Wired communication between two fpga

Thread Starter


Joined Nov 25, 2021
Hello everyone,

First post here, I'll try to detail my issue as much as possible.

So I have two FPGAs, each of them on a different card. Some pinouts communicate via a cable (with a total of 50 pins). The cable is pretty short ( 20 centimeters) and is fully Shielded.

The problem beggins when I try to use a longer cable. The new cable is 1.5 meters long and is separated in 3 parts with two high density connectors. When I measured the overall resistance, it was only 0.6 ohm (where the short cable was 0.4 ohm). So I don't think it is due to a power issues.

Also, I thought about Impedance matching, since I use some alternative signals, but this means I'll have to remodel the PCB.

So I was wondering if there are any options in the VHDL code that is meant to be used for long cable communication.

I'm sorry if it's a bit messy I tried to make it as clear as possible.
Thank in advance