在HS上让HSWAPEN开放是否安全？

除了UG380V1.0第39页上的相关内容之外，我们在S6文档中找不到实际情况。
UG380目前处于v2.4。
UG380中对HSWAPEN的每次引用都说“在整个配置中以有效级别驱动”。
根据UG380表2-7：“此引脚[HSWAPEN]具有内置弱上拉电阻。”
在HS上让HSWAPEN开放是否安全？
还是需要拉高？
这取决于您的应用程序。
您使用的是CSO_B还是FCS_B配置引脚？
对于您的电路板设计而言，所有FPGA I / O引脚都是“浮动”（而不是通过弱上拉拉高），直到配置完成为止？
如果任一答案为“是”，则应将HSWAPEN拉低 - 或者应将上拉/下拉电阻添加到任何FPGA引脚，如果允许“浮动”，可能会导致混乱。
- 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。
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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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以下为原文

We could not find anywhere in the S6 documentation that this is actually the case, other than a related on on page 39 of UG380V1.0.
 
UG380 is now at v2.4.  Every reference to HSWAPEN in UG380 says "Drive at valid level throughout configuration."
 
Per UG380 Table 2-7:  "This pin [HSWAPEN] has a built-in weak pull-up resistor."
 
Is it safe to leave HSWAPEN open on S6?  Or does it need a pull high?
 
This depends on your application.

• Are you using CSO_B or FCS_B configuration pins?
  
• Is it a problem for your board design that all FPGA I/O pins are 'floating' (rather than pulled high with a weak pullup) until configuration is complete?
  

If either answer is 'yes', then HSWAPEN should be pulled LOW -- or you should add pullup/pulldown resistors to any FPGA pins which might cause mayhem if allowed to 'float'.
 
-- 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.View solution in original post

除了UG380V1.0第39页上的相关内容之外，我们在S6文档中找不到实际情况。
UG380目前处于v2.4。
UG380中对HSWAPEN的每次引用都说“在整个配置中以有效级别驱动”。
根据UG380表2-7：“此引脚[HSWAPEN]具有内置弱上拉电阻。”
在HS上让HSWAPEN开放是否安全？
还是需要拉高？
这取决于您的应用程序。
您使用的是CSO_B还是FCS_B配置引脚？
对于您的电路板设计而言，所有FPGA I / O引脚都是“浮动”（而不是通过弱上拉拉高），直到配置完成为止？
如果任一答案为“是”，则应将HSWAPEN拉低 - 或者应将上拉/下拉电阻添加到任何FPGA引脚，如果允许“浮动”，可能会导致混乱。
- 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

We could not find anywhere in the S6 documentation that this is actually the case, other than a related on on page 39 of UG380V1.0.
 
UG380 is now at v2.4.  Every reference to HSWAPEN in UG380 says "Drive at valid level throughout configuration."
 
Per UG380 Table 2-7:  "This pin [HSWAPEN] has a built-in weak pull-up resistor."
 
Is it safe to leave HSWAPEN open on S6?  Or does it need a pull high?
 
This depends on your application.

• Are you using CSO_B or FCS_B configuration pins?
  
• Is it a problem for your board design that all FPGA I/O pins are 'floating' (rather than pulled high with a weak pullup) until configuration is complete?
  

If either answer is 'yes', then HSWAPEN should be pulled LOW -- or you should add pullup/pulldown resistors to any FPGA pins which might cause mayhem if allowed to 'float'.
 
-- 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.