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Everything posted by Fields

  1. Fields

    Arty and Ethernet

    Greetings! I am working with an Arty FPGA board in a personal project that involves the use of a computer and Ethernet to control the FPGA. As a first step, I want to manage the leds by using the computer. Probably a good choice will be to use a Tera Term terminal and manage the state of the leds with sentences like that: · Led 3 state ON · Led 2 state ON · Led 1 state OFF · Led 0 state OFF The problem is that so far I have never connected the FPGA to the computer using Ethernet before. I know that the best way to manage an Et
  2. Greetings! So far I have been working with my Arty (xc7a35ticsg324-1L) to perform some operations and now I am interested in connecting the Arty to the computer to send and to receive data. I have never done it before but I see the Arty has an Ethernet port and a micro USB port, and of course it should be possible to work with both ports but I still have a lot of doubts. What is the best way to connect the Arty to the PC? What would you recommend me to start working on it? Thanks, Field
  3. Greetings! I am very interested in using SERDES to get the maximum speed IO through the FPGA pins. So far I´ve been looking for a good example but I haven´t found anything. Therefore, I´ve decided to start a project of my own. Just for the pleasure of learning. As a first idea I´ve thought to toggle an output signal at a high rate through the pins of the FPGA board. I don´t intend nothing extremely high, I´m just considering 500 MHz, maybe 1GHz. This seems a good point to start using SERDES and learning the basic concepts. But I have to admit, I´m actually confused. As a first s
  4. Impressive! I am also very interested in the maximun switching speed of the Arty board signals, and this post is exactly what I was looking for. @Korken I see you have succesfully forwarded a 100 MHz clock to the output pins. I wonder what would be the limit of the Arty board. Do you think it would be possible to forward a 500 MHz clock to the output pins?
  5. @[email protected], Impressive! That is a great notice, I was really worried about that, but it looks like very different now. By the way, should I worry about the output (and input) impedance between my signal generator and the arty board? The output impedance of my signal generator is 50 ohm, and I can´t find the input impedance of the arty board in the Arty Reference Manual I don´t want to damage the board. Should I be worried about the input impedance of the arty board? Thanks Fields
  6. Thank you both for the advice, At first I was looking for a SMA connector to the FPGA. Actually that is the only reason why I was considering using that PMod to receive the signal, but using it could make my design unnecessarily dificult. I much prefer to wire the clock straight into the port without using the Pmod as @[email protected] suggests. But the Arty board hasn´t any SMA connectors and I need one to receive the clock signal. Is there any way to input the signal straight into the Arty without using a PMod with a SMA connector? Thanks Fields
  7. Greetings! I am using an Arty board (xc7a35ticsg324-1L), and I want to receive an external clock signal which comes from a signal generator. To receive this signal, the Arty board needs a SMA connector, and I recall the Pmod AD5 has two of them: Could the Pmod AD5 be a good choice for my purpose? What would you recommend me? Thanks Fields
  8. Fields

    Arty: Output Frequency

    Thanks, very helpful! The project is going well, but it doesn´t work yet. Xilinx recommends clock forwarding to output a clock from FPGA. This means using an ODDR exactly as your recommendation. I did it for a single-ended clock (10 Mhz) and it works. This is great news but unfortunately differential clocks are very different for me. Firstly I have used the ODDR and the OBUFDS to convert the single-ended clock to differential. In the Arty Master XDC the differential Pmod JB and JC have LVCMOS33 as IOStandard which can only support single-ended. This is perhaps a little co
  9. Fields

    Arty: Output Frequency

    Greetings! I recently bought my first Arty (xc7a35ticsg324-1L), and I’m very interested in output signals at high frequencies. The Arty board includes a single 100 MHz crystal oscillator connected to pin E3. As a first step I want to drive this clock signal to an output pin. Initially I have tried to use the standard Pmod connectors to output the clock signal but It doesn´t work because the max supported frequency is 24 Mhz and I get an output waveform very distorted (the frequency is correct but the shape is not square). Another possibility is to