--- Quote Start ---
Just how disconnected are your ground domains? If they are not connected at all, you will want to AC couple the LVDS signal lines, at least with capacitors, if not a transformer.
--- Quote End ---
I would expect a common ground and also ground connection together with the data lines. Otherwise the said transformer coupling would be necessary to guarantee an input voltage within receiver common mode range. Then you move far away from an easy interface, clock recovery and data resynchronisation from 8b/10b encoded data is supported by dedicated hardware only for gigabit I/O standards. It may be possibly achieved utilizing the DPA block and additional logic, but not easily.
--- Quote Start ---
Do you refer to the Serial Peripheral Interface SPI ? Because it doesn't have a separate frame sync signal?
--- Quote End ---
I've been often using a standard SPI (Motorola defined) interface. The CS acts as sync or frame clock in this case, just a shift register is the basic logic needed for receiver and transmitter.
Honored Contributor
