RCM 4010 Question

Hi ,

I am developing something based on this
http://www.ethernut.de/en/documents/webradio.html
using an RCM 4010 prototyping board .

This article mentions the use of segmented buffer to directly forward the internet stream which can be further outputted to an MP3 decoder.

Is there any documentation available on this ?
Also will be great if someone could delve on how this buffer could be translated to I/O ( Hardware aspect) .

Thanks in advance