程师Xilinx San Jose



以下为原文

l.r,

Directly connecting pins means if you change your mind, debug or trouble-shooting is not possible. If you like living dangerously, tie them anyway you like. If you wish to live a less stressful life, use pull up or pull down resistors.

You do not need any resistors in series with your JTAG lines (unless you really like resistors for some odd reason. Why do you ask?).

If you do not care what happens on INIT_b, leave it unconnected. I would tie it to a test point that could be measured. If you do not tie it somewhere accessible, then you will have to live with the consequences of not being able to trouble-shoot the boards when they do not work (due to a solder splash, bad pcb, open solder joint....).




Austin Lesea
Principal Engineer
Xilinx San Jose

考虑到我没有任何外部闪存，我如何在M [2：0]和VS [2：0]引脚上进行任何故障排除？
我认为内部闪存可以达到50mhz所以我不应该担心。
我可以从一些仅输入引脚获得什么样的信息？
我以一般的方式理解你的观点，但你能否给我这些特定针脚的任何好理由？
INIT_B的一个测试点是一个好主意..我将使用它。
串联电阻是因为它们需要标准的Spartan-3器件，所以即使考虑到电压电平相同，它们也可能推荐在Spartan-3AN上使用。
谢谢！
J-TAG线上的上拉电阻怎么样？
对此有何评论？



以下为原文

Considering that i won't have any external flash memory, how would i trouble-shoot anything at the M[2:0] and VS[2:0] pins?
 
I consider that internal flash can work up to 50mhz so i should not worry about that.
 
What sort of information can i get of some input-only pins?
 
I understand your point of view in a general way, but can you give me any good reason for these specific pins?
 
A test-point at INIT_B is a good idea.. i will use that.
 
The series resistors is becouse on standard Spartan-3 devices they are needed, so maybe they are also recommended on Spartan-3AN, even considering that the voltage levels will be the same. 
 
Thank you!
 
How about the pull-up resistors on J-TAG line. Any comments on that?

Luisf，
您提出这些问题的事实意味着您不确定答案。
您可能忽略了什么风险，并且需要在原型板上添加上拉电阻或探针点？
你愿意接受这种风险吗？
如果你完全确定你已经完成了所有事情，你为什么要发布这样的问题？
这些组件的额外组件和布局时间的成本是多少，以允许您可能忽略的任何意外事件？
知道您可以快速轻松地应对任何错误或疏忽，您会睡得更好吗？
您是风险承担者还是风险承担者？
在这种情况下，避免风险的成本（额外的上拉/下拉Rs）非常小。
将各种配置引脚直接连接到GND / VCC或完全依赖内部上拉电阻的优势非常小 - 您的设计不会运行得更快或销售更多单元。
一旦您证明了自己的设计，就可以更加轻松地从设计中删除额外的组件。
就个人而言，我更倾向于冒险从利润和销售方面获得回报，并避免在没有或没有优势的情况下风险。
- 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。
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以下为原文

Luisf,
 
The very fact that you are asking these questions means that you aren't certain of the answers.
 
What is the risk that you might have overlooked something, and you will need to add pullup resistors or probe points to your prototype boards?  Are you willing to accept that risk?  If you are absolutely certain that you have done everything correctly, why are you posting such questions?
 
What is the cost of the additional components and layout time for these components to allow for any contingency you might have overlooked?  Will you sleep any better with the knowledge that you can respond to any mistake or oversight quickly and easily?
 
Are you a risk-taker or a risk-avoider?
 
In this case, the cost of avoiding the risk (with additional pullup/pulldown Rs) is very very small.  The advantages of tying various configuration pins directly to GND/VCC, or relying completely on internal pullup resistors, are very small -- your design won't run any faster or sell more units. Once you prove your design, it will be much easier to remove the extra components from your design with complete confidence.
 
Personally, I prefer to take risks where it will pay off in terms of profits and sales, and avoid risks where there is little or no advantage.
 
-- 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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鲍勃，正如我在理解这个想法之前所说的那样，我通常会在可能的情况下遵循。
但我需要一个（即使机会最小）理由这样做。
您是否可以指出我可以改变M [2：0]和V [2：0]引脚值的任何情况？
只有一个可能的情况就足够了。谢谢



以下为原文

Bob, as i told before i understand this idea, and i usually follow that when possible. But i need a single (even if with minimum chance) reason to do so.  Could you point me any situation where i coud take some advantage of changing the M[2:0] and V[2:0] pins values? Just a single possible situation would be enough.

Thank you

但我需要一个（即使机会最小）理由这样做。
这就是我使用的原因：
我是人，我犯了错误，我可能忽略了一些东西。
所以我非常小心，避免任何不必要的风险，这可能会减慢项目速度。
这个原因每次都有效。
我很幸运，我的经理（包括我）一直尊重产品设计的这种方法（谦虚）。
- 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

But i need a single (even if with minimum chance) reason to do so.
 
Here's the reason I use:
I'm human, I make mistakes, and I may have overlooked something.  So I'm being super careful and avoiding any unnecessary risk which could slow down the project.
 
This reason works every time.  I'm fortunate that my managers (including me) have always respected this approach (humility) to product design.
 
-- 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.

请不要以为我是傲慢的。
我理解，在我怀疑时，我应该为易于解决方法留下一些替代方案。
我在这个特定的板上得到了很多。
但要这样做，我必须假设有可能出现问题。
据我所知，M [2：0]引脚定义非常好，如果我想从内部闪存配置我的设备，我应该使用以下配置：0：1：1。
考虑到我很确定我想使用内置闪存，这里可能出现什么问题？谨慎总是好的，但总有一些理由需要。
无论如何，我必须在设计的每一个引脚上留下跳线。
它没有任何成本，但是不实用....在VS引脚上，我可以看到我可以在33Mhz和50Mhz之间进行选择..所以在这里单个电阻可以在某种程度上有用。
但是在模式引脚上...我最初的问题是不相关的，如果这是我应该去的方式，但更多相关，如果有任何技术含义将我的引脚直接连接到电源和GND。
谢谢！



以下为原文

Please do not think i am being arrogant. I understand that on doubts i shoud leave some alternative for easy workarounds. I got a lot of that on this specific board. However to do so, i must assume that there is some chance of something going wrong. As far as i understand, M[2:0] pins are very well defined, and if i want to configure my device from the internal flash i should use the following config : 0:1:1 . Considering that i am pretty sure that i want to use the internal flash, what can go wrong here?

Being cautious is always good, but some reason is always needed. Otherway i would have to leave jumpers on every single pin of my design. It does not cost anything, but is not practical....

On the VS pins i can see that i could chose between 33Mhz and 50Mhz.. so a single resistor can be somehow useful here.

But on the Mode pins...

My initial question was not related if that is the way i should go, but more related if there is any techincal implication on tie my pins directly to power and GND.

Thank you!

请不要以为我是傲慢的。
傲慢的男人不会征求意见或接受建议。
你并不傲慢，你应该得到尊重。
- 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

Please do not think i am being arrogant.
 
An arrogant man doesn't ask for advice or accept advice.  You are not arrogant, and you deserve respect for that.
 
-- 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.

“任何技术含义都将我的引脚直接连接到电源和GND。”正如鲍勃指出的那样，这与风险有关。
许多人称之为“技术风险”，具有时间尺度的影响。
------------------------------------------“如果它不起作用
模拟，它不会在板上工作。“



以下为原文

"any techincal implication on tie my pins directly to power and GND."

As Bob has been pointing out, it is about risk. Many would call it a "technical risk", with timescale implications.
------------------------------------------
"If it don't work in simulation, it won't work on the board."

你没有明白我的观点。
我将把VS作为一个例子。
根据手册，当使用Spartan-3AN内部闪存时，2种可能的配置为：1：0：1和1：1：1。
所以基本上第0位和第2位应该与VCC相关联。
不这样做会降低您的系统可靠性。
如果你留下作为一个例子，你可以做的就是拉下这两条线的可能性就是创造一个可能存在问题的地方。
有人可能错误地在那里焊接一个电阻器，你可能需要10天才能发现问题。
谨慎总是好的，但你必须假设你会有一些潜在的好处。
在这两条线上添加下拉电阻焊盘与在每条VCC线上添加跳线以连接GND相同，以防您误读数据集。
这不是最聪明的解决方法。
双重检查数据集是正确的选择......这同样适用于我的情况。
我有一块带有Spartan-3AN的电路板，没有外接闪光灯。
所以我的选择是从内部闪存启动，或者以某种从模式（或J-tag模式）启动，然后等待J-Tag对系统进行编程。
在设计上添加任何额外的启动配置可能性是一个可能存在问题的地点而没有任何好处。
再次..有人可能错误地配置启动跳线，并疯狂寻找一些额外的问题。
在我看来，增加跳线将是一个风险......减少可能性将是一个风险较小的情况......
所以你能指出我可以从这些跳线中获益的任何情况吗？第二，如果我决定将引脚连接到GND或VCC。
考虑到引脚有一些内部上拉（实际上是所有引脚），最好真的与VCC绑定或者只是让上拉工作吗？
谢谢！



以下为原文

You are not getting my point. I will take VS as an example. According to the manual, when using the Spartan-3AN internal flash the 2 possible configurations are : 1:0:1 and 1:1:1 . So basically bits 0 and 2 should be tied to VCC. Not doing so is making your system less reliable. If you leave as an example, the possibility to pull down these two lines all you are doing is creating a possible problematic spot. Someone can wrongly solder a resistor there and you can take 10 days to find that problem. Being cautious is always good, but you have to assume that you will have some potential benefit. Adding a pull-down resistors pad on these two lines would be the same as adding a jumper on every VCC line to connect GND there in case you have misread the dataset. That would not be the most clever workaround. Double checking the dataset is the right choice here... and the same applies to my situation. I got a board with a Spartan-3AN and no external flash. So my choices are to boot from the internal flash, or to boot at some slave mode (or J-tag mode) and wait to J-Tag to program the system. Adding any extra boot configuration possibility on the design is a possible problematic spot with no benefit. Again.. someone can just wrongly configure the boot jumpers and get crazy looking for some extra problem. In my opinion adding the jumpers would be a risk... reducing the possibilities would be a less risky scenario...

So could you point me any situation where I could possibly take any benefit of these jumpers? 
Second if I decide to tie the pins to GND or VCC. Considering that some o the pins got a internal pull-up (actually all of them), would be better to really tie to VCC or just let the pull-up do its work?

Thank you!

我认为没有任何有用的东西我可以添加到尚未说过的技术讨论中。
您是负责任的设计工程师，因此您对自己的设计有最终决定权。
没有无风险，愚蠢的选择。
所以做出决定，然后继续讨论下一个问题。
如果出现问题，您只需处理出现的问题。
- 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

I don't think there is anything useful I can add to the technical discussion that hasn't already been said.
 
You are the responsible design engineer, so you have the final say with your design.  There is no risk-free, idiot-proof option.  So make your decisions, and move on to the next problem.  If something goes wrong, you'll simply deal with the problems as they arise.
 
-- 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.

我当然可以肯定，选择和风险都是我的。
我最终在所有M [2：0]线和V [1]线上添加了电阻。
我将V [0]和V [2]连接到VCC。
在这些特定引脚附近，我没有额外的空间来容纳更多2个电阻。
我相信我不会有任何问题，但如果我这样做，我可能会感谢很多你告诉我这样做的人。
无论如何，任何进一步的评论？
当然这是一个论坛，没有人有任何义务给我提示，但当我开始这个主题时，我正在寻找的是一些知道问题，我可能会在运行这个特定的配置时找到。
在另一篇文章中，我收到了延迟我的PROG_B的提示，以确保spartan-3AN的prorpoer供电和配置。
这只是经验和技术诀窍可以给你的东西。
而且可能你们所有人都拥有与我相比的光年经验，可能你们知道大多数已知的问题。
谢谢!!谢谢!!



以下为原文

For sure i am, and the choices and risks are all mine. I ended up adding resistors to all M[2:0] lines and to V[1] line. I tied V[0] and V[2] to VCC. I have no extra space for more 2 resistors near these specific pins. I belive i won't have any problems, but if i do i will probably thank a lot you guys for telling me to do so. Any way, any further comment? Of course it is a forum and no one have any obligation on giving me tips, but when i started this topic what i as looking for is for some know issue i might find when running this specific cinfiguration. On another post i received the tip to delay my PROG_B to ensure prorpoer powering and configuration of the Spartan-3AN. That is something that just experience and know-how can give you. And as probably all of you guys got light-years of experience compared to me, probably you know most of the known issues. Any way thank you!!
 
 

luisf.rossi写道：
我当然可以肯定，选择和风险都是我的。
我最终在所有M [2：0]线和V [1]线上添加了电阻。
我将V [0]和V [2]连接到VCC。
在这些特定引脚附近，我没有额外的空间来容纳更多2个电阻。
我相信我不会有任何问题，但如果我这样做，我可能会感谢很多你告诉我这样做的人。
无论如何，任何进一步的评论？
当然这是一个论坛，没有人有任何义务给我提示，但当我开始这个主题时，我正在寻找的是一些知道问题，我可能会在运行这个特定的配置时找到。
在另一篇文章中，我收到了延迟我的PROG_B的提示，以确保spartan-3AN的prorpoer供电和配置。
这只是经验和技术诀窍可以给你的东西。
而且可能你们所有人都拥有与我相比的光年经验，可能你们知道大多数已知的问题。
谢谢!!谢谢!!
FWIW，因为我的大部分设计都只使用一种配置（对于V4，从Xilinx配置EPROM进行主串行读取;对于S3AN，使用内部SPI EEPROM），我只需将配置引脚连接到相应的轨道即可。
添加跳线或上拉或其他“允许”的配置选项不存在没有任何意义。
----------------------------是的，我这样做是为了谋生。



以下为原文

luisf.rossi wrote:
For sure i am, and the choices and risks are all mine. I ended up adding resistors to all M[2:0] lines and to V[1] line. I tied V[0] and V[2] to VCC. I have no extra space for more 2 resistors near these specific pins. I belive i won't have any problems, but if i do i will probably thank a lot you guys for telling me to do so. Any way, any further comment? Of course it is a forum and no one have any obligation on giving me tips, but when i started this topic what i as looking for is for some know issue i might find when running this specific cinfiguration. On another post i received the tip to delay my PROG_B to ensure prorpoer powering and configuration of the Spartan-3AN. That is something that just experience and know-how can give you. And as probably all of you guys got light-years of experience compared to me, probably you know most of the known issues. Any way thank you!!
 
 

FWIW, since most of my designs use exactly one type of configuration (for V4, master serial reading from a Xilinx config EPROM; for S3AN, using the internal SPI EEPROM), I just tie the configuration pins to the appropriate rail and that's that. Adding jumpers or pullups or such to "allow" for a configuration option which doesn't exist doesn't make any sense.
----------------------------Yes, I do this for a living.

只是最后的反馈。
我确实在我的电路板上放置了0R电阻垫，以防我不得不改变我的设置，但我没有必要这样做..它只是与默认配置完美配合（带快速读取的内部SPI闪存）。
感谢您的帮助。
氰



以下为原文

Just a final feedback. I did place 0R resistors pad on my board in case i had to change my settings, but i had no need to do so.. it just worked perfectly with the default configuration (Internal SPI Flash with Fast Read). Thank you for the help. 
 
Cya