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
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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:
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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.