Communication between Spartan 6 FPGA and Raspberry Pi 3 model B

As far as I know it can't be done,

https://www.raspberrypi.org/magpi/raspberry-pi-3bplus-specs-benchmarks/

The Pi 3 B+ tops out at about 200 Mbits/s.

The Pi4 is a bit faster but can't get near the potential bus speed of Giga bit Ethernet.

Once you have the data in the Pi, what do you expect to do with it ?

The only scheme I have heard of is to use the camera interface but this will take alot of work and need you to write your own drivers.

You would do much better to do some data processing in the FPGA and reduce the rate needed between it and the Pi.

If you want to get an FPGA talking over Ethernet you will need a PHY chip and some FPGA IP in the shape of a MAC and some way of handling the data.

If you explain your project in more detail it might be possible to help more effectively.

MK

Hi,

The main motive of my project is I need to control a device which requires 16 analog input voltages.I want to send this control information from Xilinx Spartan SP605 FPGA which has an ethernet MAC IP provided by Xilinx Logicore.

Hi,

The main motive of my project is I need to control a device which requires 16 analog input voltages.I want to send this control information from Xilinx Spartan SP605 FPGA which has an ethernet MAC IP provided by Xilinx Logicore.

Hi,

That is I need to have fpga talking over ethernet.We are OK with 100 Mbps ethernet connection.

Ok - so you want to send data from FPGA -> PI Ethernet at < 100Mbit/s.

Which FPGA board are you using or will you design your own ?

What data rate do you need to support (ie how fast are you sampling the analogue inputs).

Is it a streaming application ?

Are you using a softcore processor on the FPGA ?

MK

I'm having Xilinx Spartan-6 XC6SLX45T-FGG484-3C FPGA . For sampling the analogue inputs we need around 1 MHz rate.Could you tell me that is it possbile to send ethernet packets from FPGA to Raspberry Pi 3 model b in first place (because I was trying to send ethernet packets between my PC in linux to Raspberry pi,it is not happening)?I will be glad if I get a suitable reply/some example code for raspberry pi to receive ethernet packets and decode information.

With regards,

Nithin Rahav J K

The Spartan chip you refer to can't talk to Ethernet, you need a PHY chip for the interface between the FPGA logic level IO and Ethernet.

Are you using a dev board, if so which one ?

How did you try to connect the PI the PC via Ethernet - normally you would plug both into a switch and try pinging one from the other - does that work.

Sampling the inputs ' around 1MHz' doesn't mean anything - how many channels, how many bits per channel, how many bytes per sample per channel and then how fast will that data be sent: The rate on the wire will be

bytes per sample x number of channels * samples per second and the units will be Mbytes/s

MK

I'm using Spartan SP605 evaluation board which has an ethernet PHY. Regarding that connecting to PC via Ethernet I wasn't aware about the fact that I need to plug both of them to a switch, I'm very new to this area.For sampling, we need 16 channels and 1 byte on every channel.

OK,

Could you explain the context of this project - I'm guessing its a college thing .

Although I've asked several times you have not explained properly what you want to do: we have 16 channels, 8 bits (1 byte) per channel - but we don't know how fast - is it a total (all channels together) of 1M samples per second or 16M samples per second ?

1M samples/s will work over 100Mbit Ethernet, 16M samples/s will not, there is no easy way to get 16Msamples/sec into a Pi3

The Xilinx dev board you have chosen is very complicated and stuffed with parts that are no use to you.

There will be examples on the web (which may help get the Ethernet  working) but you would find life a lot easier with a simple board.

MK

Hi,

For now, could you please tell me how to read ethernet packets(MAC level) in Raspberry Pi.Is there any driver for this thing?As I mentioned before,Xilinx provides an IP which is capable of sending MAC level Ethernet packet.

https://www.xilinx.com/support/documentation/ip_documentation/tri_mode_ethernet_mac/v9_0/pg051-tri-mode-eth-mac.pdf (Ethernet MAC IP).

By putting the right bytes in the first few bytes of the packet, you can turn an Ethernet frame into an UDP packet. Now receiving those packets on Linux becomes easy.

For starters, it would be good practice if you could get sending UDP packets from your Linux PC to the raspberry going. Just as a step in gaining experience with the whole "networking" field.

hello boss


hope your doing well

hope this message finds you in your best interest
I am using a spartan 6 fpga starter kit
my project task is to implement USB nd ethernet protocol using labview but in my board I not ave a ethernet port can I see nd interface the phy chip in my fpga and please help me out with this task

I doubt if I can help you much.

What Spartan 6 board do you have.

Where is Labview running  - do you want to make Labview on a PC talk to the Spartan FPGA via Etherent or USB ?

Can you draw a block diagram which shows how things are connected and which parts you are meant to do.

MK