Hi Looi,
Please find the attached example talkthru code, which can be run on the ADSP-21489 EZ-Kit. In the code SPORT 0,1&2 are configured to work with I2S protocol. You can use this as a reference to develop your application. Also, you can find the ADSP-21489 EZ-Kit manual ( it included schematics as well) in the given link.
http://www.analog.com/static/imported-files/eval_kit_manuals/ADSP-21489_ezboard_man_rev.1.1.pdf
For the SPORT related register reference you can look into the ADSP-214xx Hardware reference manual (page no: 1103 / 1304).
Regards,
Jithul