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Any thoughts about synchronization of 2 Stratix IV GX with the 8 SMA transceivers?
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I use the clkout_sma on one board to send its reference clock to a second board. The transmitters on one board route to receivers on the second board. The receivers start off in lock-to-reference mode, and then switch over to lock-to-data mode to capture the data from the transmitters.
You need to ensure that the transmitter data stream has enough toggles so that the lock-to-data logic at the receivers work. You can use a PRBS sequence at the transmitter to modulate data, and then a PRBS sequence at the receiver to demodulate. When you power-up, you first have to synchronize the PRBS generators between boards, and then enable transmitter data.
Cheers,
Dave
Honored Contributor
