--- Quote Start ---
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 End ---
The two boards do share a common chassis, but their operating voltages and grounds are generated by separate isolated DC/DC converters. Their grounds are definitely close enough to not require AC coupling on the transmission lines.
--- Quote Start ---
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.
--- Quote End ---
I see, so it's the basic SPI that's used with, say, ADCs and various sensors.
Thanks for the tips.
Honored Contributor
