RCM5700 analog input

How can I make an Differential analog input? In the manual it says that at the pins VINIP+ VININ and VINQP+ VINQN but i can’t find these ports. �How could i get the analog value? �With what functions could I do that?

Though the Rabbit 5000 has analog I/O, in the RCM5700 I understand they are used for the ethernet function and are not easy to access.
To get analog I/O you will probably need an additional A/D chip such as the LTC1859 hooked up to a spare SPI serial port.