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I know that High-Speed Data Converter Pro GUI used to capture and analyze the data using the TSW1400EVM allows to save the snippets of data into files. It also allows continuous data capture. However, I would like to know whether it is possible to continuously save the data into a file rather than just displaying the continuously updated data in the GUI?
I need to have access to a raw data acquired using an 8 channel 65 MSPS 14 bit ADC. When using all 8 channels, 1 GB memory of TSW1400EVM would fill up basically within a second, whereas I need to be able to save at least few minutes worth of data.
If TSW1400EVM can't handle this task, I would appreciate if you could suggest any alternative options that could be used for the data acquisition from AFE5808AEVM (comes with an 8 channel 65 MSPS 14 bit ADC and outputs the LVDS data via Samtec connector).
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Thanks for using AFE5808A EVM and TSW1400 EVM.
TSW1400EVM can capture lots of raw data from AFE5808A EVM with high speed as 65MSPS rate
and save them into its memory (every time when you click on "Capture" button on GUI).
You can spec how many raw data you want to save on the GUI.
For example, I want to save 1048576 raw data into the memory.
Then, you can spec how many raw data you want to analyze and show the results on the GUI screen.
For example, I want to analyze 4096 raw data and display the result on the GUI screen.
Therefore Total 256 sets of the 4096 raw data (256 * 4096 = 1048576 raw data) are saved into the memory right now.
Please see the following picture:
And then please run "Capture" button.
Then you can see the GUI save all the 1048576 raw data onto your PC right now:
And then save these huge amount of raw data from your PC into file for you
to do more process purpose as you want.
Note: you can save as CSV file or Binary file.
So when you receive so many sets of the raw data, you can do more process on your computer.
Hope this can help you.
Thank you very much.
In reply to Chen Kung:
Thank you for your response!
Do I understand correctly that the upper limit for the # of samples that can be captured is defined by the amount of on-board memory in TSW1400EVM? Basically, if I am using all 8 channels at 12 bits per sample and the on-board memory is 1 GB, I will be able to capture and save to memory not more than about 83 Msamples per channel?
With 65 MSPS and total memory for just 83 Msamples, my memory would fill up within less than 2 sec, whereas for our application we need to be able to collect the data for at least something like 60 sec, which would be equivalent to 32.2 Gsamples. Do I understand correctly that it is not possible to capture this amount of data using TSW1400EVM?
In reply to Dmitrijs:
How are you?
We understand you want to capture raw data and save them into the memory as much as TSW1400EVM can
at the same as 65MSPS high speed. The speed we have tried and run in our lab is not the issue when the raw data
was captured and saved into the memory. However when the memory is sending all the data through USB to your PC, it may take very long time to finish. This all depends on the USB data transmit speed. How long for this timing cannot be expected.
Last time we showed you one example is to set # samples (per channel) to be 1048576.
Then you can click "Capture" button to capture and save huge amount of data into memory.
Also for your concern, we also tried up to 4194304 on the TSW1400 GUI.
It still works fine. But when we are trying to set even higher value, however the stored data are not correct.
So we know # samples (per channel) for AFE5808A (with 8 channel ADC) to be captured by TSW1400EVM are 4194304 samples/per channel. And then you can save all of the raw data into the file in the PC.
If these data samples are not enough, you can continuously execute the same method and save them into
all the files in your PC after that.
Chuck Smyth, Applications Engineering, HealthTech-Imaging
Please verify post if question is answered.
In reply to csmyth:
Thank you for all this information, Chuck and Chen!
Indeed, if we could chop our data into very small chunks at the high enough rate this could work. Though, for our application we would need to sample for at least 0.01 msec after every 0.1 msec. I suspect the TSW1400EVM should be able to handle this, but there might be a problem with PC hardware. Our HDD has a sustained data transfer rate of 144MB/s and an average latency of 4.16 msec. If I understand correctly, the time it will take to transfer a chunk of data to the memory will be based on these two numbers and the amount of data.(e.g. with 8 channels, 12 bits/sample, 65MSPS, within 0.01 msec we should capture about 0.0624 Mb, which should take 0.05 msec for transfer plus an average delay of about 4 mec).
To make sure that the issue can be solved simply by getting a faster HDD and the USB speed limit will not pose an additional problem, can you let me know what USB standard is supported by the TSW1400EVM?
Also, to setup the repeated data capture in LabView or MatLab, do I need to supply some kind of trigger signal to the TSW1400EVM board or can it be implemented purely using the code?
TSW1400 uses USB 2.0. Repeated capture does not require a trigger, but can accomodate a trigger. The PC and GUI latency will be on the 0.3-1s scale.
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