可以使用pmod端口来获取数字信号输入吗？

@tobitobi你能把我们链接到ADC页面/数据表吗？
假设您使用的ADC类似于MCP3208（8通道，12位，100ksps），那么Pmod端口就可以了。
MCP3208可以执行1Mbps SPI，这很容易在Pmod功能范围内。
SPI在FPGA上特别容易;
它基本上只是一个时钟和一个移位寄存器。
如果你超过50Mbps，那么Pmod可能会成为一个挑战，但50Mbps SPI非常罕见 - 特别是对于相对较慢的ADC。
在原帖中查看解决方案



以下为原文

@tobitobi Can you link us to the ADC page/datasheet?
 
Assuming the ADC you're using is something like the MCP3208 (8-channel, 12-bit, 100ksps) then a Pmod port will be fine. the MCP3208 can do 1Mbps SPI, which is easily within the Pmod capabilities. SPI is especially easy on an FPGA; it's basically just a clock and a shift register.
 
If you go over about 50Mbps then Pmod might become a challenge, but 50Mbps SPI is pretty rare - especially for a relatively slow ADC.
 
 
 
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@tobitobi
您还能告诉我们有关此数字信号的更多信息吗？
它是一个非常低速的信号（例如人类按下开关），还是中速信号（例如SPI总线），还是高速信号（例如HDMI）？
是推挽（例如SPI），漏极开路（例如I2C，开关取决于布局）还是差分（HDMI）？
Pmod端口适用于中低速信号（它们不是真正用于处理高速信号）。
每个引脚提供3.3V和GND引脚，I / O为3.3V（不耐5V  - 从Arduino或AVR施加5V会损坏FPGA）。
对于大多数通用I / O，LVCMOS33 I / O标准可能是一个不错的选择（因为您可能不太关心精确的电压阈值）。



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@tobitobi
 
What more can you tell us about this digital signal? Is it a very low-speed signal (eg. a human pressing a switch), or a medium-speed one (eg. an SPI bus), or a high-speed one (eg. HDMI)? Is it push-pull (eg. SPI), open-drain (eg. I2C, switches depending on layout), or differential (HDMI)?
 
 
The Pmod ports are fine for low to medium speed signals (they're not really built to handle high-speed). Each one provides 3.3V and GND pins, and the I/O is 3.3V (it is not 5V tolerant - applying 5V from an Arduino or an AVR will damage the FPGA). For most general-purpose I/O, the LVCMOS33 I/O standard is likely to be a good bet (since you probably don't care too much about exact voltage thresholds).

@ u4223374
谢谢你的回复。
我想连接外部ADC（串行通信）和精确转换的数据。
ADC的采样速度为100ksps。
它对pmod端口来说太快了吗？
我想要比4更多的模拟数据，所以我不认为Nexys4 DDR中包含的XADC对它有好处。
如果pmod端口不好，你认为我怎么能用外部ADC获得几个模拟数据？
非常感激，
tobibobo



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@u4223374
 
Thank you for replying.
I want to attach external ADCs(serial communication) and acquisite  converted data.
The sampling speed of ADC is 100ksps. Is it too fast for pmod ports?
I want to acquisite more analog data than 4, so I don't think XADC which is included in Nexys4 DDR is good for it.
If pmod ports is bad for it, how do you think I can get several analog data with the external ADC?
 
much appreciated,
tobibobo

嘿tobibobo，
ADC的采样速度为100ksps。
它对pmod端口来说太快了吗？
100ksps意味着介于0.8和2Mbit / s之间，这对于PMOD接口来说没有问题。
最好，
赫伯特
--------------是的，我这样做是为了好玩！



以下为原文

Hey tobibobo,
 
The sampling speed of ADC is 100ksps. Is it too fast for pmod ports?
100ksps means between 0.8 and 2Mbit/s which is no problem for the PMOD interface.
 
Best,
Herbert
--------------    Yes, I do this for fun!

@ u4223374
确切地说，ADC是MCP3208。
如果您不介意的话，我希望您告诉我们有关XADC采样速度能力的链接。
非常感激，
tobibobo



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@u4223374
 
exactly the ADC is MCP3208.
I'd like you to tell me the link about the sampling speed capability of XADC, if you don't mind.
 
much appreciated,
tobibobo
 
 

@tobitobi关于MCP3208的幸运猜测！
如上所述，它在Pmod端口上绝对没问题，并且它的接口非常简单，只需FPGA。
XADC的关键文件是UG480。
采样率最大为1MSPS。



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@tobitobi Lucky guess about the MCP3208! As above, it'll be absolutely fine on a Pmod port, and its interface is extremely simple with an FPGA.
 
The key document for the XADC is UG480. Sampling rate is 1MSPS maximum.

@ u4223374
谢谢，但我想检查一下pmod端口的频率能力。
因为我想将数字数据输入到pmod端口。
非常感激，
tobibobo



以下为原文

@u4223374
 
Thank you, but I want to check the frequency capability of pmod ports.
Because I want to input the digital data to pmod ports.
 
much appreciated, 
tobibobo

没有真正的Pmod功能文档 - 它只取决于Digilent如何设计电路板。
然而，假设他们没有对高速进行任何优化，50MHz通常是相当安全的赌注。
Digilent销售他们声称可以做到16Mbps的Pmod，所以Zybo很容易忍受这个速度（远远快于MCP3208所需要的速度）。



以下为原文

There's not really a document for the Pmod capabilities - it just depends on how Digilent has designed the board. However, 50MHz is normally a fairly safe bet on the assumption that they haven't done any optimization for high speed.
 
Digilent sells a Pmod that they claim can do 16Mbps, so it'd be a good bet that the Zybo can easily tolerate that speed (far faster than the MCP3208 will need).

嘿tobibobo，
我成功地使用Zedboard上的PMOD端口输出720p HDMI，这需要~750MHz的数据速率，因此PMOD端口本身不会成为您用例的限制因素。
希望这澄清，
赫伯特
--------------是的，我这样做是为了好玩！



以下为原文

Hey tobibobo,
 
I successfully used the PMOD ports on a Zedboard to output 720p HDMI, which requires a data rate of ~750MHz, so the PMOD port itself will not be a limiting factor for your usecase.
 
Hope this clarifies,
Herbert
--------------    Yes, I do this for fun!