Okay - I've just taken a brief look onto the Seiko-Web-Site.

unfortunately I've found the following:

1. Does the iChip S-7600A support Ethernet (802.3) applications?
Ans: The iChip is optimized for dial-up PPP applications. Ethernet 802.3 requires
a different set of protocols.

2. Does the iChip S-7600A require support ICs?
Ans: Yes. The iChip S-7600A is designed to interface between a low cost microcontroller
and some physical layer interface (e.g., external modem).
Note that the socket memory required for TCP/IP is contained inside the S-7600A,
so no external memory is needed.

Bad - I've got also an Idea for something where I need a 10baseT ...

AKKU