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041064974
Adventurer
Adventurer
4,906 Views
Registered: ‎02-11-2014

Multi-Gigabit-Transceiver (MGT) operating distance

Hello,

 

we want to build a modular system where Xilinx FPGAs (7-series) shall interconnect via their MGTs.

Due to the modular apporach, there will be up to 4 connectors, up to 25cm (10 inch) PCB and up to 15 cm (0.6 inch) Twinax-Cable between the FPGAs.

Connectors, PCB-Traces and Cables are all designed for 100 Ohm differential impedance and high speed (>10Gbit/s) data transmission.

Do you think this will work with up to 12.5GBit/s?

 

In addition, we want to connect 7-series FPGAs to SFP+ modules using the same connection (up to 4 connectors, up to 25cm (10 inch) PCB and up to 15 cm (0.6 inch) Twinax-Cable).

Do you think this will work with up to 12.5GBit/s?

 

Niels

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2 Replies
austin
Scholar
Scholar
4,901 Views
Registered: ‎02-27-2008

04...

 

Don't think:  simulate!

 

It is not a guess.  It is not an art.  You put the Xilinx provided models, with your actual PCB layout, connector models from their manufacturers, along with the cable models from their manufacturer, specify a pattern, and you see an eye pattern.

 

OPEN = error free, OK.

 

CLOSED = errors, bad, will not work.

 

Contact you local field application engineer/MGT specialist for help.  Xilinx and our distributor(s) know exactly what you need to do to be successful.

 

Austin Lesea
Principal Engineer
Xilinx San Jose
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041064974
Adventurer
Adventurer
4,828 Views
Registered: ‎02-11-2014

Austin,

 

thanks for your reply.

I hoped that there are some rules of thumb how many inches of copper and connectos the Xilinx MGTs can deal with.

So I will contact my local FAE and discuss the smiulation topic. Hopefully,  PCB, connector, cable and SFP vendor can provide modles to me.

 

Niels

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