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  1. Hi, I think I am having the same issue as others here. While I was programming a custom FT232H based board, I had my HS-2 programmer connected as well - and now it shows up with the same configuration as my custom board. Is there a way to restore my HS-2 programmer? Thanks for any assistance!
  2. @Fields With the measured rising/falling edges of about 1 ns I'd say 500 MHz is going to be a challenge. But it could also be that my scope can't measure that fast (as it is only 500 MHz).
  3. Thank you for the answer, then it is as I suspected. I also noticed that you can force the tool to use a "normal" I/O for clock input by specifying that in the XDC, but it was generally not recommended.
  4. Hi all, I am implementing a simple parallel interface to an FT232H from FTDI to use the 60 MHz 8-bit parallel interface for training VHDL. While doing this a question popped up that I was unable to find answer to, the FT232H delivers a sampling clock to which all signals are synchronous - when sampling signals to this clock does this clock have to be routed to an MRCC pin or not? It seems that MRCC pins should be used for global clocks, but what about sampling clocks? Thanks for any clarification!
  5. No problem, I understand that internal discussions sometimes cannot be shared.
  6. Hi again @jpeyron, Have there been any thoughts / discussions internally yet? I would very much like to know their view on pros / cons / worries. Best regards, Emil
  7. Hi all and Digilent representatives! I am a "long" user of the Cmod A7 and am quite pleased with it, except for the choice of SRAM. And on the side I have been playing with another RAM that is easy to use, delivers better performance (about 200 MB/s for the 3.3v version), and more space (8Mbyes) which would be a really nice update to the Cmod-A7. The new "HyperRAM" (http://www.digikey.com/products/en/integrated-circuits-ics/memory/774?k=hyperram&k=&pkeyword=hyperram&pv142=133&FV=ffe00306%2C1c0011&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&am
  8. Hi again, I have received the board and have tested using the standard 200 ohm series resistors and 33 ohm replacements on a 100 MHz signal. What I did was simply to forward the input 100 MHz clock on the Arty to two output pins, one with the original series resistance on and one with my replacement. This was measured with an 16:1 passive (resistive) probe which presents itself as an load of about 800 ohms (made from an 750 resistor + coax), with a 50 ohm input termination on the scope (the image show 1Meg, this is from another channel). The results, as can be seen in the images,
  9. Thank you for taking the time to check and give a lot of information! What would be the problem with the standard I/O headers on top? 72 MHz is not a high frequency, and taking standard rules of thumb for "when to think RF / impedance" (10x frequency & 1/10 of that wavelength in the medium) gives that any trace under a total length of 5 cm needs no high frequency considerations, this is why I was asking about the capacitance vs resistance. But great that the resistors are easily accessible, then I can reduce them significantly for my purpose. The Arty is in the perfect price/
  10. Hi all, We are looking to use the Arty board for first tests on a machine vision system we are developing, which runs a 72 MHz parallel interface. For ease of testing I was planning to use the Arty board and its I/Os, but I see that it has 200 Ohm series resistors on each pin which will put a limit on the max allowed switching speed. Are there any specifications on the pins when it comes to speed? With 200 Ohms about 5-8 pF is maximum allowed after the resistor for a 72 MHz signal. Else, as I do not have the board yet, are the resistors easy to get to (silkscreen designators for
  11. Thanks for the info! The 80 Ohms are a little difficult, I will have to add some impedance matching resistors but no problem. The camera has 115 Ohm out (due to a design decision) so two 18 Ohm resistors will be enough to get close to matched impedance. I will post some results as soon as I have them!
  12. Thank you! Then I know where to start I am not overly worried about the PMOD itself, I have tried 1.5 GBit/s over a standard 0.1" header and that worked like a charm (though I do not know how good the eye was, but no but errors). Please come back with the length of each pair, it will help me greatly!
  13. Thank you for the support! Best regards, Emil
  14. If you want to learn AXI and how to access the DDR3 memory, I recommend these videos: https://www.youtube.com/user/mamsadegh2/videos Extremely good and well made, perfect for starting with the Zynq!