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Altera_Forum
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8 years ago

FPGA to SFP

I have designed Cyclone V based FPGA board. But i have connected with Normal IO instead of Transceiver IO. I need to clarify, whether this will work or not. I have attached schematic ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

SFP transceivers are AC coupled (already inside the module). You get only correct output with DC balanced signal, e.g. 8b/10b encoded. If you use LVDS I/O standard with Cyclone 5, add external DC bias for RX.

There are 622 MBPS SFP modules that should work with Cyclone V standard SERDES. 1 GBPS modules are not specified for lower data rates, I presume they'll work at 400 - 600 MBPS as well.

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May I know the difference between Normal IO vs Transceiver IO.

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Gigabit transceivers of GX/GT devices have fast receiver hardware for 614 MBPS to 3.1/6.1 GBPS.