Hello Chris
The datasheet, example code, driver integrated into Microchip TCPIP stack, and other collateral is available from the ZeroG website. ZeroG registration is a simple name, company, email, questionaire. Individual docs are kept up to date at the ZeroG site.
Note, that most of the information is also available by downloading the Microchip TCPIP stack v5.00 from Microchip.
Regards
MW