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Forum: FPGA, VHDL & Verilog How to connect two FPGAs and get the speed of 40 Gbit/s


Author: Komo (Guest)
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Hi,
I am interested to connect two FPGAs on my PCB and I want to achieve 40 
Gbit/s data transmision. Any ideas what kind of connection should I use 
to achieve that speed? Maybe someone of you have already done it?

Author: Schlumpf (Guest)
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e.g.
16 lanes of 2,5Gbit/s PCIe

Author: Dennis Restle (Guest)
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which FPGA?
How much knowldege do you have?

Some FPGAs offer serdes blocks which are capable of up to 32Gbit/s per 
link.
But those are complicated and have many requirements regarding routing 
quality.

Author: Schlumpf (Guest)
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Dennis Restle wrote:
> which FPGA?

every FPGA with SERDES >= 2,5GBit/s

Dennis Restle wrote:
> How much knowldege do you have?

probably a litte more than you

Dennis Restle wrote:
> But those are complicated and have many requirements regarding routing
> quality.

You want high-speed as easy as SPI?

What´s yor problem?

Author: Dennis Restle (Guest)
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@Schlumpf
I have no problem, i want to help komo. Either you have a problem to 
distinguish between me and Komo or you see to be very rude.

@Komo
Some more information would be helpfull. But to work with an design 
which processes 40 Gbit/s will bring some surprising difficulties for 
you.

best regards

Author: Schlumpf (Guest)
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Dennis Restle wrote:
> Either you have a problem to
> distinguish between me and Komo

Indeed I believed your reply was from Komo..
Next time I should take more care of the names.. :-) Sorry

Author: Tim (Guest)
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Xilinx offers you FPGAs with high-speed serdes. For 40 gbps (pure net 
rate?) you will currently need multiple lanes. It is useful to pack a 
lightweight protocol core like Aurora on it.

There you can combine 5x 10,3Gbps links and have a nice streaming 
Interface on both sides.

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