谁可以提供Spartan E入门套件ADC的链接，DAC STRAIGHT-THROUGH系统picoblaze示例代码?

有些人告诉我，我可能会通过一些PGA设置过载ADC？过载是什么意思？



以下为原文

Some people tell me I may overdrive the ADC with some PGA settings？What does the overdrive mean？

有些人告诉我，我可能会通过一些PGA设置过载ADC？过载是什么意思？
如果PGA增益设置得太高（对于输入范围），则ADC输入的PGA输出将“挂断”为高电平或低电平。
这将使ADC成为一个（缓慢而繁琐的）数字缓冲器。
如果希望PGA和ADC工作在线性（模拟）区域，则需要设置适合PGA输入信号电平的PGA增益值。
这是强制性的“汽车”类比：
如果你的汽车动力转向系统的“放大”过于“大肆宣传”（相当于过度增益），那么每次轻轻推动方向盘都会导致车轮硬左或右转。
将车轮直指前方是非常困难的。
- 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

Some people tell me I may overdrive the ADC with some PGA settings？What does the overdrive mean？

If PGA gain is set too high (for the input range), the PGA output to the ADC input will "peg" either high or low.  This would render the ADC as little more than a (slow and cumbersome) digital buffer.
 
If you want the PGA and ADC to be operating in linear (analogue) region, you need to set PGA gain value which is appropriate for the PGA input signal level.
 
Here's the obligatory "automobile" analogy:

If the "amplification" of your car's power steering system is too "hyped up" (the equivalent of excessive gain), then each gentle nudge of the steering wheel will result in either hard left or hard right turn of the wheels.  It would be very difficult to point the wheels straight ahead.

-- 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.

所有S3E入门套件参考设计（包括A / D和D / A接口）均可从以下链接下载：
http://www.xilinx.com/products/boards/s3estarter/reference_designs.htm
davidsheffield写道：
你好
我正在使用Xilinx Spartan3E入门套件。我可以单独控制ADC和DAC部件，但是我无法将两个模块连接在一起。直通系统不起作用。我想找到类似的代码与我的相比较
但我只是找到了信号发生器的picoblaze代码。我想知道Xilinx是否为ADC和DAC提供了直接通过系统的样本代码。因此我可以从中找到并在我的代码中找到错误。 
或者任何在ADC和DAC直通系统中取得成功的人都可以给我一些建议。 
大卫
干杯，吉姆



以下为原文

All S3E starter kit reference designs including A/D and D/A interfaces can be downloaded from the link below:
 
http://www.xilinx.com/products/boards/s3estarter/reference_designs.htm
 
 

davidsheffield wrote:
Hi
         I am working with the Xilinx Spartan 3E starter kit.And  I can control  the ADC and DAC part seperately ,but I fail to connet two modules together.The straight-through system does not work.I would like to find the similar code to compare with mine.But I just find the signal generator picoblaze code. I wonder whether the Xilinx has provided any sample code for the ADC and DAC straight through system.Therefore I can learn from it and find theerror in my code.
            Or anyone who has succedded in ADC and DAC straight through system can give me some suggestions.
 
                                                                                                                                                                                     David

 
Cheers,
Jim

谢谢。但我想找到一个充足的ADC和DAC系统代码。示例代码只是单个模块。无论如何，谢谢。



以下为原文

Thank you.But I would like to find the a ample code for ADC and DAC system.The sample code is just the individual module.Thank you anyway.

谢谢，我设置增益为-1，输入范围为0.4到2.9.I给出此范围内的信号。还有其他原因导致整个系统不起作用吗？xilinx公司是否试用ADC和
DAC直通系统之前？



以下为原文

Thank you and I set the gain is -1 and input range is 0.4 to 2.9.I give the signal which is in this range.And is there any other causes for the whole system does not work?Does the xilinx company try the ADC and DAC straight-through system before?

谢谢你，我设置的增益是-1，输入范围是0.4到2.9.I给
在这个范围内的信号。还有其他原因
整个系统不起作用？
可能在写入ADC或PGA的设置中存在错误，或者接口逻辑中可能存在错误。
这是两个最可能的问题。
xilinx公司是否尝试使用ADC和DAC
以前的直通系统？
是的，我确信Xilinx会在发货前测试电路板，但Xilinx可能会使用自己的代码而不是客户代码进行测试。
建议：
保存您的设计，暂时搁置一边。
重新加载可从Xilinx网站下载的基准参考设计。
使用参考设计验证您的电路板是否仍按预期工作。
查找参考设计中的设置，必须根据模拟信号输入范围进行更改，并根据需要进行更改。
查看您的模拟输入信号是否可以正确读取。
如果没有，则调整设置值，直到找到有效的值。
关键是从已知良好的工作代码开始，并进行小的更改。
如果您进行更改并且设计不再起作用，并且您不知道在哪里查找导致问题的更改 - 这意味着您进行了太多更改或更改太大。
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。
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 and I set the gain is -1 and input range is 0.4 to 2.9.I give the signal which is in this range.And is there any other causes for the whole system does not work?

Possibly there is an error in either the settings you are writing to the ADC or PGA, or perhaps there is an error in your interface logic.  These are the two most likely problems.

Does the xilinx company try the ADC and DAC straight-through system before?

Yes, I'm sure Xilinx does test the boards before they are shipped, but Xilinx probably uses their own code -- rather than customer code -- for testing.
 
Suggestion:

• Save your design and set it aside, for now.
  
• Re-load the base reference design which is available for download from the Xilinx website.
  
• Verify that your board still works as expected with the reference design.
  
• Find the settings in the reference design which must be changed to suit your analogue signal input range, and change them as needed.
  
• See if your analogue input signal can be read properly.  If not, then adjust the settings values until you find ones which work.
  

A key is to start with known good working code, and make small changes.  If you make changes and the design no longer functions, and you don't know where to look for the change which caused the problem -- this means you made too many changes or the changes were too big.
 
Good luck.
 
-- 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。我想问你一个问题，SPI for Spartan 3e是菊花链配置还是并行配置？我谷歌吧，答案是它是一个并行雏菊配置。这是一个太模糊的答案，我想要
得到官方的答复。



以下为原文

Thank you.And I want to ask you a question the SPI for Spartan 3e is the daisy chain configuration or parallel configuration?I google it ,the answer is that it is a paralle daisy configuration.it is a  too obscure answer and  I want to get the official reply.

用于Spartan 3e的SPI是菊花链配置还是并行配置？
你的意思是串行与并行配置？
请参见电路板原理图第6页和第12页（电路板用户指南的第143和155页）。
SPI闪存（IC14或IC15）使用SPI（主串行）模式加载FPGA。
平台闪存（IC11或IC13）使用主串行模式加载FPGA。
StrataFlash（IC22）使用BPI（主并行）模式加载FPGA。
该信息很好地总结在电路板用户指南的第25页。
您应阅读配置用户指南（UG332）以了解配置条款和模式。
- 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 SPI for Spartan 3e is the daisy chain configuration or parallel configuration?

Do you mean serial vs. parallel configuration?
 
See board schematic page 6 and 12 (pages 143 and 155 of the board user guide).
 
The SPI flash (IC14 or IC15) loads the FPGA using SPI (master serial) mode.
The Platform flash (IC11 or IC13) loads the FPGA using master serial mode.
The StrataFlash (IC22) loads the FPGA using BPI (master parallel) mode.
 
This information is nicely summarised on page 25 of the board user guide.
 
You should read the Configuration User Guide (UG332) to learn the configuration terms and modes.
 
-- 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.