I'm trying to design a custom board with Marvell 88E1111 PHY and I want to connect this board to another board with KS8999 PHY on it. I want to connect two phy sides with capacitive coupling.
The distance between two boards is less than 5 inches and I have no option for using another PHY chip or using a transformer. I have searched through web and found these links:
So I think that capacitive coupling is an option.
Micrel KS8999 supports capacitive coupling [here], but there is no specific data in 88e1111 datasheet about capacitive coupling.
Now my question is:
Is it possible to connect two phy sides?
If yes, how to connect lanes in terms of using series capacitors, pull-up voltage at 88E1111 side and pull-up resistor values?
Thanks in advance