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timestamping inputs to the nanosecond

Former Member

Hi,

I don't know much about FPGAs, but from the information I could gather they can be a great answer to my quest; I think especially the MicroZed could be the magic I'm looking for to implement what I need. Could some of you tell me if it's doable ?

Here are my needs: I have a few inputs (about half a dozen) which are square 1Hz signals, more or less stable. For each signal I need to precisely timestamp its rising edge with respect to a very precise master clock (also 1Hz), down to a nanosecond measurement.

Is it possible to do that with a Zynq ?
Does it leave some "free space" on the FPGA to implement other functions ?

Thanks,
        Xav

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    I cannot comment on how well this will work, but the document you linked spoke about using what seems to be Spartan 6 to accomplish their goals. The Zynq has Series 7 fabric which is faster. It appears they are using some kind of interpolation. That same structure should be able to be implemented in Zynq.  So, Is it possible to implement this, I think yes. I just cannot comment on how well it will work. Based on the difference in fabric, I would think this will work better on the Series 7 hardware, but I have not used such a technique in the Series 7 fabric. I have used something similar in Spartan 3E, but that was quite some time ago.  There is certainly enough clocks to implement this. Fabric resource-wise, I do not think that you will have issues. I think you will probably have a good amount of resources left over. One advantage to using the MicroZed or PicoZed as platforms, you can start your development using the larger parts, then as you get your design worked out, you can migrate down to the smaller parts for cost reduction / production runs. Yet it gives you the flexibility to use the larger platforms to work out your ideas without the need for optimization during development.  Please post back your results!  I think everyone would be interested in seeing what happened!  --Dan
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  • 0
    I cannot comment on how well this will work, but the document you linked spoke about using what seems to be Spartan 6 to accomplish their goals. The Zynq has Series 7 fabric which is faster. It appears they are using some kind of interpolation. That same structure should be able to be implemented in Zynq.  So, Is it possible to implement this, I think yes. I just cannot comment on how well it will work. Based on the difference in fabric, I would think this will work better on the Series 7 hardware, but I have not used such a technique in the Series 7 fabric. I have used something similar in Spartan 3E, but that was quite some time ago.  There is certainly enough clocks to implement this. Fabric resource-wise, I do not think that you will have issues. I think you will probably have a good amount of resources left over. One advantage to using the MicroZed or PicoZed as platforms, you can start your development using the larger parts, then as you get your design worked out, you can migrate down to the smaller parts for cost reduction / production runs. Yet it gives you the flexibility to use the larger platforms to work out your ideas without the need for optimization during development.  Please post back your results!  I think everyone would be interested in seeing what happened!  --Dan
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